diff --git a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/dataflow/LSMBTreeDataflowHelper.java b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/dataflow/LSMBTreeDataflowHelper.java
index 79f48fa..119d6b0 100644
--- a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/dataflow/LSMBTreeDataflowHelper.java
+++ b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/dataflow/LSMBTreeDataflowHelper.java
@@ -24,14 +24,14 @@
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.util.LSMBTreeUtils;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.dataflow.AbstractLSMIndexDataflowHelper;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryFreePageManager;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 
@@ -57,10 +57,10 @@
     public ITreeIndex createIndexInstance() throws HyracksDataException {
         AbstractTreeIndexOperatorDescriptor treeOpDesc = (AbstractTreeIndexOperatorDescriptor) opDesc;
         ITreeIndexMetaDataFrameFactory metaDataFrameFactory = new LIFOMetaDataFrameFactory();
-        IInMemoryBufferCache memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), memPageSize,
-                memNumPages, new TransientFileMapManager());
+        IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                new TransientFileMapManager(), memPageSize, memNumPages);
         IInMemoryFreePageManager memFreePageManager = new InMemoryFreePageManager(memNumPages, metaDataFrameFactory);
-        return LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ctx.getIOManager(), file, opDesc
+        return LSMBTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ctx.getIOManager(), file, opDesc
                 .getStorageManager().getBufferCache(ctx), opDesc.getStorageManager().getFileMapProvider(ctx),
                 treeOpDesc.getTreeIndexTypeTraits(), treeOpDesc.getTreeIndexComparatorFactories(), treeOpDesc
                         .getTreeIndexBloomFilterKeyFields(), bloomFilterFalsePositiveRate, mergePolicy,
diff --git a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTree.java b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTree.java
index 1652f5a..4fb3b1d 100644
--- a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTree.java
+++ b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTree.java
@@ -51,7 +51,6 @@
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOperation;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.MultiComparator;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.tuples.LSMBTreeTupleReference;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponent;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMHarness;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperation;
@@ -64,7 +63,7 @@
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.AbstractLSMIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BlockingIOOperationCallbackWrapper;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMComponentFileReferences;
@@ -89,7 +88,7 @@
     private final ITreeIndexFrameFactory deleteLeafFrameFactory;
     private final IBinaryComparatorFactory[] cmpFactories;
 
-    public LSMBTree(IInMemoryBufferCache memBufferCache, IInMemoryFreePageManager memFreePageManager,
+    public LSMBTree(IVirtualBufferCache virtualBufferCache, IInMemoryFreePageManager memFreePageManager,
             ITreeIndexFrameFactory interiorFrameFactory, ITreeIndexFrameFactory insertLeafFrameFactory,
             ITreeIndexFrameFactory deleteLeafFrameFactory, ILSMIndexFileManager fileManager,
             TreeIndexFactory<BTree> diskBTreeFactory, TreeIndexFactory<BTree> bulkLoadBTreeFactory,
@@ -99,8 +98,8 @@
             ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider) {
         super(memFreePageManager, diskBTreeFactory.getBufferCache(), fileManager, diskFileMapProvider,
                 bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
-        mutableComponent = new LSMBTreeMutableComponent(new BTree(memBufferCache,
-                ((InMemoryBufferCache) memBufferCache).getFileMapProvider(), memFreePageManager, interiorFrameFactory,
+        mutableComponent = new LSMBTreeMutableComponent(new BTree(virtualBufferCache,
+                virtualBufferCache.getFileMapProvider(), memFreePageManager, interiorFrameFactory,
                 insertLeafFrameFactory, cmpFactories, fieldCount, new FileReference(new File("membtree"))),
                 memFreePageManager);
         this.insertLeafFrameFactory = insertLeafFrameFactory;
@@ -127,7 +126,7 @@
             return;
         }
 
-        ((InMemoryBufferCache) mutableComponent.getBTree().getBufferCache()).open();
+        ((IVirtualBufferCache) mutableComponent.getBTree().getBufferCache()).open();
         mutableComponent.getBTree().create();
         mutableComponent.getBTree().activate();
         List<ILSMComponent> immutableComponents = componentsRef.get();
@@ -180,7 +179,7 @@
         }
         mutableComponent.getBTree().deactivate();
         mutableComponent.getBTree().destroy();
-        ((InMemoryBufferCache) mutableComponent.getBTree().getBufferCache()).close();
+        ((IVirtualBufferCache) mutableComponent.getBTree().getBufferCache()).close();
         isActivated = false;
     }
 
@@ -622,8 +621,8 @@
 
     @Override
     public long getMemoryAllocationSize() {
-        InMemoryBufferCache memBufferCache = (InMemoryBufferCache) mutableComponent.getBTree().getBufferCache();
-        return memBufferCache.getNumPages() * memBufferCache.getPageSize();
+        IBufferCache virtualBufferCache = mutableComponent.getBTree().getBufferCache();
+        return virtualBufferCache.getNumPages() * virtualBufferCache.getPageSize();
     }
 
     @Override
diff --git a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeUtils.java b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeUtils.java
index 9033797..c6fc71c 100644
--- a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeUtils.java
+++ b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeUtils.java
@@ -33,12 +33,12 @@
 import edu.uci.ics.hyracks.storage.am.lsm.btree.impls.LSMBTreeFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.tuples.LSMBTreeCopyTupleWriterFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.tuples.LSMBTreeTupleWriterFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BTreeFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.TreeIndexFactory;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
@@ -46,18 +46,18 @@
 
 public class LSMBTreeUtils {
 
-    public static LSMBTree createLSMTree(IInMemoryBufferCache memBufferCache,
+    public static LSMBTree createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] cmpFactories, int[] bloomFilterKeyFields, double bloomFilterFalsePositiveRate,
             ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
             ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider) {
-        return createLSMTree(memBufferCache, memFreePageManager, ioManager, file, diskBufferCache, diskFileMapProvider,
-                typeTraits, cmpFactories, bloomFilterKeyFields, bloomFilterFalsePositiveRate, mergePolicy,
-                opTrackerFactory, ioScheduler, ioOpCallbackProvider, 0);
+        return createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file, diskBufferCache,
+                diskFileMapProvider, typeTraits, cmpFactories, bloomFilterKeyFields, bloomFilterFalsePositiveRate,
+                mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider, 0);
     }
 
-    public static LSMBTree createLSMTree(IInMemoryBufferCache memBufferCache,
+    public static LSMBTree createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] cmpFactories, int[] bloomFilterKeyFields, double bloomFilterFalsePositiveRate,
@@ -90,7 +90,7 @@
         ILSMIndexFileManager fileNameManager = new LSMBTreeFileManager(ioManager, diskFileMapProvider, file,
                 diskBTreeFactory, startIODeviceIndex);
 
-        LSMBTree lsmTree = new LSMBTree(memBufferCache, memFreePageManager, interiorFrameFactory,
+        LSMBTree lsmTree = new LSMBTree(virtualBufferCache, memFreePageManager, interiorFrameFactory,
                 insertLeafFrameFactory, deleteLeafFrameFactory, fileNameManager, diskBTreeFactory,
                 bulkLoadBTreeFactory, bloomFilterFactory, bloomFilterFalsePositiveRate, diskFileMapProvider,
                 typeTraits.length, cmpFactories, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
diff --git a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/api/IVirtualBufferCache.java b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/api/IVirtualBufferCache.java
index ba273e2..0279026 100644
--- a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/api/IVirtualBufferCache.java
+++ b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/api/IVirtualBufferCache.java
@@ -1,7 +1,10 @@
 package edu.uci.ics.hyracks.storage.am.lsm.common.api;
 
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
+import edu.uci.ics.hyracks.storage.common.file.IFileMapManager;
 
