diff --git a/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileSplit.java b/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileSplit.java
index b74d97b..35649ca 100644
--- a/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileSplit.java
+++ b/hyracks/hyracks-dataflow-std/src/main/java/edu/uci/ics/hyracks/dataflow/std/file/FileSplit.java
@@ -23,17 +23,25 @@
     private static final long serialVersionUID = 1L;
 
     private final String nodeName;
-
     private final FileReference file;
+    private final int ioDeviceId;
 
     public FileSplit(String nodeName, FileReference file) {
         this.nodeName = nodeName;
         this.file = file;
+        this.ioDeviceId = 0;
+    }
+
+    public FileSplit(String nodeName, FileReference file, int ioDeviceId) {
+        this.nodeName = nodeName;
+        this.file = file;
+        this.ioDeviceId = ioDeviceId;
     }
 
     public FileSplit(String nodeName, String path) {
         this.nodeName = nodeName;
         this.file = new FileReference(new File(path));
+        this.ioDeviceId = 0;
     }
 
     public String getNodeName() {
@@ -43,4 +51,8 @@
     public FileReference getLocalFile() {
         return file;
     }
+
+    public int getIODeviceId() {
+        return ioDeviceId;
+    }
 }
\ No newline at end of file
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..eb2e760 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
@@ -64,6 +64,7 @@
                 .getStorageManager().getBufferCache(ctx), opDesc.getStorageManager().getFileMapProvider(ctx),
                 treeOpDesc.getTreeIndexTypeTraits(), treeOpDesc.getTreeIndexComparatorFactories(), treeOpDesc
                         .getTreeIndexBloomFilterKeyFields(), bloomFilterFalsePositiveRate, mergePolicy,
-                opTrackerFactory, ioScheduler, ioOpCallbackProvider, partition);
+                opTrackerFactory, ioScheduler, ioOpCallbackProvider,
+                opDesc.getFileSplitProvider().getFileSplits()[partition].getIODeviceId());
     }
 }
diff --git a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTreeFileManager.java b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTreeFileManager.java
index bbcee06..6a894e9 100644
--- a/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTreeFileManager.java
+++ b/hyracks/hyracks-storage-am-lsm-btree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/btree/impls/LSMBTreeFileManager.java
@@ -41,8 +41,8 @@
     private final TreeIndexFactory<? extends ITreeIndex> btreeFactory;
 
     public LSMBTreeFileManager(IIOManager ioManager, IFileMapProvider fileMapProvider, FileReference file,
-            TreeIndexFactory<? extends ITreeIndex> btreeFactory, int startIODeviceIndex) {
-        super(ioManager, fileMapProvider, file, null, startIODeviceIndex);
+            TreeIndexFactory<? extends ITreeIndex> btreeFactory, int ioDeviceId) {
+        super(ioManager, fileMapProvider, file, null, ioDeviceId);
         this.btreeFactory = btreeFactory;
     }
 
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..d92e93d 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
@@ -45,25 +45,12 @@
 import edu.uci.ics.hyracks.storage.common.file.IFileMapProvider;
 
 public class LSMBTreeUtils {
-
     public static LSMBTree createLSMTree(IInMemoryBufferCache memBufferCache,
             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);
-    }
-
-    public static LSMBTree createLSMTree(IInMemoryBufferCache memBufferCache,
-            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,
-            int startIODeviceIndex) {
+            ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider, int ioDeviceId) {
         LSMBTreeTupleWriterFactory insertTupleWriterFactory = new LSMBTreeTupleWriterFactory(typeTraits,
                 cmpFactories.length, false);
         LSMBTreeTupleWriterFactory deleteTupleWriterFactory = new LSMBTreeTupleWriterFactory(typeTraits,
@@ -88,7 +75,7 @@
                 bloomFilterKeyFields);
 
         ILSMIndexFileManager fileNameManager = new LSMBTreeFileManager(ioManager, diskFileMapProvider, file,
-                diskBTreeFactory, startIODeviceIndex);
+                diskBTreeFactory, ioDeviceId);
 
         LSMBTree lsmTree = new LSMBTree(memBufferCache, memFreePageManager, interiorFrameFactory,
                 insertLeafFrameFactory, deleteLeafFrameFactory, fileNameManager, diskBTreeFactory,
diff --git a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AbstractLSMIndexFileManager.java b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AbstractLSMIndexFileManager.java
index a808143..ca147d6 100644
--- a/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AbstractLSMIndexFileManager.java
+++ b/hyracks/hyracks-storage-am-lsm-common/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/common/impls/AbstractLSMIndexFileManager.java
@@ -44,10 +44,9 @@
     protected static final String SPLIT_STRING = "_";
     protected static final String BLOOM_FILTER_STRING = "f";
 
