diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java
index f3ccc9c..ef60a7f 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java
@@ -75,9 +75,9 @@
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 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.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.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;
@@ -335,8 +335,8 @@
     private static void enlistMetadataDataset(IMetadataIndex index, boolean create) throws Exception {
         String filePath = metadataStore + File.separator + index.getFileNameRelativePath();
         FileReference file = new FileReference(new File(filePath));
-        IInMemoryBufferCache memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), DEFAULT_MEM_PAGE_SIZE,
-                DEFAULT_MEM_NUM_PAGES, new TransientFileMapManager());
+        IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                new TransientFileMapManager(), DEFAULT_MEM_PAGE_SIZE, DEFAULT_MEM_NUM_PAGES);
         ITypeTraits[] typeTraits = index.getTypeTraits();
         IBinaryComparatorFactory[] comparatorFactories = index.getKeyBinaryComparatorFactory();
         int[] bloomFilterKeyFields = index.getBloomFilterKeyFields();
@@ -346,8 +346,8 @@
         LSMBTree lsmBtree = null;
         long resourceID = -1;
         if (create) {
-            lsmBtree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file, bufferCache,
-                    fileMapProvider, typeTraits, comparatorFactories, bloomFilterKeyFields,
+            lsmBtree = LSMBTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file,
+                    bufferCache, fileMapProvider, typeTraits, comparatorFactories, bloomFilterKeyFields,
                     runtimeContext.getBloomFilterFalsePositiveRate(), runtimeContext.getLSMMergePolicy(),
                     runtimeContext.getLSMBTreeOperationTrackerFactory(), runtimeContext.getLSMIOScheduler(),
                     AsterixRuntimeComponentsProvider.LSMBTREE_PROVIDER);
@@ -368,7 +368,7 @@
             resourceID = localResourceRepository.getResourceByName(file.getFile().getPath()).getResourceId();
             lsmBtree = (LSMBTree) indexLifecycleManager.getIndex(resourceID);
             if (lsmBtree == null) {
-                lsmBtree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file,
+                lsmBtree = LSMBTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager, ioManager, file,
                         bufferCache, fileMapProvider, typeTraits, comparatorFactories, bloomFilterKeyFields,
                         runtimeContext.getBloomFilterFalsePositiveRate(), runtimeContext.getLSMMergePolicy(),
                         runtimeContext.getLSMBTreeOperationTrackerFactory(), runtimeContext.getLSMIOScheduler(),
diff --git a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMBTreeLocalResourceMetadata.java b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMBTreeLocalResourceMetadata.java
index 7ab0d10..5c20d46 100644
--- a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMBTreeLocalResourceMetadata.java
+++ b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMBTreeLocalResourceMetadata.java
@@ -11,10 +11,10 @@
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 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.ILSMIndex;
-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.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.common.buffercache.HeapBufferAllocator;
 import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 
@@ -41,11 +41,11 @@
     public ILSMIndex createIndexInstance(IAsterixAppRuntimeContextProvider runtimeContextProvider, String filePath,
             int partition) {
         FileReference file = new FileReference(new File(filePath));
-        IInMemoryBufferCache memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), memPageSize,
-                memNumPages, new TransientFileMapManager());
+        IVirtualBufferCache virtualBufferCache = new VirtualBufferCache(new HeapBufferAllocator(),
+                new TransientFileMapManager(), memPageSize, memNumPages);
         ITreeIndexMetaDataFrameFactory metaDataFrameFactory = new LIFOMetaDataFrameFactory();
         IInMemoryFreePageManager memFreePageManager = new InMemoryFreePageManager(memNumPages, metaDataFrameFactory);
-        LSMBTree lsmBTree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager,
+        LSMBTree lsmBTree = LSMBTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager,
                 runtimeContextProvider.getIOManager(), file, runtimeContextProvider.getBufferCache(),
                 runtimeContextProvider.getFileMapManager(), typeTraits, cmpFactories, bloomFilterKeyFields,
                 runtimeContextProvider.getBloomFilterFalsePositiveRate(), runtimeContextProvider.getLSMMergePolicy(),
diff --git a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMInvertedIndexLocalResourceMetadata.java b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMInvertedIndexLocalResourceMetadata.java
index 3bcb747..cb20399 100644
--- a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMInvertedIndexLocalResourceMetadata.java
+++ b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMInvertedIndexLocalResourceMetadata.java
@@ -8,13 +8,14 @@
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 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.ILSMIndex;
-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.VirtualBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.tokenizers.IBinaryTokenizerFactory;
 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.file.TransientFileMapManager;
 
 public class LSMInvertedIndexLocalResourceMetadata implements ILocalResourceMetadata {
 
@@ -48,13 +49,13 @@
             int partition) throws HyracksDataException {
 
         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);
         try {
             if (isPartitioned) {
-                return InvertedIndexUtils.createPartitionedLSMInvertedIndex(memBufferCache, memFreePageManager,
+                return InvertedIndexUtils.createPartitionedLSMInvertedIndex(virtualBufferCache, memFreePageManager,
                         runtimeContextProvider.getFileMapManager(), invListTypeTraits, invListCmpFactories,
                         tokenTypeTraits, tokenCmpFactories, tokenizerFactory, runtimeContextProvider.getBufferCache(),
                         runtimeContextProvider.getIOManager(), filePath,
@@ -64,7 +65,7 @@
                         runtimeContextProvider.getLSMIOScheduler(),
                         runtimeContextProvider.getLSMInvertedIndexIOOperationCallbackProvider(), partition);
             } else {
-                return InvertedIndexUtils.createLSMInvertedIndex(memBufferCache, memFreePageManager,
+                return InvertedIndexUtils.createLSMInvertedIndex(virtualBufferCache, memFreePageManager,
                         runtimeContextProvider.getFileMapManager(), invListTypeTraits, invListCmpFactories,
                         tokenTypeTraits, tokenCmpFactories, tokenizerFactory, runtimeContextProvider.getBufferCache(),
                         runtimeContextProvider.getIOManager(), filePath,
diff --git a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMRTreeLocalResourceMetadata.java b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMRTreeLocalResourceMetadata.java
index ff26c54..53426ae 100644
--- a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMRTreeLocalResourceMetadata.java
+++ b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/resource/LSMRTreeLocalResourceMetadata.java
@@ -13,13 +13,14 @@
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndexMetaDataFrameFactory;
 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.lsm.common.api.IInMemoryBufferCache;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndex;
-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.VirtualBufferCache;
 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.HeapBufferAllocator;
+import edu.uci.ics.hyracks.storage.common.file.TransientFileMapManager;
 
 public class LSMRTreeLocalResourceMetadata implements ILocalResourceMetadata {
 
@@ -53,13 +54,13 @@
             int partition) throws HyracksDataException {
         FileReference file = new FileReference(new File(filePath));
         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);
 
         try {
-            return LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager,
+            return LSMRTreeUtils.createLSMTree(virtualBufferCache, memFreePageManager,
                     runtimeContextProvider.getIOManager(), file, runtimeContextProvider.getBufferCache(),
                     runtimeContextProvider.getFileMapManager(), typeTraits, rtreeCmpFactories, btreeCmpFactories,
                     valueProviderFactories, rtreePolicyType, runtimeContextProvider.getBloomFilterFalsePositiveRate(),