 public interface IVirtualBufferCache extends IBufferCache {
     public void open();
+
+    public IFileMapManager getFileMapProvider();
 }
diff --git a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/freepage/DualIndexInMemoryBufferCache.java b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/freepage/DualIndexInMemoryBufferCache.java
deleted file mode 100644
index c24c473..0000000
--- a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/freepage/DualIndexInMemoryBufferCache.java
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Copyright 2009-2010 by The Regents of the University of California
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * you may obtain a copy of the License from
- * 
- *     http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package edu.uci.ics.hyracks.storage.am.lsm.common.freepage;
-
-import java.nio.ByteBuffer;
-
-import edu.uci.ics.hyracks.storage.common.buffercache.ICacheMemoryAllocator;
-import edu.uci.ics.hyracks.storage.common.buffercache.ICachedPage;
-import edu.uci.ics.hyracks.storage.common.file.BufferedFileHandle;
-import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
-
-/**
- * In-memory buffer cache that supports two tree indexes.
- * We assume that the tree indexes have 2 fixed pages, one at index 0 (metadata page), and one at index 1 (root page).
- */
-public class DualIndexInMemoryBufferCache extends InMemoryBufferCache {
-
-    public DualIndexInMemoryBufferCache(ICacheMemoryAllocator allocator, int pageSize, int numPages) {
-        super(allocator, pageSize, numPages, new TransientFileMapManager());
-    }
-
-    @Override
-    public ICachedPage pin(long dpid, boolean newPage) {
-        int pageId = BufferedFileHandle.getPageId(dpid);
-        int fileId = BufferedFileHandle.getFileId(dpid);
-        if (pageId < pages.length) {
-            // Common case: Return regular page.
-            if (pageId == 0 || pageId == 1) {
-                return pages[pageId + 2 * fileId];
-            } else {
-                return pages[pageId];
-            }
-        } else {
-            // Rare case: Return overflow page, possibly expanding overflow
-            // array.
-            synchronized (overflowPages) {
-                int numNewPages = pageId - pages.length - overflowPages.size() + 1;
-                if (numNewPages > 0) {
-                    ByteBuffer[] buffers = allocator.allocate(pageSize, numNewPages);
-                    for (int i = 0; i < numNewPages; i++) {
-                        CachedPage overflowPage = new CachedPage(pages.length + overflowPages.size(), buffers[i]);
-                        overflowPages.add(overflowPage);
-                    }
-                }
-                return overflowPages.get(pageId - pages.length);
-            }
-        }
-    }
-
-}
diff --git a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/freepage/InMemoryBufferCache.java b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/freepage/InMemoryBufferCache.java
deleted file mode 100644
index 66d8ec2..0000000
--- a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/freepage/InMemoryBufferCache.java
+++ /dev/null
@@ -1,206 +0,0 @@
-/*
- * Copyright 2009-2012 by The Regents of the University of California
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * you may obtain a copy of the License from
- * 
- *     http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package edu.uci.ics.hyracks.storage.am.lsm.common.freepage;
-
-import java.nio.ByteBuffer;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.concurrent.locks.ReadWriteLock;
-import java.util.concurrent.locks.ReentrantReadWriteLock;
-
-import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
-import edu.uci.ics.hyracks.api.io.FileReference;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
-import edu.uci.ics.hyracks.storage.common.buffercache.ICacheMemoryAllocator;
-import edu.uci.ics.hyracks.storage.common.buffercache.ICachedPage;
-import edu.uci.ics.hyracks.storage.common.buffercache.ICachedPageInternal;
-import edu.uci.ics.hyracks.storage.common.file.BufferedFileHandle;
-import edu.uci.ics.hyracks.storage.common.file.IFileMapManager;
-import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
-
-public class InMemoryBufferCache implements IInMemoryBufferCache {
-    protected final ICacheMemoryAllocator allocator;
-    protected final IFileMapManager fileMapManager;
-    protected final int pageSize;
-    protected final int numPages;
-    protected final List<CachedPage> overflowPages = new ArrayList<CachedPage>();
-    protected CachedPage[] pages;
-
-    public InMemoryBufferCache(ICacheMemoryAllocator allocator, int pageSize, int numPages,
-            IFileMapManager fileMapManager) {
-        this.allocator = allocator;
-        this.fileMapManager = fileMapManager;
-        this.pageSize = pageSize;
-        this.numPages = numPages;
-    }
-
-    public void open() {
-        pages = new CachedPage[numPages];
-        ByteBuffer[] buffers = allocator.allocate(pageSize, numPages);
-        for (int i = 0; i < buffers.length; ++i) {
-            pages[i] = new CachedPage(i, buffers[i]);
-        }
-    }
-
-    @Override
-    public ICachedPage pin(long dpid, boolean newPage) {
-        int pageId = BufferedFileHandle.getPageId(dpid);
-        if (pageId < pages.length) {
-            // Common case: Return regular page.
-            return pages[pageId];
-        } else {
-            // Rare case: Return overflow page, possibly expanding overflow array.
-            synchronized (overflowPages) {
-                int numNewPages = pageId - pages.length - overflowPages.size() + 1;
-                if (numNewPages > 0) {
-                    ByteBuffer[] buffers = allocator.allocate(pageSize, numNewPages);
-                    for (int i = 0; i < numNewPages; i++) {
-                        CachedPage overflowPage = new CachedPage(pages.length + overflowPages.size(), buffers[i]);
-                        overflowPages.add(overflowPage);
-                    }
-                }
-                return overflowPages.get(pageId - pages.length);
-            }
-        }
-    }
-
-    @Override
-    public ICachedPage tryPin(long dpid) throws HyracksDataException {
-        return pin(dpid, false);
-    }
-
-    @Override
-    public int getPageSize() {
-        return pageSize;
-    }
-
-    @Override
-    public int getNumPages() {
-        return numPages;
-    }
-
-    @Override
-    public ICachedPageInternal getPage(int cpid) {
-        return pages[cpid];
-    }
-
-    public int getNumOverflowPages() {
-        return overflowPages.size();
-    }
-
-    @Override
-    public void createFile(FileReference fileRef) throws HyracksDataException {
-        synchronized (fileMapManager) {
-            fileMapManager.registerFile(fileRef);
-        }
-    }
-
-    @Override
-    public void openFile(int fileId) throws HyracksDataException {
-        // Do nothing.
-    }
-
-    @Override
-    public void closeFile(int fileId) throws HyracksDataException {
-        // Do nothing.
-    }
-
-    @Override
-    public void deleteFile(int fileId, boolean flushDirtyPages) throws HyracksDataException {
-        synchronized (fileMapManager) {
-            fileMapManager.unregisterFile(fileId);
-        }
-    }
-
-    @Override
-    public void unpin(ICachedPage page) throws HyracksDataException {
-        // Do Nothing.
-    }
-
-    @Override
-    public void close() {
-        for (int i = 0; i < numPages; ++i) {
-            pages[i] = null;
-        }
-        overflowPages.clear();
-    }
-
-    public class CachedPage implements ICachedPageInternal {
-        private final int cpid;
-        private final ByteBuffer buffer;
-        private final ReadWriteLock latch;
-
-        public CachedPage(int cpid, ByteBuffer buffer) {
-            this.cpid = cpid;
-            this.buffer = buffer;
-            latch = new ReentrantReadWriteLock(true);
-        }
-
-        @Override
-        public ByteBuffer getBuffer() {
-            return buffer;
-        }
-
-        @Override
-        public Object getReplacementStrategyObject() {
-            // Do nothing.
-            return null;
-        }
-
-        @Override
-        public boolean pinIfGoodVictim() {
-            // Do nothing.
-            return false;
-        }
-
-        @Override
-        public int getCachedPageId() {
-            return cpid;
-        }
-
-        @Override
-        public void acquireReadLatch() {
-            latch.readLock().lock();
-        }
-
-        @Override
-        public void acquireWriteLatch() {
-            latch.writeLock().lock();
-        }
-
-        @Override
-        public void releaseReadLatch() {
-            latch.readLock().unlock();
-        }
-
-        @Override
-        public void releaseWriteLatch() {
-            latch.writeLock().unlock();
-        }
-    }
-
-    @Override
-    public void force(int fileId, boolean metadata) throws HyracksDataException {
-    }
-
-    @Override
-    public void flushDirtyPage(ICachedPage page) throws HyracksDataException {
-    }
-
-    public IFileMapProvider getFileMapProvider() {
-        return fileMapManager;
-    }
-}
diff --git a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java
index db310d6..c8c550c 100644
--- a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java
+++ b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/VirtualBufferCache.java
@@ -247,6 +247,11 @@
         return sb.toString();
     }
 
+    @Override
+    public IFileMapManager getFileMapProvider() {
+        return fileMapManager;
+    }
+
     private static class CacheBucket {
         private final ReentrantLock bucketLock;
         private VirtualPage cachedPage;
diff --git a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/LSMInvertedIndexDataflowHelper.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/LSMInvertedIndexDataflowHelper.java
index c997f9d..10482c5 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/LSMInvertedIndexDataflowHelper.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/LSMInvertedIndexDataflowHelper.java
@@ -22,20 +22,21 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.dataflow.AbstractLSMIndexDataflowHelper;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryFreePageManager;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.impls.LSMInvertedIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.util.InvertedIndexUtils;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
+import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 
 public final class LSMInvertedIndexDataflowHelper extends AbstractLSMIndexDataflowHelper {
 
@@ -60,14 +61,14 @@
         IInvertedIndexOperatorDescriptor invIndexOpDesc = (IInvertedIndexOperatorDescriptor) opDesc;
         try {
             ITreeIndexMetaDataFrameFactory metaDataFrameFactory = new LIFOMetaDataFrameFactory();
-            IInMemoryBufferCache memBufferCache = new DualIndexInMemoryBufferCache(new HeapBufferAllocator(),
-                    memPageSize, memNumPages);
+            IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                    new TransientFileMapManager(), memPageSize, memNumPages);
             IInMemoryFreePageManager memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages,
                     metaDataFrameFactory);
             IBufferCache diskBufferCache = opDesc.getStorageManager().getBufferCache(ctx);
             IFileMapProvider diskFileMapProvider = opDesc.getStorageManager().getFileMapProvider(ctx);
-            LSMInvertedIndex invIndex = InvertedIndexUtils.createLSMInvertedIndex(memBufferCache, memFreePageManager,
-                    diskFileMapProvider, invIndexOpDesc.getInvListsTypeTraits(),
+            LSMInvertedIndex invIndex = InvertedIndexUtils.createLSMInvertedIndex(virtualBufferCache,
+                    memFreePageManager, diskFileMapProvider, invIndexOpDesc.getInvListsTypeTraits(),
                     invIndexOpDesc.getInvListsComparatorFactories(), invIndexOpDesc.getTokenTypeTraits(),
                     invIndexOpDesc.getTokenComparatorFactories(), invIndexOpDesc.getTokenizerFactory(),
                     diskBufferCache, ctx.getIOManager(), file.getFile().getPath(), bloomFilterFalsePositiveRate,
diff --git a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/PartitionedLSMInvertedIndexDataflowHelper.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/PartitionedLSMInvertedIndexDataflowHelper.java
index 9427275..282217e 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/PartitionedLSMInvertedIndexDataflowHelper.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/dataflow/PartitionedLSMInvertedIndexDataflowHelper.java
@@ -22,20 +22,21 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.dataflow.AbstractLSMIndexDataflowHelper;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryFreePageManager;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.impls.PartitionedLSMInvertedIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.util.InvertedIndexUtils;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
+import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 
 public final class PartitionedLSMInvertedIndexDataflowHelper extends AbstractLSMIndexDataflowHelper {
 