-    // Use all IODevices registered in ioManager in a round-robin fashion to choose
-    // where to flush and merge
     protected final IIOManager ioManager;
     protected final IFileMapProvider fileMapProvider;
+    protected final IODeviceHandle dev;
 
     // baseDir should reflect dataset name and partition name.
     protected String baseDir;
@@ -57,11 +56,8 @@
 
     protected final TreeIndexFactory<? extends ITreeIndex> treeFactory;
 
-    // The current index for the round-robin file assignment
-    private int ioDeviceIndex = 0;
-
     public AbstractLSMIndexFileManager(IIOManager ioManager, IFileMapProvider fileMapProvider, FileReference file,
-            TreeIndexFactory<? extends ITreeIndex> treeFactory, int startIODeviceIndex) {
+            TreeIndexFactory<? extends ITreeIndex> treeFactory, int ioDeviceId) {
         this.baseDir = file.getFile().getPath();
         if (!baseDir.endsWith(System.getProperty("file.separator"))) {
             baseDir += System.getProperty("file.separator");
@@ -69,7 +65,7 @@
         this.fileMapProvider = fileMapProvider;
         this.ioManager = ioManager;
         this.treeFactory = treeFactory;
-        ioDeviceIndex = startIODeviceIndex % ioManager.getIODevices().size();
+        this.dev = ioManager.getIODevices().get(ioDeviceId);
     }
 
     private static FilenameFilter fileNameFilter = new FilenameFilter() {
@@ -165,9 +161,6 @@
     };
 
     protected FileReference createFlushFile(String relFlushFileName) {
-        // Assigns new files to I/O devices in round-robin fashion.
-        IODeviceHandle dev = ioManager.getIODevices().get(ioDeviceIndex);
-        ioDeviceIndex = (ioDeviceIndex + 1) % ioManager.getIODevices().size();
         return dev.createFileReference(relFlushFileName);
     }
 
@@ -198,14 +191,12 @@
         List<LSMComponentFileReferences> validFiles = new ArrayList<LSMComponentFileReferences>();
         ArrayList<ComparableFileName> allFiles = new ArrayList<ComparableFileName>();
 
-        // Gather files from all IODeviceHandles and delete invalid files
+        // Gather files from the IODeviceHandle and delete invalid files
         // There are two types of invalid files:
         // (1) The isValid flag is not set
         // (2) The file's interval is contained by some other file
         // Here, we only filter out (1).
-        for (IODeviceHandle dev : ioManager.getIODevices()) {
-            cleanupAndGetValidFilesInternal(dev, fileNameFilter, treeFactory, allFiles);
-        }
+        cleanupAndGetValidFilesInternal(dev, fileNameFilter, treeFactory, allFiles);
 
         if (allFiles.isEmpty()) {
             return validFiles;
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..c97e10d 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
@@ -67,11 +67,12 @@
             IBufferCache diskBufferCache = opDesc.getStorageManager().getBufferCache(ctx);
             IFileMapProvider diskFileMapProvider = opDesc.getStorageManager().getFileMapProvider(ctx);
             LSMInvertedIndex invIndex = InvertedIndexUtils.createLSMInvertedIndex(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);
+                    diskFileMapProvider, invIndexOpDesc.getInvListsTypeTraits(), invIndexOpDesc
+                            .getInvListsComparatorFactories(), invIndexOpDesc.getTokenTypeTraits(), invIndexOpDesc
+                            .getTokenComparatorFactories(), invIndexOpDesc.getTokenizerFactory(), diskBufferCache, ctx
+                            .getIOManager(), file.getFile().getPath(), bloomFilterFalsePositiveRate, mergePolicy,
+                    opTrackerFactory, ioScheduler, ioOpCallbackProvider,
+                    opDesc.getFileSplitProvider().getFileSplits()[partition].getIODeviceId());
             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/LSMInvertedIndexFileManager.java b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndexFileManager.java
index ccba624..aa1dbeb 100644
--- a/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndexFileManager.java
+++ b/hyracks/hyracks-storage-am-lsm-invertedindex/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/invertedindex/impls/LSMInvertedIndexFileManager.java
@@ -27,7 +27,6 @@
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.api.io.FileReference;
 import edu.uci.ics.hyracks.api.io.IIOManager;
-import edu.uci.ics.hyracks.api.io.IODeviceHandle;
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.AbstractLSMIndexFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.BTreeFactory;
@@ -63,8 +62,8 @@
     };
 
     public LSMInvertedIndexFileManager(IIOManager ioManager, IFileMapProvider fileMapProvider, FileReference file,
-            BTreeFactory btreeFactory, int startIODeviceIndex) {
-        super(ioManager, fileMapProvider, file, null, startIODeviceIndex);
+            BTreeFactory btreeFactory, int ioDeviceId) {
+        super(ioManager, fileMapProvider, file, null, ioDeviceId);
         this.btreeFactory = btreeFactory;
     }
 
@@ -100,20 +99,19 @@
         ArrayList<ComparableFileName> allDeletedKeysBTreeFiles = new ArrayList<ComparableFileName>();
         ArrayList<ComparableFileName> allBloomFilterFiles = new ArrayList<ComparableFileName>();
 
-        // Gather files from all IODeviceHandles.
-        for (IODeviceHandle dev : ioManager.getIODevices()) {
-            cleanupAndGetValidFilesInternal(dev, deletedKeysBTreeFilter, btreeFactory, allDeletedKeysBTreeFiles);
-            HashSet<String> deletedKeysBTreeFilesSet = new HashSet<String>();
-            for (ComparableFileName cmpFileName : allDeletedKeysBTreeFiles) {
-                int index = cmpFileName.fileName.lastIndexOf(SPLIT_STRING);
-                deletedKeysBTreeFilesSet.add(cmpFileName.fileName.substring(0, index));
-            }
-
-            // TODO: do we really need to validate the inverted lists files or is validating the dict. BTrees is enough?
-            validateFiles(dev, deletedKeysBTreeFilesSet, allInvListsFiles, invListFilter, null);
-            validateFiles(dev, deletedKeysBTreeFilesSet, allDictBTreeFiles, dictBTreeFilter, btreeFactory);
-            validateFiles(dev, deletedKeysBTreeFilesSet, allBloomFilterFiles, bloomFilterFilter, null);
+        // Gather files from the IODeviceHandle.
+        cleanupAndGetValidFilesInternal(dev, deletedKeysBTreeFilter, btreeFactory, allDeletedKeysBTreeFiles);
+        HashSet<String> deletedKeysBTreeFilesSet = new HashSet<String>();
+        for (ComparableFileName cmpFileName : allDeletedKeysBTreeFiles) {
+            int index = cmpFileName.fileName.lastIndexOf(SPLIT_STRING);
+            deletedKeysBTreeFilesSet.add(cmpFileName.fileName.substring(0, index));
         }
+
+        // TODO: do we really need to validate the inverted lists files or is validating the dict. BTrees is enough?
+        validateFiles(dev, deletedKeysBTreeFilesSet, allInvListsFiles, invListFilter, null);
+        validateFiles(dev, deletedKeysBTreeFilesSet, allDictBTreeFiles, dictBTreeFilter, btreeFactory);
+        validateFiles(dev, deletedKeysBTreeFilesSet, allBloomFilterFiles, bloomFilterFilter, null);
+
         // Sanity check.
         if (allDictBTreeFiles.size() != allInvListsFiles.size()
                 || allDictBTreeFiles.size() != allDeletedKeysBTreeFiles.size()
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..06be7aa 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
@@ -124,21 +124,7 @@
             IBinaryTokenizerFactory tokenizerFactory, IBufferCache diskBufferCache, IIOManager ioManager,
             String onDiskDir, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
-            ILSMIOOperationCallbackProvider ioOpCallbackProvider) throws IndexException {
-        return createLSMInvertedIndex(memBufferCache, memFreePageManager, diskFileMapProvider, invListTypeTraits,
-                invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory, diskBufferCache, ioManager,
-                onDiskDir, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
-                ioOpCallbackProvider, 0);
-    }
-
-    public static LSMInvertedIndex createLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
-            IInMemoryFreePageManager memFreePageManager, IFileMapProvider diskFileMapProvider,
-            ITypeTraits[] invListTypeTraits, IBinaryComparatorFactory[] invListCmpFactories,
-            ITypeTraits[] tokenTypeTraits, IBinaryComparatorFactory[] tokenCmpFactories,
-            IBinaryTokenizerFactory tokenizerFactory, IBufferCache diskBufferCache, IIOManager ioManager,
-            String onDiskDir, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
-            ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
-            ILSMIOOperationCallbackProvider ioOpCallbackProvider, int startIODeviceIndex) throws IndexException {
+            ILSMIOOperationCallbackProvider ioOpCallbackProvider, int ioDeviceId) throws IndexException {
 
         BTreeFactory deletedKeysBTreeFactory = createDeletedKeysBTreeFactory(diskFileMapProvider, invListTypeTraits,
                 invListCmpFactories, diskBufferCache);
@@ -152,7 +138,7 @@
 
         FileReference onDiskDirFileRef = new FileReference(new File(onDiskDir));
         LSMInvertedIndexFileManager fileManager = new LSMInvertedIndexFileManager(ioManager, diskFileMapProvider,
-                onDiskDirFileRef, deletedKeysBTreeFactory, startIODeviceIndex);
+                onDiskDirFileRef, deletedKeysBTreeFactory, ioDeviceId);
 