@@ -60,18 +61,19 @@
         IInvertedIndexOperatorDescriptor invIndexOpDesc = (IInvertedIndexOperatorDescriptor) opDesc;
         try {
             ITreeIndexMetaDataFrameFactory metaDataFrameFactory = new LIFOMetaDataFrameFactory();
-            IInMemoryBufferCache memBufferCache = new DualIndexInMemoryBufferCache(new HeapBufferAllocator(),
-                    memPageSize, memNumPages);
+            IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                    new TransientFileMapManager(), memPageSize, memNumPages);
             IInMemoryFreePageManager memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages,
                     metaDataFrameFactory);
             IBufferCache diskBufferCache = opDesc.getStorageManager().getBufferCache(ctx);
             IFileMapProvider diskFileMapProvider = opDesc.getStorageManager().getFileMapProvider(ctx);
-            PartitionedLSMInvertedIndex invIndex = InvertedIndexUtils.createPartitionedLSMInvertedIndex(memBufferCache,
-                    memFreePageManager, diskFileMapProvider, invIndexOpDesc.getInvListsTypeTraits(),
-                    invIndexOpDesc.getInvListsComparatorFactories(), invIndexOpDesc.getTokenTypeTraits(),
-                    invIndexOpDesc.getTokenComparatorFactories(), invIndexOpDesc.getTokenizerFactory(),
-                    diskBufferCache, ctx.getIOManager(), file.getFile().getPath(), bloomFilterFalsePositiveRate,
-                    mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider, partition);
+            PartitionedLSMInvertedIndex invIndex = InvertedIndexUtils.createPartitionedLSMInvertedIndex(
+                    virtualBufferCache, memFreePageManager, diskFileMapProvider,
+                    invIndexOpDesc.getInvListsTypeTraits(), invIndexOpDesc.getInvListsComparatorFactories(),
+                    invIndexOpDesc.getTokenTypeTraits(), invIndexOpDesc.getTokenComparatorFactories(),
+                    invIndexOpDesc.getTokenizerFactory(), diskBufferCache, ctx.getIOManager(),
+                    file.getFile().getPath(), bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
+                    ioOpCallbackProvider, partition);
             return invIndex;
         } catch (IndexException e) {
             throw new HyracksDataException(e);
diff --git a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndex.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndex.java
index beb4dc9..21a9c35 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndex.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndex.java
@@ -48,7 +48,6 @@
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOperation;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.MultiComparator;
 import edu.uci.ics.hyracks.storage.am.common.tuples.PermutingTupleReference;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponent;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponentFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperation;
@@ -61,7 +60,7 @@
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.AbstractLSMIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BTreeFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BlockingIOOperationCallbackWrapper;
@@ -95,7 +94,7 @@
     protected final ITypeTraits[] tokenTypeTraits;
     protected final IBinaryComparatorFactory[] tokenCmpFactories;
 
-    public LSMInvertedIndex(IInMemoryBufferCache memBufferCache, IInMemoryFreePageManager memFreePageManager,
+    public LSMInvertedIndex(IVirtualBufferCache virtualBufferCache, IInMemoryFreePageManager memFreePageManager,
             OnDiskInvertedIndexFactory diskInvIndexFactory, BTreeFactory deletedKeysBTreeFactory,
             BloomFilterFactory bloomFilterFactory, double bloomFilterFalsePositiveRate,
             ILSMIndexFileManager fileManager, IFileMapProvider diskFileMapProvider, ITypeTraits[] invListTypeTraits,
@@ -113,10 +112,10 @@
         this.tokenTypeTraits = tokenTypeTraits;
         this.tokenCmpFactories = tokenCmpFactories;
         // Create in-memory component.
-        InMemoryInvertedIndex memInvIndex = createInMemoryInvertedIndex(memBufferCache);
-        BTree deleteKeysBTree = BTreeUtils.createBTree(memBufferCache, memFreePageManager,
-                ((InMemoryBufferCache) memBufferCache).getFileMapProvider(), invListTypeTraits, invListCmpFactories,
-                BTreeLeafFrameType.REGULAR_NSM, new FileReference(new File("membtree")));
+        InMemoryInvertedIndex memInvIndex = createInMemoryInvertedIndex(virtualBufferCache);
+        BTree deleteKeysBTree = BTreeUtils.createBTree(virtualBufferCache, memFreePageManager,
+                ((IVirtualBufferCache) virtualBufferCache).getFileMapProvider(), invListTypeTraits,
+                invListCmpFactories, BTreeLeafFrameType.REGULAR_NSM, new FileReference(new File("membtree")));
         mutableComponent = new LSMInvertedIndexMutableComponent(memInvIndex, deleteKeysBTree, memFreePageManager);
         componentFactory = new LSMInvertedIndexComponentFactory(diskInvIndexFactory, deletedKeysBTreeFactory,
                 bloomFilterFactory);
@@ -140,7 +139,7 @@
         }
         try {
             List<ILSMComponent> immutableComponents = componentsRef.get();
-            ((InMemoryBufferCache) mutableComponent.getInvIndex().getBufferCache()).open();
+            ((IVirtualBufferCache) mutableComponent.getInvIndex().getBufferCache()).open();
             mutableComponent.getInvIndex().create();
             mutableComponent.getInvIndex().activate();
             mutableComponent.getDeletedKeysBTree().create();
@@ -218,7 +217,7 @@
         mutableComponent.getDeletedKeysBTree().deactivate();
         mutableComponent.getInvIndex().destroy();
         mutableComponent.getDeletedKeysBTree().destroy();
-        ((InMemoryBufferCache) mutableComponent.getInvIndex().getBufferCache()).close();
+        ((IVirtualBufferCache) mutableComponent.getInvIndex().getBufferCache()).close();
     }
 
     @Override
@@ -619,9 +618,9 @@
         }
     }
 
-    protected InMemoryInvertedIndex createInMemoryInvertedIndex(IInMemoryBufferCache memBufferCache)
+    protected InMemoryInvertedIndex createInMemoryInvertedIndex(IVirtualBufferCache virtualBufferCache)
             throws IndexException {
-        return InvertedIndexUtils.createInMemoryBTreeInvertedindex(memBufferCache, memFreePageManager,
+        return InvertedIndexUtils.createInMemoryBTreeInvertedindex(virtualBufferCache, memFreePageManager,
                 invListTypeTraits, invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory);
     }
 
@@ -679,8 +678,8 @@
 
     @Override
     public long getMemoryAllocationSize() {
-        InMemoryBufferCache memBufferCache = (InMemoryBufferCache) mutableComponent.getInvIndex().getBufferCache();
-        return memBufferCache.getNumPages() * memBufferCache.getPageSize();
+        IBufferCache virtualBufferCache = mutableComponent.getInvIndex().getBufferCache();
+        return virtualBufferCache.getNumPages() * virtualBufferCache.getPageSize();
     }
 
     @Override
diff --git a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/PartitionedLSMInvertedIndex.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/PartitionedLSMInvertedIndex.java
index a45f729..83acf6c 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/PartitionedLSMInvertedIndex.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/PartitionedLSMInvertedIndex.java
@@ -20,12 +20,12 @@
 import edu.uci.ics.hyracks.storage.am.bloomfilter.impls.BloomFilterFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BTreeFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.inmemory.InMemoryInvertedIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.ondisk.OnDiskInvertedIndexFactory;
@@ -35,7 +35,7 @@
 
 public class PartitionedLSMInvertedIndex extends LSMInvertedIndex {
 
-    public PartitionedLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
+    public PartitionedLSMInvertedIndex(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, OnDiskInvertedIndexFactory diskInvIndexFactory,
             BTreeFactory deletedKeysBTreeFactory, BloomFilterFactory bloomFilterFactory,
             double bloomFilterFalsePositiveRate, ILSMIndexFileManager fileManager,
@@ -45,15 +45,15 @@
             ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
             ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider)
             throws IndexException {
-        super(memBufferCache, memFreePageManager, diskInvIndexFactory, deletedKeysBTreeFactory, bloomFilterFactory,
+        super(virtualBufferCache, memFreePageManager, diskInvIndexFactory, deletedKeysBTreeFactory, bloomFilterFactory,
                 bloomFilterFalsePositiveRate, fileManager, diskFileMapProvider, invListTypeTraits, invListCmpFactories,
                 tokenTypeTraits, tokenCmpFactories, tokenizerFactory, mergePolicy, opTrackerFactory, ioScheduler,
                 ioOpCallbackProvider);
     }
 
-    protected InMemoryInvertedIndex createInMemoryInvertedIndex(IInMemoryBufferCache memBufferCache)
+    protected InMemoryInvertedIndex createInMemoryInvertedIndex(IVirtualBufferCache virtualBufferCache)
             throws IndexException {
-        return InvertedIndexUtils.createPartitionedInMemoryBTreeInvertedindex(memBufferCache, memFreePageManager,
+        return InvertedIndexUtils.createPartitionedInMemoryBTreeInvertedindex(virtualBufferCache, memFreePageManager,
                 invListTypeTraits, invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory);
     }
 
diff --git a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/inmemory/InMemoryInvertedIndex.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/inmemory/InMemoryInvertedIndex.java
index d5a074e..1e40d7f 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/inmemory/InMemoryInvertedIndex.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/inmemory/InMemoryInvertedIndex.java
@@ -36,7 +36,7 @@
 import edu.uci.ics.hyracks.storage.am.common.api.ISearchOperationCallback;
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOperation;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedListCursor;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.tokenizers.IBinaryTokenizerFactory;
@@ -77,7 +77,7 @@
             btreeCmpFactories[tokenTypeTraits.length + i] = invListCmpFactories[i];
         }
         this.btree = BTreeUtils.createBTree(memBufferCache, memFreePageManager,
-                ((InMemoryBufferCache) memBufferCache).getFileMapProvider(), btreeTypeTraits, btreeCmpFactories,
+                ((IVirtualBufferCache) memBufferCache).getFileMapProvider(), btreeTypeTraits, btreeCmpFactories,
                 BTreeLeafFrameType.REGULAR_NSM, memBTreeFile);
     }
 
@@ -145,8 +145,8 @@
 
     @Override
     public long getMemoryAllocationSize() {
-        InMemoryBufferCache memBufferCache = (InMemoryBufferCache) btree.getBufferCache();
-        return memBufferCache.getNumPages() * memBufferCache.getPageSize();
+        IBufferCache virtualBufferCache = btree.getBufferCache();
+        return virtualBufferCache.getNumPages() * virtualBufferCache.getPageSize();
     }
 
     @Override
diff --git a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/InvertedIndexUtils.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/InvertedIndexUtils.java
index a3ff152..907ee59 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/InvertedIndexUtils.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/InvertedIndexUtils.java
@@ -34,11 +34,11 @@
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.common.freepage.LinkedListFreePageManagerFactory;
 import edu.uci.ics.hyracks.storage.am.common.tuples.TypeAwareTupleWriterFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BTreeFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedListBuilder;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IInvertedListBuilderFactory;
@@ -117,7 +117,7 @@
         return deletedKeysBTreeFactory;
     }
 
-    public static LSMInvertedIndex createLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
+    public static LSMInvertedIndex createLSMInvertedIndex(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IFileMapProvider diskFileMapProvider,
             ITypeTraits[] invListTypeTraits, IBinaryComparatorFactory[] invListCmpFactories,
             ITypeTraits[] tokenTypeTraits, IBinaryComparatorFactory[] tokenCmpFactories,
@@ -125,13 +125,13 @@
             String onDiskDir, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
             ILSMIOOperationCallbackProvider ioOpCallbackProvider) throws IndexException {
-        return createLSMInvertedIndex(memBufferCache, memFreePageManager, diskFileMapProvider, invListTypeTraits,
+        return createLSMInvertedIndex(virtualBufferCache, memFreePageManager, diskFileMapProvider, invListTypeTraits,
                 invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory, diskBufferCache, ioManager,
                 onDiskDir, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
                 ioOpCallbackProvider, 0);
     }
 
-    public static LSMInvertedIndex createLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
+    public static LSMInvertedIndex createLSMInvertedIndex(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IFileMapProvider diskFileMapProvider,
             ITypeTraits[] invListTypeTraits, IBinaryComparatorFactory[] invListCmpFactories,
             ITypeTraits[] tokenTypeTraits, IBinaryComparatorFactory[] tokenCmpFactories,
@@ -160,14 +160,14 @@
                 diskFileMapProvider, invListBuilderFactory, invListTypeTraits, invListCmpFactories, tokenTypeTraits,
                 tokenCmpFactories, fileManager);
 
-        LSMInvertedIndex invIndex = new LSMInvertedIndex(memBufferCache, memFreePageManager, invIndexFactory,
+        LSMInvertedIndex invIndex = new LSMInvertedIndex(virtualBufferCache, memFreePageManager, invIndexFactory,
                 deletedKeysBTreeFactory, bloomFilterFactory, bloomFilterFalsePositiveRate, fileManager,
                 diskFileMapProvider, invListTypeTraits, invListCmpFactories, tokenTypeTraits, tokenCmpFactories,
                 tokenizerFactory, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
         return invIndex;
     }
 
-    public static PartitionedLSMInvertedIndex createPartitionedLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
+    public static PartitionedLSMInvertedIndex createPartitionedLSMInvertedIndex(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IFileMapProvider diskFileMapProvider,
             ITypeTraits[] invListTypeTraits, IBinaryComparatorFactory[] invListCmpFactories,
             ITypeTraits[] tokenTypeTraits, IBinaryComparatorFactory[] tokenCmpFactories,
@@ -175,13 +175,13 @@
             String onDiskDir, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
             ILSMIOOperationCallbackProvider ioOpCallbackProvider) throws IndexException {
-        return createPartitionedLSMInvertedIndex(memBufferCache, memFreePageManager, diskFileMapProvider,
+        return createPartitionedLSMInvertedIndex(virtualBufferCache, memFreePageManager, diskFileMapProvider,
                 invListTypeTraits, invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory,
                 diskBufferCache, ioManager, onDiskDir, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory,
                 ioScheduler, ioOpCallbackProvider, 0);
     }
 
-    public static PartitionedLSMInvertedIndex createPartitionedLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
+    public static PartitionedLSMInvertedIndex createPartitionedLSMInvertedIndex(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IFileMapProvider diskFileMapProvider,
             ITypeTraits[] invListTypeTraits, IBinaryComparatorFactory[] invListCmpFactories,
             ITypeTraits[] tokenTypeTraits, IBinaryComparatorFactory[] tokenCmpFactories,
@@ -210,7 +210,7 @@
                 diskBufferCache, diskFileMapProvider, invListBuilderFactory, invListTypeTraits, invListCmpFactories,
                 tokenTypeTraits, tokenCmpFactories, fileManager);
 
-        PartitionedLSMInvertedIndex invIndex = new PartitionedLSMInvertedIndex(memBufferCache, memFreePageManager,
+        PartitionedLSMInvertedIndex invIndex = new PartitionedLSMInvertedIndex(virtualBufferCache, memFreePageManager,
                 invIndexFactory, deletedKeysBTreeFactory, bloomFilterFactory, bloomFilterFalsePositiveRate,
                 fileManager, diskFileMapProvider, invListTypeTraits, invListCmpFactories, tokenTypeTraits,
                 tokenCmpFactories, tokenizerFactory, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java
index 5fcdcea..6cc5e36 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java
@@ -29,18 +29,19 @@
 import edu.uci.ics.hyracks.storage.am.common.dataflow.AbstractTreeIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.dataflow.AbstractLSMIndexDataflowHelper;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryFreePageManager;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.rtree.frames.RTreePolicyType;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
+import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 
 public abstract class AbstractLSMRTreeDataflowHelper extends AbstractLSMIndexDataflowHelper {
 
@@ -79,18 +80,18 @@
     public ITreeIndex createIndexInstance() throws HyracksDataException {
         AbstractTreeIndexOperatorDescriptor treeOpDesc = (AbstractTreeIndexOperatorDescriptor) opDesc;
         ITreeIndexMetaDataFrameFactory metaDataFrameFactory = new LIFOMetaDataFrameFactory();
-        IInMemoryBufferCache memBufferCache = new DualIndexInMemoryBufferCache(new HeapBufferAllocator(), memPageSize,
-                memNumPages);
+        IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                new TransientFileMapManager(), memPageSize, memNumPages);
         IInMemoryFreePageManager memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages,
                 metaDataFrameFactory);
-        return createLSMTree(memBufferCache, memFreePageManager, ctx.getIOManager(), file, opDesc.getStorageManager()
-                .getBufferCache(ctx), opDesc.getStorageManager().getFileMapProvider(ctx),
+        return createLSMTree(virtualBufferCache, memFreePageManager, ctx.getIOManager(), file, opDesc
+                .getStorageManager().getBufferCache(ctx), opDesc.getStorageManager().getFileMapProvider(ctx),
                 treeOpDesc.getTreeIndexTypeTraits(), treeOpDesc.getTreeIndexComparatorFactories(),
                 btreeComparatorFactories, valueProviderFactories, rtreePolicyType, linearizeCmpFactory, partition);
 
     }
 
-    protected abstract ITreeIndex createLSMTree(IInMemoryBufferCache memBufferCache,
+    protected abstract ITreeIndex createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java
index 49e0a23..2fdf3eb 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java
@@ -27,11 +27,11 @@
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
 import edu.uci.ics.hyracks.storage.am.common.api.TreeIndexException;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.utils.LSMRTreeUtils;
 import edu.uci.ics.hyracks.storage.am.rtree.frames.RTreePolicyType;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
@@ -62,17 +62,17 @@
     }
 
     @Override
-    protected ITreeIndex createLSMTree(IInMemoryBufferCache memBufferCache,
+    protected ITreeIndex createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILinearizeComparatorFactory linearizeCmpFactory, int startIODeviceIndex) throws HyracksDataException {
         try {
-            return LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file, diskBufferCache,
-                    diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories, valueProviderFactories,
-                    rtreePolicyType, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
-                    ioOpCallbackProvider, linearizeCmpFactory, startIODeviceIndex);
+            return LSMRTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file,
+                    diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
+                    valueProviderFactories, rtreePolicyType, bloomFilterFalsePositiveRate, mergePolicy,
+                    opTrackerFactory, ioScheduler, ioOpCallbackProvider, linearizeCmpFactory, startIODeviceIndex);
         } catch (TreeIndexException e) {
             throw new HyracksDataException(e);
         }
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java
index d4fac8f..863f5ff 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java
@@ -27,11 +27,11 @@
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
 import edu.uci.ics.hyracks.storage.am.common.api.TreeIndexException;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.utils.LSMRTreeUtils;
 import edu.uci.ics.hyracks.storage.am.rtree.frames.RTreePolicyType;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
@@ -59,15 +59,15 @@
     }
 
     @Override
-    protected ITreeIndex createLSMTree(IInMemoryBufferCache memBufferCache,
+    protected ITreeIndex createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILinearizeComparatorFactory linearizeCmpFactory, int startIODeviceIndex) throws HyracksDataException {
         try {
-            return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(memBufferCache, memFreePageManager, ioManager, file,
-                    diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
+            return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(virtualBufferCache, memFreePageManager, ioManager,
+                    file, diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
                     valueProviderFactories, rtreePolicyType, mergePolicy, opTrackerFactory, ioScheduler,
                     ioOpCallbackProvider, linearizeCmpFactory, startIODeviceIndex);
         } catch (TreeIndexException e) {
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/AbstractLSMRTree.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/AbstractLSMRTree.java
index f62fab1..7090c68 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/AbstractLSMRTree.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/AbstractLSMRTree.java
@@ -38,7 +38,6 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallback;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOperation;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponent;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponentFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
@@ -48,7 +47,7 @@
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.AbstractLSMIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BlockingIOOperationCallbackWrapper;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMComponentFileReferences;
@@ -57,6 +56,7 @@
 import edu.uci.ics.hyracks.storage.am.rtree.api.IRTreeLeafFrame;
 import edu.uci.ics.hyracks.storage.am.rtree.impls.RTree;
 import edu.uci.ics.hyracks.storage.am.rtree.impls.RTree.RTreeAccessor;
+import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
 
 public abstract class AbstractLSMRTree extends AbstractLSMIndex implements ITreeIndex {
@@ -67,7 +67,7 @@
 