         IInvertedListBuilderFactory invListBuilderFactory = new FixedSizeElementInvertedListBuilderFactory(
                 invListTypeTraits);
@@ -174,21 +160,7 @@
             IBinaryTokenizerFactory tokenizerFactory, IBufferCache diskBufferCache, IIOManager ioManager,
             String onDiskDir, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
-            ILSMIOOperationCallbackProvider ioOpCallbackProvider) throws IndexException {
-        return createPartitionedLSMInvertedIndex(memBufferCache, memFreePageManager, diskFileMapProvider,
-                invListTypeTraits, invListCmpFactories, tokenTypeTraits, tokenCmpFactories, tokenizerFactory,
-                diskBufferCache, ioManager, onDiskDir, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory,
-                ioScheduler, ioOpCallbackProvider, 0);
-    }
-
-    public static PartitionedLSMInvertedIndex createPartitionedLSMInvertedIndex(IInMemoryBufferCache memBufferCache,
-            IInMemoryFreePageManager memFreePageManager, IFileMapProvider diskFileMapProvider,
-            ITypeTraits[] invListTypeTraits, IBinaryComparatorFactory[] invListCmpFactories,
-            ITypeTraits[] tokenTypeTraits, IBinaryComparatorFactory[] tokenCmpFactories,
-            IBinaryTokenizerFactory tokenizerFactory, IBufferCache diskBufferCache, IIOManager ioManager,
-            String onDiskDir, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
-            ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
-            ILSMIOOperationCallbackProvider ioOpCallbackProvider, int startIODeviceIndex) throws IndexException {
+            ILSMIOOperationCallbackProvider ioOpCallbackProvider, int ioDeviceId) throws IndexException {
 
         BTreeFactory deletedKeysBTreeFactory = createDeletedKeysBTreeFactory(diskFileMapProvider, invListTypeTraits,
                 invListCmpFactories, diskBufferCache);
@@ -202,7 +174,7 @@
 
         FileReference onDiskDirFileRef = new FileReference(new File(onDiskDir));
         LSMInvertedIndexFileManager fileManager = new LSMInvertedIndexFileManager(ioManager, diskFileMapProvider,
-                onDiskDirFileRef, deletedKeysBTreeFactory, startIODeviceIndex);
+                onDiskDirFileRef, deletedKeysBTreeFactory, ioDeviceId);
 
         IInvertedListBuilderFactory invListBuilderFactory = new FixedSizeElementInvertedListBuilderFactory(
                 invListTypeTraits);
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..5ab5513 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
@@ -72,7 +72,8 @@
             return LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file, diskBufferCache,
                     diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories, valueProviderFactories,
                     rtreePolicyType, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler,
-                    ioOpCallbackProvider, linearizeCmpFactory, startIODeviceIndex);
+                    ioOpCallbackProvider, linearizeCmpFactory,
+                    opDesc.getFileSplitProvider().getFileSplits()[partition].getIODeviceId());
         } 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/impls/LSMRTreeFileManager.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeFileManager.java
index 851235e..fd36920 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeFileManager.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeFileManager.java
@@ -27,7 +27,6 @@
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.api.io.FileReference;
 import edu.uci.ics.hyracks.api.io.IIOManager;
-import edu.uci.ics.hyracks.api.io.IODeviceHandle;
 import edu.uci.ics.hyracks.storage.am.common.api.ITreeIndex;
 import edu.uci.ics.hyracks.storage.am.common.api.IndexException;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.AbstractLSMIndexFileManager;
@@ -56,8 +55,8 @@
 
     public LSMRTreeFileManager(IIOManager ioManager, IFileMapProvider fileMapProvider, FileReference file,
             TreeIndexFactory<? extends ITreeIndex> rtreeFactory, TreeIndexFactory<? extends ITreeIndex> btreeFactory,
-            int startIODeviceIndex) {
-        super(ioManager, fileMapProvider, file, null, startIODeviceIndex);
+            int ioDeviceId) {
+        super(ioManager, fileMapProvider, file, null, ioDeviceId);
         this.rtreeFactory = rtreeFactory;
         this.btreeFactory = btreeFactory;
     }
@@ -93,17 +92,16 @@
         ArrayList<ComparableFileName> allBTreeFiles = new ArrayList<ComparableFileName>();
         ArrayList<ComparableFileName> allBloomFilterFiles = new ArrayList<ComparableFileName>();
 