     // In-memory components.
     protected final LSMRTreeMutableComponent mutableComponent;
-    protected final IInMemoryBufferCache memBufferCache;
+    protected final IVirtualBufferCache virtualBufferCache;
 
     protected TreeTupleSorter rTreeTupleSorter;
 
@@ -84,7 +84,7 @@
     protected final ITreeIndexFrameFactory rtreeLeafFrameFactory;
     protected final ITreeIndexFrameFactory btreeLeafFrameFactory;
 
-    public AbstractLSMRTree(IInMemoryBufferCache memBufferCache, IInMemoryFreePageManager memFreePageManager,
+    public AbstractLSMRTree(IVirtualBufferCache virtualBufferCache, IInMemoryFreePageManager memFreePageManager,
             ITreeIndexFrameFactory rtreeInteriorFrameFactory, ITreeIndexFrameFactory rtreeLeafFrameFactory,
             ITreeIndexFrameFactory btreeInteriorFrameFactory, ITreeIndexFrameFactory btreeLeafFrameFactory,
             ILSMIndexFileManager fileManager, TreeIndexFactory<RTree> diskRTreeFactory,
@@ -96,14 +96,14 @@
             ILSMIOOperationCallbackProvider ioOpCallbackProvider) {
         super(memFreePageManager, diskRTreeFactory.getBufferCache(), fileManager, diskFileMapProvider,
                 bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
-        RTree memRTree = new RTree(memBufferCache, ((InMemoryBufferCache) memBufferCache).getFileMapProvider(),
+        RTree memRTree = new RTree(virtualBufferCache, ((IVirtualBufferCache) virtualBufferCache).getFileMapProvider(),
                 memFreePageManager, rtreeInteriorFrameFactory, rtreeLeafFrameFactory, rtreeCmpFactories, fieldCount,
                 new FileReference(new File("memrtree")));
-        BTree memBTree = new BTree(memBufferCache, ((InMemoryBufferCache) memBufferCache).getFileMapProvider(),
+        BTree memBTree = new BTree(virtualBufferCache, ((IVirtualBufferCache) virtualBufferCache).getFileMapProvider(),
                 memFreePageManager, btreeInteriorFrameFactory, btreeLeafFrameFactory, btreeCmpFactories, fieldCount,
                 new FileReference(new File("membtree")));
         mutableComponent = new LSMRTreeMutableComponent(memRTree, memBTree, memFreePageManager);
-        this.memBufferCache = memBufferCache;
+        this.virtualBufferCache = virtualBufferCache;
         this.rtreeInteriorFrameFactory = rtreeInteriorFrameFactory;
         this.rtreeLeafFrameFactory = rtreeLeafFrameFactory;
         this.btreeInteriorFrameFactory = btreeInteriorFrameFactory;
@@ -134,7 +134,7 @@
             return;
         }
 
-        ((InMemoryBufferCache) mutableComponent.getRTree().getBufferCache()).open();
+        ((IVirtualBufferCache) mutableComponent.getRTree().getBufferCache()).open();
         mutableComponent.getRTree().create();
         mutableComponent.getBTree().create();
         mutableComponent.getRTree().activate();
@@ -164,7 +164,7 @@
         mutableComponent.getBTree().deactivate();
         mutableComponent.getRTree().destroy();
         mutableComponent.getBTree().destroy();
-        ((InMemoryBufferCache) mutableComponent.getRTree().getBufferCache()).close();
+        ((IVirtualBufferCache) mutableComponent.getRTree().getBufferCache()).close();
     }
 
     @Override
@@ -360,8 +360,8 @@
 
     @Override
     public long getMemoryAllocationSize() {
-        InMemoryBufferCache memBufferCache = (InMemoryBufferCache) mutableComponent.getRTree().getBufferCache();
-        return memBufferCache.getNumPages() * memBufferCache.getPageSize();
+        IBufferCache virtualBufferCache = mutableComponent.getRTree().getBufferCache();
+        return virtualBufferCache.getNumPages() * virtualBufferCache.getPageSize();
     }
 
     @Override
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTree.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTree.java
index 367b387..855d8df 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTree.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTree.java
@@ -44,7 +44,6 @@
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallback;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOperation;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.MultiComparator;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponent;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMHarness;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperation;
@@ -56,6 +55,7 @@
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMComponentFileReferences;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMTreeIndexAccessor;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.TreeIndexFactory;
@@ -67,7 +67,7 @@
 
 public class LSMRTree extends AbstractLSMRTree {
 
-    public LSMRTree(IInMemoryBufferCache memBufferCache, IInMemoryFreePageManager memFreePageManager,
+    public LSMRTree(IVirtualBufferCache virtualBufferCache, IInMemoryFreePageManager memFreePageManager,
             ITreeIndexFrameFactory rtreeInteriorFrameFactory, ITreeIndexFrameFactory rtreeLeafFrameFactory,
             ITreeIndexFrameFactory btreeInteriorFrameFactory, ITreeIndexFrameFactory btreeLeafFrameFactory,
             ILSMIndexFileManager fileNameManager, TreeIndexFactory<RTree> diskRTreeFactory,
@@ -77,7 +77,7 @@
             ILinearizeComparatorFactory linearizer, int[] comparatorFields, IBinaryComparatorFactory[] linearizerArray,
             ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
             ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider) {
-        super(memBufferCache, memFreePageManager, rtreeInteriorFrameFactory, rtreeLeafFrameFactory,
+        super(virtualBufferCache, memFreePageManager, rtreeInteriorFrameFactory, rtreeLeafFrameFactory,
                 btreeInteriorFrameFactory, btreeLeafFrameFactory, fileNameManager, diskRTreeFactory,
                 new LSMRTreeComponentFactory(diskRTreeFactory, diskBTreeFactory, bloomFilterFactory),
                 diskFileMapProvider, fieldCount, rtreeCmpFactories, btreeCmpFactories, linearizer, comparatorFields,
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuples.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuples.java
index a3a8ca2..5858ebb 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuples.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuples.java
@@ -38,7 +38,6 @@
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallback;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOperation;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.MultiComparator;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponent;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMComponentFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMHarness;
@@ -51,6 +50,7 @@
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexOperationContext;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMComponentFileReferences;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.LSMTreeIndexAccessor;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.TreeIndexFactory;
@@ -68,7 +68,7 @@
     // because it should have a different tuple writer in it's leaf frames.
     private final ILSMComponentFactory bulkLoaComponentFactory;
 
-    public LSMRTreeWithAntiMatterTuples(IInMemoryBufferCache memBufferCache,
+    public LSMRTreeWithAntiMatterTuples(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, ITreeIndexFrameFactory rtreeInteriorFrameFactory,
             ITreeIndexFrameFactory rtreeLeafFrameFactory, ITreeIndexFrameFactory btreeInteriorFrameFactory,
             ITreeIndexFrameFactory btreeLeafFrameFactory, ILSMIndexFileManager fileManager,
@@ -78,7 +78,7 @@
             int[] comparatorFields, IBinaryComparatorFactory[] linearizerArray, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
             ILSMIOOperationCallbackProvider ioOpCallbackProvider) {
-        super(memBufferCache, memFreePageManager, rtreeInteriorFrameFactory, rtreeLeafFrameFactory,
+        super(virtualBufferCache, memFreePageManager, rtreeInteriorFrameFactory, rtreeLeafFrameFactory,
                 btreeInteriorFrameFactory, btreeLeafFrameFactory, fileManager, diskRTreeFactory,
                 new LSMRTreeWithAntiMatterTuplesComponentFactory(diskRTreeFactory), diskFileMapProvider, fieldCount,
                 rtreeCmpFactories, btreeCmpFactories, linearizer, comparatorFields, linearizerArray, 0, mergePolicy,
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java
index d6efc34..81feca5 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java
@@ -33,12 +33,12 @@
 import edu.uci.ics.hyracks.storage.am.common.api.TreeIndexException;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.common.freepage.LinkedListFreePageManagerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BTreeFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.TreeIndexFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.impls.LSMRTree;
@@ -60,7 +60,7 @@
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
 
 public class LSMRTreeUtils {
-    public static LSMRTree createLSMTree(IInMemoryBufferCache memBufferCache,
+    public static LSMRTree createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
@@ -69,13 +69,13 @@
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
             ILSMIOOperationCallbackProvider ioOpCallbackProvider, ILinearizeComparatorFactory linearizeCmpFactory)
             throws TreeIndexException {
-        return createLSMTree(memBufferCache, memFreePageManager, ioManager, file, diskBufferCache, diskFileMapProvider,
-                typeTraits, rtreeCmpFactories, btreeCmpFactories, valueProviderFactories, rtreePolicyType,
-                bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider,
-                linearizeCmpFactory, 0);
+        return createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file, diskBufferCache,
+                diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories, valueProviderFactories,
+                rtreePolicyType, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
+                ioOpCallbackProvider, linearizeCmpFactory, 0);
     }
 
-    public static LSMRTree createLSMTree(IInMemoryBufferCache memBufferCache,
+    public static LSMRTree createLSMTree(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
@@ -118,7 +118,7 @@
 
         ILSMIndexFileManager fileNameManager = new LSMRTreeFileManager(ioManager, diskFileMapProvider, file,
                 diskRTreeFactory, diskBTreeFactory, startIODeviceIndex);
-        LSMRTree lsmTree = new LSMRTree(memBufferCache, memFreePageManager, rtreeInteriorFrameFactory,
+        LSMRTree lsmTree = new LSMRTree(virtualBufferCache, memFreePageManager, rtreeInteriorFrameFactory,
                 rtreeLeafFrameFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory, fileNameManager,
                 diskRTreeFactory, diskBTreeFactory, bloomFilterFactory, bloomFilterFalsePositiveRate,
                 diskFileMapProvider, typeTraits.length, rtreeCmpFactories, btreeCmpFactories, linearizeCmpFactory,
@@ -126,26 +126,26 @@
         return lsmTree;
     }
 