-        // Gather files from all IODeviceHandles.
-        for (IODeviceHandle dev : ioManager.getIODevices()) {
-            cleanupAndGetValidFilesInternal(dev, btreeFilter, btreeFactory, allBTreeFiles);
-            HashSet<String> btreeFilesSet = new HashSet<String>();
-            for (ComparableFileName cmpFileName : allBTreeFiles) {
-                int index = cmpFileName.fileName.lastIndexOf(SPLIT_STRING);
-                btreeFilesSet.add(cmpFileName.fileName.substring(0, index));
-            }
-            validateFiles(dev, btreeFilesSet, allRTreeFiles, rtreeFilter, rtreeFactory);
-            validateFiles(dev, btreeFilesSet, allBloomFilterFiles, bloomFilterFilter, null);
+        // Gather files from the IODeviceHandle.
+        cleanupAndGetValidFilesInternal(dev, btreeFilter, btreeFactory, allBTreeFiles);
+        HashSet<String> btreeFilesSet = new HashSet<String>();
+        for (ComparableFileName cmpFileName : allBTreeFiles) {
+            int index = cmpFileName.fileName.lastIndexOf(SPLIT_STRING);
+            btreeFilesSet.add(cmpFileName.fileName.substring(0, index));
         }
+        validateFiles(dev, btreeFilesSet, allRTreeFiles, rtreeFilter, rtreeFactory);
+        validateFiles(dev, btreeFilesSet, allBloomFilterFiles, bloomFilterFilter, null);
+
         // Sanity check.
         if (allRTreeFiles.size() != allBTreeFiles.size() || allBTreeFiles.size() != allBloomFilterFiles.size()) {
             throw new HyracksDataException(
diff --git a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuplesFileManager.java b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuplesFileManager.java
index 6ddf766..872d152 100644
--- a/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuplesFileManager.java
+++ b/hyracks/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/impls/LSMRTreeWithAntiMatterTuplesFileManager.java
@@ -25,7 +25,7 @@
 public class LSMRTreeWithAntiMatterTuplesFileManager extends AbstractLSMIndexFileManager {
 
     public LSMRTreeWithAntiMatterTuplesFileManager(IIOManager ioManager, IFileMapProvider fileMapProvider,
-            FileReference file, TreeIndexFactory<? extends ITreeIndex> rtreeFactory, int startIODeviceIndex) {
-        super(ioManager, fileMapProvider, file, rtreeFactory, startIODeviceIndex);
+            FileReference file, TreeIndexFactory<? extends ITreeIndex> rtreeFactory, int ioDeviceId) {
+        super(ioManager, fileMapProvider, file, rtreeFactory, ioDeviceId);
     }
 }
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..d299bfe 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
@@ -67,23 +67,8 @@
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             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);
-    }
-
-    public static LSMRTree createLSMTree(IInMemoryBufferCache memBufferCache,
-            IInMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
-            IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
-            IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
-            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
-            double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
-            ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
             ILSMIOOperationCallbackProvider ioOpCallbackProvider, ILinearizeComparatorFactory linearizeCmpFactory,
-            int startIODeviceIndex) throws TreeIndexException {
+            int ioDeviceId) throws TreeIndexException {
         LSMTypeAwareTupleWriterFactory rtreeTupleWriterFactory = new LSMTypeAwareTupleWriterFactory(typeTraits, false);
         LSMTypeAwareTupleWriterFactory btreeTupleWriterFactory = new LSMTypeAwareTupleWriterFactory(typeTraits, true);
 
@@ -117,7 +102,7 @@
                 bloomFilterKeyFields);
 
         ILSMIndexFileManager fileNameManager = new LSMRTreeFileManager(ioManager, diskFileMapProvider, file,
-                diskRTreeFactory, diskBTreeFactory, startIODeviceIndex);
+                diskRTreeFactory, diskBTreeFactory, ioDeviceId);
         LSMRTree lsmTree = new LSMRTree(memBufferCache, memFreePageManager, rtreeInteriorFrameFactory,
                 rtreeLeafFrameFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory, fileNameManager,
                 diskRTreeFactory, diskBTreeFactory, bloomFilterFactory, bloomFilterFalsePositiveRate,
@@ -133,21 +118,7 @@
             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);
-    }
-
-    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,
-            ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider,
-            ILinearizeComparatorFactory linearizerCmpFactory, int startIODeviceIndex) throws TreeIndexException {
+            ILinearizeComparatorFactory linearizerCmpFactory, int ioDeviceId) throws TreeIndexException {
 
         LSMRTreeTupleWriterFactory rtreeTupleWriterFactory = new LSMRTreeTupleWriterFactory(typeTraits, false);
         LSMRTreeTupleWriterFactory btreeTupleWriterFactory = new LSMRTreeTupleWriterFactory(typeTraits, true);
@@ -184,7 +155,7 @@
                 btreeCmpFactories[btreeCmpFactories.length - 1] };
 