-    public static LSMRTreeWithAntiMatterTuples createLSMTreeWithAntiMatterTuples(IInMemoryBufferCache memBufferCache,
-            IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
-            IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
-            IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
-            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
-            ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
+    public static LSMRTreeWithAntiMatterTuples createLSMTreeWithAntiMatterTuples(
+            IVirtualBufferCache virtualBufferCache, IInMemoryFreePageManager memFreePageManager, IIOManager ioManager,
+            FileReference file, IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider,
+            ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
+            IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
+            RTreePolicyType rtreePolicyType, ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
             ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider,
             ILinearizeComparatorFactory linearizerCmpFactory) throws TreeIndexException {
-        return createLSMTreeWithAntiMatterTuples(memBufferCache, memFreePageManager, ioManager, file, diskBufferCache,
-                diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories, valueProviderFactories,
-                rtreePolicyType, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider,
-                linearizerCmpFactory, 0);
+        return createLSMTreeWithAntiMatterTuples(virtualBufferCache, memFreePageManager, ioManager, file,
+                diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
+                valueProviderFactories, rtreePolicyType, mergePolicy, opTrackerFactory, ioScheduler,
+                ioOpCallbackProvider, linearizerCmpFactory, 0);
     }
 
-    public static LSMRTreeWithAntiMatterTuples createLSMTreeWithAntiMatterTuples(IInMemoryBufferCache memBufferCache,
-            IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
-            IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
-            IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
-            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
-            ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
+    public static LSMRTreeWithAntiMatterTuples createLSMTreeWithAntiMatterTuples(
+            IVirtualBufferCache virtualBufferCache, IInMemoryFreePageManager memFreePageManager, IIOManager ioManager,
+            FileReference file, IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider,
+            ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
+            IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
+            RTreePolicyType rtreePolicyType, ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
             ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider,
             ILinearizeComparatorFactory linearizerCmpFactory, int startIODeviceIndex) throws TreeIndexException {
 
@@ -185,7 +185,7 @@
 
         ILSMIndexFileManager fileNameManager = new LSMRTreeWithAntiMatterTuplesFileManager(ioManager,
                 diskFileMapProvider, file, diskRTreeFactory, startIODeviceIndex);
-        LSMRTreeWithAntiMatterTuples lsmTree = new LSMRTreeWithAntiMatterTuples(memBufferCache, memFreePageManager,
+        LSMRTreeWithAntiMatterTuples lsmTree = new LSMRTreeWithAntiMatterTuples(virtualBufferCache, memFreePageManager,
                 rtreeInteriorFrameFactory, rtreeLeafFrameFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory,
                 fileNameManager, diskRTreeFactory, bulkLoadRTreeFactory, diskFileMapProvider, typeTraits.length,
                 rtreeCmpFactories, btreeCmpFactories, linearizerCmpFactory, comparatorFields, linearizerArray,
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeBulkLoadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeBulkLoadTest.java
index 843d200..355dc3b 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeBulkLoadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeBulkLoadTest.java
@@ -51,7 +51,7 @@
     @Override
     protected OrderedIndexTestContext createTestContext(ISerializerDeserializer[] fieldSerdes, int numKeys,
             BTreeLeafFrameType leafType) throws Exception {
-        return LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeDeleteTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeDeleteTest.java
index eb97c56..fd1b5fd 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeDeleteTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeDeleteTest.java
@@ -51,7 +51,7 @@
     @Override
     protected OrderedIndexTestContext createTestContext(ISerializerDeserializer[] fieldSerdes, int numKeys,
             BTreeLeafFrameType leafType) throws Exception {
-        return LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeExamplesTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeExamplesTest.java
index 76972a5..2969046 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeExamplesTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeExamplesTest.java
@@ -34,7 +34,7 @@
     @Override
     protected ITreeIndex createTreeIndex(ITypeTraits[] typeTraits, IBinaryComparatorFactory[] cmpFactories,
             int[] bloomFilterKeyFields) throws TreeIndexException {
-        return LSMBTreeUtils.createLSMTree(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeUtils.createLSMTree(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), typeTraits, cmpFactories, bloomFilterKeyFields,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeInsertTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeInsertTest.java
index d070f23..4944196 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeInsertTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeInsertTest.java
@@ -51,7 +51,7 @@
     @Override
     protected OrderedIndexTestContext createTestContext(ISerializerDeserializer[] fieldSerdes, int numKeys,
             BTreeLeafFrameType leafType) throws Exception {
-        return LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeLifecycleTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeLifecycleTest.java
index 0455c20..108319c 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeLifecycleTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeLifecycleTest.java
@@ -42,7 +42,7 @@
     @Override
     public void setup() throws Exception {
         harness.setUp();
-        testCtx = LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        testCtx = LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, fieldSerdes.length,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMergeTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMergeTest.java
index 76fe0b8..4c76089 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMergeTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMergeTest.java
@@ -50,7 +50,7 @@
     @Override
     protected OrderedIndexTestContext createTestContext(ISerializerDeserializer[] fieldSerdes, int numKeys,
             BTreeLeafFrameType leafType) throws Exception {
-        return LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeModificationOperationCallbackTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeModificationOperationCallbackTest.java
index 8464e9e..3b4f1b3 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeModificationOperationCallbackTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeModificationOperationCallbackTest.java
@@ -42,7 +42,7 @@
 
     @Override
     protected void createIndexInstance() throws Exception {
-        index = LSMBTreeUtils.createLSMTree(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        index = LSMBTreeUtils.createLSMTree(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), SerdeUtils.serdesToTypeTraits(keySerdes),
                 SerdeUtils.serdesToComparatorFactories(keySerdes, keySerdes.length), bloomFilterKeyFields,
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMultiBulkLoadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMultiBulkLoadTest.java
index 3c5060b..5284ce5 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMultiBulkLoadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeMultiBulkLoadTest.java
@@ -52,7 +52,7 @@
     @Override
     protected OrderedIndexTestContext createTestContext(ISerializerDeserializer[] fieldSerdes, int numKeys,
             BTreeLeafFrameType leafType) throws Exception {
-        return LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeSearchOperationCallbackTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeSearchOperationCallbackTest.java
index dd94963..e5f4fa7 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeSearchOperationCallbackTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeSearchOperationCallbackTest.java
@@ -35,7 +35,7 @@
 
     @Override
     protected void createIndexInstance() throws Exception {
-        index = LSMBTreeUtils.createLSMTree(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        index = LSMBTreeUtils.createLSMTree(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), SerdeUtils.serdesToTypeTraits(keySerdes),
                 SerdeUtils.serdesToComparatorFactories(keySerdes, keySerdes.length), bloomFilterKeyFields,
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeUpdateTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeUpdateTest.java
index b19e21e..0351a90 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeUpdateTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/LSMBTreeUpdateTest.java
@@ -51,7 +51,7 @@
     @Override
     protected OrderedIndexTestContext createTestContext(ISerializerDeserializer[] fieldSerdes, int numKeys,
             BTreeLeafFrameType leafType) throws Exception {
-        return LSMBTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/multithread/LSMBTreeMultiThreadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/multithread/LSMBTreeMultiThreadTest.java
index de9fe24..9d3f742 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/multithread/LSMBTreeMultiThreadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/multithread/LSMBTreeMultiThreadTest.java
@@ -50,7 +50,7 @@
     @Override
     protected ITreeIndex createIndex(ITypeTraits[] typeTraits, IBinaryComparatorFactory[] cmpFactories,
             int[] bloomFilterKeyFields) throws TreeIndexException {
-        return LSMBTreeUtils.createLSMTree(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMBTreeUtils.createLSMTree(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), typeTraits, cmpFactories, bloomFilterKeyFields,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/InMemoryBTreeRunner.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/InMemoryBTreeRunner.java
index 1b453b7..204ac2a 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/InMemoryBTreeRunner.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/InMemoryBTreeRunner.java
@@ -37,8 +37,8 @@
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallback;
 import edu.uci.ics.hyracks.storage.am.common.tuples.TypeAwareTupleWriterFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryFreePageManager;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.ICacheMemoryAllocator;
@@ -67,7 +67,7 @@
     protected void init(int pageSize, int numPages, ITypeTraits[] typeTraits, IBinaryComparatorFactory[] cmpFactories)
             throws HyracksDataException, BTreeException {
         ICacheMemoryAllocator allocator = new HeapBufferAllocator();
-        bufferCache = new InMemoryBufferCache(allocator, pageSize, numPages, new TransientFileMapManager());
+        bufferCache = new VirtualBufferCache(allocator, new TransientFileMapManager(), pageSize, numPages);
         TypeAwareTupleWriterFactory tupleWriterFactory = new TypeAwareTupleWriterFactory(typeTraits);
         ITreeIndexFrameFactory leafFrameFactory = new BTreeNSMLeafFrameFactory(tupleWriterFactory);
         ITreeIndexFrameFactory interiorFrameFactory = new BTreeNSMInteriorFrameFactory(tupleWriterFactory);
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/LSMTreeRunner.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/LSMTreeRunner.java
index 5a9726b..8b9e4e2 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/LSMTreeRunner.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/perf/LSMTreeRunner.java
@@ -35,14 +35,14 @@
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallback;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.impls.LSMBTree;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.util.LSMBTreeUtils;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoOpIOOperationCallback;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.SynchronousScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ThreadCountingOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
@@ -90,14 +90,15 @@
         ioManager = TestStorageManagerComponentHolder.getIOManager();
         IFileMapProvider fmp = TestStorageManagerComponentHolder.getFileMapProvider(ctx);
 
-        IInMemoryBufferCache memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), inMemPageSize,
-                inMemNumPages, new TransientFileMapManager());
+        IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                new TransientFileMapManager(), inMemPageSize, inMemNumPages);
         IInMemoryFreePageManager memFreePageManager = new InMemoryFreePageManager(inMemNumPages,
                 new LIFOMetaDataFrameFactory());
         this.ioScheduler = SynchronousScheduler.INSTANCE;
-        lsmtree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file, bufferCache, fmp,
-                typeTraits, cmpFactories, bloomFilterKeyFields, bloomFilterFalsePositiveRate, NoMergePolicy.INSTANCE,
-                ThreadCountingOperationTrackerFactory.INSTANCE, ioScheduler, NoOpIOOperationCallback.INSTANCE);
+        lsmtree = LSMBTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file, bufferCache,
+                fmp, typeTraits, cmpFactories, bloomFilterKeyFields, bloomFilterFalsePositiveRate,
+                NoMergePolicy.INSTANCE, ThreadCountingOperationTrackerFactory.INSTANCE, ioScheduler,
+                NoOpIOOperationCallback.INSTANCE);
     }
 
     @Override
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestContext.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestContext.java
index 18ddf4c..177dd96 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestContext.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestContext.java
@@ -28,11 +28,11 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
 import edu.uci.ics.hyracks.storage.am.lsm.btree.impls.LSMBTree;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
 
@@ -63,7 +63,7 @@
         upsertCheckTuple(checkTuple, checkTuples);
     }
 
-    public static LSMBTreeTestContext create(IInMemoryBufferCache memBufferCache,
+    public static LSMBTreeTestContext create(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ISerializerDeserializer[] fieldSerdes,
             int numKeyFields, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
@@ -75,7 +75,7 @@
         for (int i = 0; i < numKeyFields; ++i) {
             bloomFilterKeyFields[i] = i;
         }
-        LSMBTree lsmTree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file,
+        LSMBTree lsmTree = LSMBTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file,
                 diskBufferCache, diskFileMapProvider, typeTraits, cmpFactories, bloomFilterKeyFields,
                 bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
         LSMBTreeTestContext testCtx = new LSMBTreeTestContext(fieldSerdes, lsmTree);
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestHarness.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestHarness.java
index 231c8ff..858f695 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestHarness.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-btree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/btree/util/LSMBTreeTestHarness.java
@@ -32,17 +32,17 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.config.AccessMethodTestsConfig;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoOpIOOperationCallback;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.SynchronousScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ThreadCountingOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
@@ -68,7 +68,7 @@
     protected IOManager ioManager;
     protected IBufferCache diskBufferCache;
     protected IFileMapProvider diskFileMapProvider;
-    protected IInMemoryBufferCache memBufferCache;
+    protected IVirtualBufferCache virtualBufferCache;
     protected IInMemoryFreePageManager memFreePageManager;
     protected IHyracksTaskContext ctx;
     protected ILSMIOOperationScheduler ioScheduler;
@@ -117,8 +117,8 @@
         TestStorageManagerComponentHolder.init(diskPageSize, diskNumPages, diskMaxOpenFiles);
         diskBufferCache = TestStorageManagerComponentHolder.getBufferCache(ctx);
         diskFileMapProvider = TestStorageManagerComponentHolder.getFileMapProvider(ctx);
-        memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), memPageSize, memNumPages,
-                new TransientFileMapManager());
+        virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(), new TransientFileMapManager(),
+                memPageSize, memNumPages);
         memFreePageManager = new InMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
         ioManager = TestStorageManagerComponentHolder.getIOManager();
         rnd.setSeed(RANDOM_SEED);
@@ -180,8 +180,8 @@
         return diskFileMapProvider;
     }
 
-    public IInMemoryBufferCache getMemBufferCache() {
-        return memBufferCache;
+    public IVirtualBufferCache getVirtualBufferCache() {
+        return virtualBufferCache;
     }
 
     public double getBoomFilterFalsePositiveRate() {
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-common-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/common/InMemoryBufferCacheTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-common-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/common/InMemoryBufferCacheTest.java
deleted file mode 100644
index adba93d..0000000
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-common-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/common/InMemoryBufferCacheTest.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * Copyright 2009-2010 by The Regents of the University of California
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * you may obtain a copy of the License from
- * 
- *     http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package edu.uci.ics.hyracks.storage.am.lsm.common;
-
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.fail;
-
-import java.util.HashSet;
-
-import org.junit.Test;
-
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryBufferCache;
-import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
-import edu.uci.ics.hyracks.storage.common.buffercache.ICachedPage;
-import edu.uci.ics.hyracks.storage.common.file.BufferedFileHandle;
-import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
-
-public class InMemoryBufferCacheTest {
-    private static final int PAGE_SIZE = 256;
-    private static final int NUM_PAGES = 100;
-    private HashSet<ICachedPage> pinnedPages = new HashSet<ICachedPage>();
-
-    @Test
-    public void test01() throws Exception {
-        InMemoryBufferCache memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), PAGE_SIZE, NUM_PAGES,
-                new TransientFileMapManager());
-        memBufferCache.open();
-        int dummyFileId = 0;
-        // Pin all pages, and make sure they return unique ICachedPages.
-        // We expect no overflow pages.
-        for (int i = 0; i < NUM_PAGES; i++) {
-            ICachedPage page = memBufferCache.pin(BufferedFileHandle.getDiskPageId(dummyFileId, i), false);
-            if (pinnedPages.contains(page)) {
-                fail("Id collision for ICachedPage, caused by id: " + i);
-            }
-            pinnedPages.add(page);
-            assertEquals(0, memBufferCache.getNumOverflowPages());
-        }
-        // Pin pages above capacity. We expect to be given new overflow pages.
-        // Going above capacity should be very rare, but nevertheless succeed.
-        for (int i = 0; i < 100; i++) {
-            ICachedPage page = memBufferCache.pin(BufferedFileHandle.getDiskPageId(dummyFileId, i + NUM_PAGES), false);
-            if (pinnedPages.contains(page)) {
-                fail("Id collision for ICachedPage, caused by overflow id: " + i);
-            }
-            pinnedPages.add(page);
-            assertEquals(i + 1, memBufferCache.getNumOverflowPages());
-        }
-        memBufferCache.close();
-    }
-}
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/common/LSMInvertedIndexTestHarness.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/common/LSMInvertedIndexTestHarness.java
index 9c617a1..6bf2f93 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/common/LSMInvertedIndexTestHarness.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/common/LSMInvertedIndexTestHarness.java
@@ -30,20 +30,21 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.config.AccessMethodTestsConfig;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryBufferCache;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryFreePageManager;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoOpIOOperationCallback;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.SynchronousScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ThreadCountingOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
+import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 import edu.uci.ics.hyracks.test.support.TestStorageManagerComponentHolder;
 import edu.uci.ics.hyracks.test.support.TestUtils;
 
@@ -62,7 +63,7 @@
     protected IOManager ioManager;
     protected IBufferCache diskBufferCache;
     protected IFileMapProvider diskFileMapProvider;
-    protected IInMemoryBufferCache memBufferCache;
+    protected IVirtualBufferCache virtualBufferCache;
     protected IInMemoryFreePageManager memFreePageManager;
     protected IHyracksTaskContext ctx;
     protected ILSMIOOperationScheduler ioScheduler;
@@ -112,9 +113,10 @@
         TestStorageManagerComponentHolder.init(diskPageSize, diskNumPages, diskMaxOpenFiles);
         diskBufferCache = TestStorageManagerComponentHolder.getBufferCache(ctx);
         diskFileMapProvider = TestStorageManagerComponentHolder.getFileMapProvider(ctx);
-        memBufferCache = new DualIndexInMemoryBufferCache(new HeapBufferAllocator(), memPageSize, memNumPages);
-        memBufferCache.open();
-        memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
+        virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(), new TransientFileMapManager(),
+                memPageSize, memNumPages);
+        virtualBufferCache.open();
+        memFreePageManager = new InMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
         ioManager = TestStorageManagerComponentHolder.getIOManager();
         rnd.setSeed(RANDOM_SEED);
         invIndexFileRef = ioManager.getIODevices().get(0).createFileReference(onDiskDir + invIndexFileName);
@@ -138,7 +140,7 @@
             }
             dir.delete();
         }
-        memBufferCache.close();
+        virtualBufferCache.close();
     }
 
     public FileReference getInvListsFileRef() {
@@ -181,8 +183,8 @@
         return diskFileMapProvider;
     }
 
-    public IInMemoryBufferCache getMemBufferCache() {
-        return memBufferCache;
+    public IVirtualBufferCache getVirtualBufferCache() {
+        return virtualBufferCache;
     }
 