         ILSMIndexFileManager fileNameManager = new LSMRTreeWithAntiMatterTuplesFileManager(ioManager,
-                diskFileMapProvider, file, diskRTreeFactory, startIODeviceIndex);
+                diskFileMapProvider, file, diskRTreeFactory, ioDeviceId);
         LSMRTreeWithAntiMatterTuples lsmTree = new LSMRTreeWithAntiMatterTuples(memBufferCache, memFreePageManager,
                 rtreeInteriorFrameFactory, rtreeLeafFrameFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory,
                 fileNameManager, diskRTreeFactory, bulkLoadRTreeFactory, diskFileMapProvider, typeTraits.length,
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..a7eee57 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
@@ -55,7 +55,7 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..a648ff6 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
@@ -55,7 +55,7 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..b5b0b76 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
@@ -39,7 +39,7 @@
                 harness.getDiskFileMapProvider(), typeTraits, cmpFactories, bloomFilterKeyFields,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Before
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..875bbd4 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
@@ -55,7 +55,7 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..43d38bc 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
@@ -47,7 +47,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, fieldSerdes.length,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
         index = testCtx.getIndex();
     }
 
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..0ea2af2 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
@@ -54,7 +54,7 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..901a31d 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
@@ -48,7 +48,7 @@
                 SerdeUtils.serdesToComparatorFactories(keySerdes, keySerdes.length), bloomFilterKeyFields,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 NoOpOperationTrackerFactory.INSTANCE, harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..ac8290e 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
@@ -56,7 +56,7 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..33e1641 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
@@ -41,7 +41,7 @@
                 SerdeUtils.serdesToComparatorFactories(keySerdes, keySerdes.length), bloomFilterKeyFields,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 NoOpOperationTrackerFactory.INSTANCE, harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..cc2db11 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
@@ -55,7 +55,7 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), fieldSerdes, numKeys, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..d56ff5b 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
@@ -55,7 +55,7 @@
                 harness.getDiskFileMapProvider(), typeTraits, cmpFactories, bloomFilterKeyFields,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..7e54003 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
@@ -57,6 +57,7 @@
 
     protected IHyracksTaskContext ctx;
     protected IOManager ioManager;
+    protected int ioDeviceId;
     protected IBufferCache bufferCache;
     protected int lsmtreeFileId;
 
@@ -88,6 +89,7 @@
         TestStorageManagerComponentHolder.init(this.onDiskPageSize, this.onDiskNumPages, MAX_OPEN_FILES);
         bufferCache = TestStorageManagerComponentHolder.getBufferCache(ctx);
         ioManager = TestStorageManagerComponentHolder.getIOManager();
+        ioDeviceId = 0;
         IFileMapProvider fmp = TestStorageManagerComponentHolder.getFileMapProvider(ctx);
 
         IInMemoryBufferCache memBufferCache = new InMemoryBufferCache(new HeapBufferAllocator(), inMemPageSize,
@@ -97,7 +99,8 @@
         this.ioScheduler = SynchronousScheduler.INSTANCE;
         lsmtree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file, bufferCache, fmp,
                 typeTraits, cmpFactories, bloomFilterKeyFields, bloomFilterFalsePositiveRate, NoMergePolicy.INSTANCE,
-                ThreadCountingOperationTrackerFactory.INSTANCE, ioScheduler, NoOpIOOperationCallback.INSTANCE);
+                ThreadCountingOperationTrackerFactory.INSTANCE, ioScheduler, NoOpIOOperationCallback.INSTANCE,
+                ioDeviceId);
     }
 
     @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..a830dc0 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
@@ -68,7 +68,7 @@
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ISerializerDeserializer[] fieldSerdes,
             int numKeyFields, double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
-            ILSMIOOperationCallbackProvider ioOpCallbackProvider) throws Exception {
+            ILSMIOOperationCallbackProvider ioOpCallbackProvider, int ioDeviceId) throws Exception {
         ITypeTraits[] typeTraits = SerdeUtils.serdesToTypeTraits(fieldSerdes);
         IBinaryComparatorFactory[] cmpFactories = SerdeUtils.serdesToComparatorFactories(fieldSerdes, numKeyFields);
         int[] bloomFilterKeyFields = new int[numKeyFields];
@@ -77,7 +77,8 @@
         }
         LSMBTree lsmTree = LSMBTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file,
                 diskBufferCache, diskFileMapProvider, typeTraits, cmpFactories, bloomFilterKeyFields,
-                bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider);
+                bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory, ioScheduler, ioOpCallbackProvider,
+                ioDeviceId);
         LSMBTreeTestContext testCtx = new LSMBTreeTestContext(fieldSerdes, lsmTree);
         return testCtx;
     }
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..066f57b 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
@@ -66,6 +66,7 @@
     protected final double bloomFilterFalsePositiveRate;
 
     protected IOManager ioManager;
+    protected int ioDeviceId;
     protected IBufferCache diskBufferCache;
     protected IFileMapProvider diskFileMapProvider;
     protected IInMemoryBufferCache memBufferCache;
@@ -121,6 +122,7 @@
                 new TransientFileMapManager());
         memFreePageManager = new InMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
         ioManager = TestStorageManagerComponentHolder.getIOManager();
+        ioDeviceId = 0;
         rnd.setSeed(RANDOM_SEED);
     }
 
@@ -172,6 +174,10 @@
         return ioManager;
     }
 
+    public int getIODeviceId() {
+        return ioDeviceId;
+    }
+
     public IBufferCache getDiskBufferCache() {
         return diskBufferCache;
     }
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..bf2d5e8 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
@@ -60,6 +60,7 @@
     protected final double bloomFilterFalsePositiveRate;
 
     protected IOManager ioManager;
+    protected int ioDeviceId;
     protected IBufferCache diskBufferCache;
     protected IFileMapProvider diskFileMapProvider;
     protected IInMemoryBufferCache memBufferCache;
@@ -116,6 +117,7 @@
         memBufferCache.open();
         memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
         ioManager = TestStorageManagerComponentHolder.getIOManager();
+        ioDeviceId = 0;
         rnd.setSeed(RANDOM_SEED);
         invIndexFileRef = ioManager.getIODevices().get(0).createFileReference(onDiskDir + invIndexFileName);
     }
@@ -173,6 +175,10 @@
         return ioManager;
     }
 
+    public int getIODeviceId() {
+        return ioDeviceId;
+    }
+
     public IBufferCache getDiskBufferCache() {
         return diskBufferCache;
     }
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..f955fc9 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
@@ -148,7 +148,7 @@
                         harness.getDiskBufferCache(), harness.getIOManager(), harness.getOnDiskDir(),
                         harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                         harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                        harness.getIOOperationCallbackProvider());
+                        harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
                 break;
             }
             case PARTITIONED_LSM: {
@@ -158,7 +158,7 @@
                         harness.getDiskBufferCache(), harness.getIOManager(), harness.getOnDiskDir(),
                         harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                         harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                        harness.getIOOperationCallbackProvider());
+                        harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
                 break;
             }
             default: {
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..edd24b4 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
@@ -59,7 +59,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..360c02c 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
@@ -59,7 +59,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..0c68fa6 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
@@ -43,7 +43,7 @@
                 valueProviderFactories, rtreePolicyType, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
                 harness.getIOOperationCallbackProvider(),
-                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length), harness.getIODeviceId());
     }
 
     @Before
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..f39b139 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
@@ -59,7 +59,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..8bee460 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
@@ -57,7 +57,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, RTreePolicyType.RTREE,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
         index = testCtx.getIndex();
     }
 
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..5d7d31b 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
@@ -58,7 +58,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..8ef0a9f 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
@@ -59,7 +59,7 @@
                 harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories, numKeys, rtreePolicyType,
                 harness.getBoomFilterFalsePositiveRate(), harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
-                harness.getIOOperationCallbackProvider());
+                harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..f778aa9 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
@@ -58,7 +58,7 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
-                harness.getIOScheduler(), harness.getIOOperationCallbackProvider());
+                harness.getIOScheduler(), harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
 
     }
 
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..44d3d1b 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
@@ -58,7 +58,7 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
-                harness.getIOScheduler(), harness.getIOOperationCallbackProvider());
+                harness.getIOScheduler(), harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
 
     }
 
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..8b12224 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
@@ -43,7 +43,7 @@
                 btreeCmpFactories, valueProviderFactories, rtreePolicyType, harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
                 harness.getIOOperationCallbackProvider(),
-                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length), harness.getIODeviceId());
     }
 
     @Before
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..96ef868 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
@@ -58,7 +58,7 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
-                harness.getIOScheduler(), harness.getIOOperationCallbackProvider());
+                harness.getIOScheduler(), harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
 
     }
 
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..012559d 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
@@ -56,7 +56,7 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, RTreePolicyType.RTREE, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
-                harness.getIOScheduler(), harness.getIOOperationCallbackProvider());
+                harness.getIOScheduler(), harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
         index = testCtx.getIndex();
     }
 
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..1c67cd0 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
@@ -57,7 +57,7 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
-                harness.getIOScheduler(), harness.getIOOperationCallbackProvider());
+                harness.getIOScheduler(), harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
     }
 