     public double getBoomFilterFalsePositiveRate() {
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/LSMInvertedIndexTestContext.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/LSMInvertedIndexTestContext.java
index bafe82b..36aa57b 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/LSMInvertedIndexTestContext.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-invertedindex-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/util/LSMInvertedIndexTestContext.java
@@ -118,13 +118,13 @@
         IInvertedIndex invIndex;
         switch (invIndexType) {
             case INMEMORY: {
-                invIndex = InvertedIndexUtils.createInMemoryBTreeInvertedindex(harness.getMemBufferCache(),
+                invIndex = InvertedIndexUtils.createInMemoryBTreeInvertedindex(harness.getVirtualBufferCache(),
                         harness.getMemFreePageManager(), invListTypeTraits, invListCmpFactories, tokenTypeTraits,
                         tokenCmpFactories, tokenizerFactory);
                 break;
             }
             case PARTITIONED_INMEMORY: {
-                invIndex = InvertedIndexUtils.createPartitionedInMemoryBTreeInvertedindex(harness.getMemBufferCache(),
+                invIndex = InvertedIndexUtils.createPartitionedInMemoryBTreeInvertedindex(harness.getVirtualBufferCache(),
                         harness.getMemFreePageManager(), invListTypeTraits, invListCmpFactories, tokenTypeTraits,
                         tokenCmpFactories, tokenizerFactory);
                 break;
@@ -142,7 +142,7 @@
                 break;
             }
             case LSM: {
-                invIndex = InvertedIndexUtils.createLSMInvertedIndex(harness.getMemBufferCache(),
+                invIndex = InvertedIndexUtils.createLSMInvertedIndex(harness.getVirtualBufferCache(),
                         harness.getMemFreePageManager(), harness.getDiskFileMapProvider(), invListTypeTraits,
                         invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory,
                         harness.getDiskBufferCache(), harness.getIOManager(), harness.getOnDiskDir(),
@@ -152,7 +152,7 @@
                 break;
             }
             case PARTITIONED_LSM: {
-                invIndex = InvertedIndexUtils.createPartitionedLSMInvertedIndex(harness.getMemBufferCache(),
+                invIndex = InvertedIndexUtils.createPartitionedLSMInvertedIndex(harness.getVirtualBufferCache(),
                         harness.getMemFreePageManager(), harness.getDiskFileMapProvider(), invListTypeTraits,
                         invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory,
                         harness.getDiskBufferCache(), harness.getIOManager(), harness.getOnDiskDir(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeBulkLoadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeBulkLoadTest.java
index 4dffcdd..9bea08c 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeBulkLoadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeBulkLoadTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeDeleteTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeDeleteTest.java
index 039c1e5..e145500 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeDeleteTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeDeleteTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java
index 8ebb0e4..548f4d4 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java
@@ -37,7 +37,7 @@
     protected ITreeIndex createTreeIndex(ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
             IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
             RTreePolicyType rtreePolicyType) throws TreeIndexException {
-        return LSMRTreeUtils.createLSMTree(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeUtils.createLSMTree(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories, btreeCmpFactories,
                 valueProviderFactories, rtreePolicyType, harness.getBoomFilterFalsePositiveRate(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeInsertTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeInsertTest.java
index 0cceece..4857edc 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeInsertTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeInsertTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeLifecycleTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeLifecycleTest.java
index 18ccefb..89ae2a1 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeLifecycleTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeLifecycleTest.java
@@ -52,7 +52,7 @@
     @Override
     public void setup() throws Exception {
         harness.setUp();
-        testCtx = LSMRTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        testCtx = LSMRTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, RTreePolicyType.RTREE,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMergeTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMergeTest.java
index a2088d1..5d23fde 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMergeTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMergeTest.java
@@ -53,7 +53,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMultiBulkLoadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMultiBulkLoadTest.java
index edcc69e..324c94f 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMultiBulkLoadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeMultiBulkLoadTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeTestContext.create(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeTestContext.create(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesBulkLoadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesBulkLoadTest.java
index 81a952d..a0992e5 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesBulkLoadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesBulkLoadTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getMemBufferCache(),
+        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesDeleteTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesDeleteTest.java
index 1ee92d9..5992fbf 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesDeleteTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesDeleteTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getMemBufferCache(),
+        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java
index 3a2537c..b4cb78a 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java
@@ -37,7 +37,7 @@
     protected ITreeIndex createTreeIndex(ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
             IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
             RTreePolicyType rtreePolicyType) throws TreeIndexException {
-        return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(harness.getMemBufferCache(),
+        return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories,
                 btreeCmpFactories, valueProviderFactories, rtreePolicyType, harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesInsertTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesInsertTest.java
index 61d5ce7..25f2b80 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesInsertTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesInsertTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getMemBufferCache(),
+        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesLifecycleTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesLifecycleTest.java
index aee8670..356b18e 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesLifecycleTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesLifecycleTest.java
@@ -52,7 +52,7 @@
     @Override
     public void setup() throws Exception {
         harness.setUp();
-        testCtx = LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getMemBufferCache(),
+        testCtx = LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, RTreePolicyType.RTREE, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMergeTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMergeTest.java
index d5fecbf..4f7b4a7 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMergeTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMergeTest.java
@@ -53,7 +53,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getMemBufferCache(),
+        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMultiBulkLoadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMultiBulkLoadTest.java
index de5f065..e3f7828 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMultiBulkLoadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesMultiBulkLoadTest.java
@@ -54,7 +54,7 @@
     protected AbstractRTreeTestContext createTestContext(ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeys, RTreePolicyType rtreePolicyType)
             throws Exception {
-        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getMemBufferCache(),
+        return LSMRTreeWithAntiMatterTuplesTestContext.create(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java
index fc8fd3e..72b2258 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java
@@ -57,7 +57,7 @@
     protected ITreeIndex createTreeIndex(ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
             IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
             RTreePolicyType rtreePolicyType) throws TreeIndexException {
-        return LSMRTreeUtils.createLSMTree(harness.getMemBufferCache(), harness.getMemFreePageManager(),
+        return LSMRTreeUtils.createLSMTree(harness.getVirtualBufferCache(), harness.getMemFreePageManager(),
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories, btreeCmpFactories,
                 valueProviderFactories, rtreePolicyType, harness.getBoomFilterFalsePositiveRate(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java
index af73676..ccf848a 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java
@@ -57,7 +57,7 @@
     protected ITreeIndex createTreeIndex(ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
             IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
             RTreePolicyType rtreePolicyType) throws TreeIndexException {
-        return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(harness.getMemBufferCache(),
+        return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(harness.getVirtualBufferCache(),
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories,
                 btreeCmpFactories, valueProviderFactories, rtreePolicyType, harness.getMergePolicy(),
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java
index 14bec98..b64a3f2 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java
@@ -26,11 +26,11 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.impls.LSMRTree;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.utils.LSMRTreeUtils;
 import edu.uci.ics.hyracks.storage.am.rtree.AbstractRTreeTestContext;
@@ -67,7 +67,7 @@
         return lsmTree.getComparatorFactories();
     }
 
-    public static LSMRTreeTestContext create(IInMemoryBufferCache memBufferCache,
+    public static LSMRTreeTestContext create(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeyFields, RTreePolicyType rtreePolicyType,
@@ -79,7 +79,7 @@
                 .serdesToComparatorFactories(fieldSerdes, numKeyFields);
         IBinaryComparatorFactory[] btreeCmpFactories = SerdeUtils.serdesToComparatorFactories(fieldSerdes,
                 fieldSerdes.length);
-        LSMRTree lsmTree = LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file,
+        LSMRTree lsmTree = LSMRTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file,
                 diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
                 valueProviderFactories, rtreePolicyType, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory,
                 ioScheduler, ioOpCallbackProvider,
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestHarness.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestHarness.java
index 2270526..fe090af 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestHarness.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestHarness.java
@@ -31,20 +31,21 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.config.AccessMethodTestsConfig;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryBufferCache;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.DualIndexInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.NoOpIOOperationCallback;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.SynchronousScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ThreadCountingOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.buffercache.IBufferCache;
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
+import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 import edu.uci.ics.hyracks.test.support.TestStorageManagerComponentHolder;
 import edu.uci.ics.hyracks.test.support.TestUtils;
 
@@ -64,7 +65,7 @@
     protected IOManager ioManager;
     protected IBufferCache diskBufferCache;
     protected IFileMapProvider diskFileMapProvider;
-    protected IInMemoryBufferCache memBufferCache;
+    protected IVirtualBufferCache virtualBufferCache;
     protected IInMemoryFreePageManager memFreePageManager;
     protected IHyracksTaskContext ctx;
     protected ILSMIOOperationScheduler ioScheduler;
@@ -113,7 +114,8 @@
         TestStorageManagerComponentHolder.init(diskPageSize, diskNumPages, diskMaxOpenFiles);
         diskBufferCache = TestStorageManagerComponentHolder.getBufferCache(ctx);
         diskFileMapProvider = TestStorageManagerComponentHolder.getFileMapProvider(ctx);
-        memBufferCache = new DualIndexInMemoryBufferCache(new HeapBufferAllocator(), memPageSize, memNumPages);
+        virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(), new TransientFileMapManager(),
+                memPageSize, memNumPages);
         memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
         ioManager = TestStorageManagerComponentHolder.getIOManager();
         rnd.setSeed(RANDOM_SEED);
@@ -175,8 +177,8 @@
         return diskFileMapProvider;
     }
 
-    public IInMemoryBufferCache getMemBufferCache() {
-        return memBufferCache;
+    public IVirtualBufferCache getVirtualBufferCache() {
+        return virtualBufferCache;
     }
 
     public double getBoomFilterFalsePositiveRate() {
diff --git a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java
index 5860236..a5132cf 100644
--- a/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java
+++ b/hyracks/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java
@@ -26,11 +26,11 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IInMemoryFreePageManager;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTrackerFactory;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.IVirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.impls.LSMRTreeWithAntiMatterTuples;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.utils.LSMRTreeUtils;
 import edu.uci.ics.hyracks.storage.am.rtree.AbstractRTreeTestContext;
@@ -67,7 +67,7 @@
         return lsmTree.getComparatorFactories();
     }
 
-    public static LSMRTreeWithAntiMatterTuplesTestContext create(IInMemoryBufferCache memBufferCache,
+    public static LSMRTreeWithAntiMatterTuplesTestContext create(IVirtualBufferCache virtualBufferCache,
             IInMemoryFreePageManager memFreePageManager, IOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeyFields, RTreePolicyType rtreePolicyType,
@@ -79,7 +79,7 @@
                 .serdesToComparatorFactories(fieldSerdes, numKeyFields);
         IBinaryComparatorFactory[] btreeCmpFactories = SerdeUtils.serdesToComparatorFactories(fieldSerdes,
                 fieldSerdes.length);
-        LSMRTreeWithAntiMatterTuples lsmTree = LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(memBufferCache,
+        LSMRTreeWithAntiMatterTuples lsmTree = LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(virtualBufferCache,
                 memFreePageManager, ioManager, file, diskBufferCache, diskFileMapProvider, typeTraits,
                 rtreeCmpFactories, btreeCmpFactories, valueProviderFactories, rtreePolicyType, mergePolicy,
                 opTrackerFactory, ioScheduler, ioOpCallbackProvider,