     @Override
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..fe61afd 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
@@ -58,7 +58,7 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), fieldSerdes, valueProviderFactories,
                 numKeys, rtreePolicyType, harness.getMergePolicy(), harness.getOperationTrackerFactory(),
-                harness.getIOScheduler(), harness.getIOOperationCallbackProvider());
+                harness.getIOScheduler(), harness.getIOOperationCallbackProvider(), harness.getIODeviceId());
 
     }
 
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..1d2271c 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
@@ -63,7 +63,7 @@
                 valueProviderFactories, rtreePolicyType, harness.getBoomFilterFalsePositiveRate(),
                 harness.getMergePolicy(), harness.getOperationTrackerFactory(), harness.getIOScheduler(),
                 harness.getIOOperationCallbackProvider(),
-                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length), harness.getIODeviceId());
     }
 
     @Override
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..aa5023d 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
@@ -63,7 +63,7 @@
                 btreeCmpFactories, valueProviderFactories, rtreePolicyType, harness.getMergePolicy(),
                 harness.getOperationTrackerFactory(), harness.getIOScheduler(),
                 harness.getIOOperationCallbackProvider(),
-                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length), harness.getIODeviceId());
 
     }
 
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..fb9fb23 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
@@ -73,7 +73,7 @@
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeyFields, RTreePolicyType rtreePolicyType,
             double bloomFilterFalsePositiveRate, ILSMMergePolicy mergePolicy,
             ILSMOperationTrackerFactory opTrackerFactory, ILSMIOOperationScheduler ioScheduler,
-            ILSMIOOperationCallbackProvider ioOpCallbackProvider) throws Exception {
+            ILSMIOOperationCallbackProvider ioOpCallbackProvider, int ioDeviceId) throws Exception {
         ITypeTraits[] typeTraits = SerdeUtils.serdesToTypeTraits(fieldSerdes);
         IBinaryComparatorFactory[] rtreeCmpFactories = SerdeUtils
                 .serdesToComparatorFactories(fieldSerdes, numKeyFields);
@@ -83,7 +83,7 @@
                 diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
                 valueProviderFactories, rtreePolicyType, bloomFilterFalsePositiveRate, mergePolicy, opTrackerFactory,
                 ioScheduler, ioOpCallbackProvider,
-                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length), ioDeviceId);
         LSMRTreeTestContext testCtx = new LSMRTreeTestContext(fieldSerdes, lsmTree);
         return testCtx;
     }
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..4c2e83b 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
@@ -62,6 +62,7 @@
     protected final double bloomFilterFalsePositiveRate;
 
     protected IOManager ioManager;
+    protected int ioDeviceId;
     protected IBufferCache diskBufferCache;
     protected IFileMapProvider diskFileMapProvider;
     protected IInMemoryBufferCache memBufferCache;
@@ -116,6 +117,7 @@
         memBufferCache = new DualIndexInMemoryBufferCache(new HeapBufferAllocator(), memPageSize, memNumPages);
         memFreePageManager = new DualIndexInMemoryFreePageManager(memNumPages, new LIFOMetaDataFrameFactory());
         ioManager = TestStorageManagerComponentHolder.getIOManager();
+        ioDeviceId = 0;
         rnd.setSeed(RANDOM_SEED);
     }
 
@@ -167,6 +169,10 @@
         return ioManager;
     }
 
+    public int getIODeviceId() {
+        return ioDeviceId;
+    }
+
     public IBufferCache getDiskBufferCache() {
         return diskBufferCache;
     }
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..48cc481 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
@@ -72,7 +72,7 @@
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ISerializerDeserializer[] fieldSerdes,
             IPrimitiveValueProviderFactory[] valueProviderFactories, int numKeyFields, RTreePolicyType rtreePolicyType,
             ILSMMergePolicy mergePolicy, ILSMOperationTrackerFactory opTrackerFactory,
-            ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider)
+            ILSMIOOperationScheduler ioScheduler, ILSMIOOperationCallbackProvider ioOpCallbackProvider, int ioDeviceId)
             throws Exception {
         ITypeTraits[] typeTraits = SerdeUtils.serdesToTypeTraits(fieldSerdes);
         IBinaryComparatorFactory[] rtreeCmpFactories = SerdeUtils
@@ -83,7 +83,7 @@
                 memFreePageManager, ioManager, file, diskBufferCache, diskFileMapProvider, typeTraits,
                 rtreeCmpFactories, btreeCmpFactories, valueProviderFactories, rtreePolicyType, mergePolicy,
                 opTrackerFactory, ioScheduler, ioOpCallbackProvider,
-                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length), ioDeviceId);
         LSMRTreeWithAntiMatterTuplesTestContext testCtx = new LSMRTreeWithAntiMatterTuplesTestContext(fieldSerdes,
                 lsmTree);
         return testCtx;