diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
index 60f82c8ff94..37e4a8b97d5 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
@@ -997,6 +997,9 @@ Release 2.8.0 - UNRELEASED
     HDFS-9797. Log Standby exceptions thrown by RequestHedgingProxyProvider
     at DEBUG Level (Inigo Goiri via asuresh)
 
+    HDFS-9773. Remove dead code related to SimulatedFSDataset in tests.
+    (Brahma Reddy Battula via aajisaka)
+
   OPTIMIZATIONS
 
     HDFS-8026. Trace FSOutputSummer#writeChecksumChunks rather than
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
index 84699a95171..40589f5e9ba 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend.java
@@ -43,7 +43,6 @@
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
-import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.FsDatasetSpi;
 import org.apache.hadoop.hdfs.server.datanode.fsdataset.impl.FsDatasetTestUtil;
 import org.apache.hadoop.io.IOUtils;
@@ -59,8 +58,6 @@
 public class TestFileAppend{
   private static final long RANDOM_TEST_RUNTIME = 10000;
 
-  final boolean simulatedStorage = false;
-
   private static byte[] fileContents = null;
 
   //
@@ -101,13 +98,7 @@ private void checkFile(DistributedFileSystem fileSys, Path name, int repl)
     }
     byte[] expected = 
         new byte[AppendTestUtil.NUM_BLOCKS * AppendTestUtil.BLOCK_SIZE];
-    if (simulatedStorage) {
-      LocatedBlocks lbs = fileSys.getClient().getLocatedBlocks(name.toString(),
-          0, AppendTestUtil.FILE_SIZE);
-      DFSTestUtil.fillExpectedBuf(lbs, expected);
-    } else {
-      System.arraycopy(fileContents, 0, expected, 0, expected.length);
-    }
+    System.arraycopy(fileContents, 0, expected, 0, expected.length);
     // do a sanity check. Read the file
     // do not check file status since the file is not yet closed.
     AppendTestUtil.checkFullFile(fileSys, name,
@@ -118,9 +109,6 @@ private void checkFile(DistributedFileSystem fileSys, Path name, int repl)
   @Test
   public void testBreakHardlinksIfNeeded() throws IOException {
     Configuration conf = new HdfsConfiguration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
     FileSystem fs = cluster.getFileSystem();
     InetSocketAddress addr = new InetSocketAddress("localhost",
@@ -186,9 +174,6 @@ public void testBreakHardlinksIfNeeded() throws IOException {
   @Test
   public void testSimpleFlush() throws IOException {
     Configuration conf = new HdfsConfiguration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     fileContents = AppendTestUtil.initBuffer(AppendTestUtil.FILE_SIZE);
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
     DistributedFileSystem fs = cluster.getFileSystem();
@@ -242,9 +227,6 @@ public void testSimpleFlush() throws IOException {
   @Test
   public void testComplexFlush() throws IOException {
     Configuration conf = new HdfsConfiguration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     fileContents = AppendTestUtil.initBuffer(AppendTestUtil.FILE_SIZE);
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
     DistributedFileSystem fs = cluster.getFileSystem();
@@ -293,9 +275,6 @@ public void testComplexFlush() throws IOException {
   @Test(expected = FileNotFoundException.class)
   public void testFileNotFound() throws IOException {
     Configuration conf = new HdfsConfiguration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
     FileSystem fs = cluster.getFileSystem();
     try {
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend2.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend2.java
index 3c72db35bd2..cd1b8510e95 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend2.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend2.java
@@ -38,7 +38,6 @@
 import org.apache.hadoop.hdfs.client.HdfsClientConfigKeys;
 import org.apache.hadoop.hdfs.protocol.LocatedBlock;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
-import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.UserGroupInformation;
@@ -59,7 +58,6 @@ public class TestFileAppend2 {
   }
 
   static final int numBlocks = 5;
-  final boolean simulatedStorage = false;
 
   private byte[] fileContents = null;
 
@@ -81,9 +79,6 @@ public class TestFileAppend2 {
   @Test
   public void testSimpleAppend() throws IOException {
     final Configuration conf = new HdfsConfiguration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     conf.setInt(DFSConfigKeys.DFS_DATANODE_HANDLER_COUNT_KEY, 50);
     fileContents = AppendTestUtil.initBuffer(AppendTestUtil.FILE_SIZE);
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
@@ -233,9 +228,6 @@ public void testSimpleAppend() throws IOException {
   @Test
   public void testSimpleAppend2() throws Exception {
     final Configuration conf = new HdfsConfiguration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     conf.setInt(DFSConfigKeys.DFS_DATANODE_HANDLER_COUNT_KEY, 50);
     fileContents = AppendTestUtil.initBuffer(AppendTestUtil.FILE_SIZE);
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend4.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend4.java
index 62f6cd2ee4d..265b510ec10 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend4.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestFileAppend4.java
@@ -43,7 +43,6 @@
 import org.apache.hadoop.hdfs.protocol.HdfsConstants;
 import org.apache.hadoop.hdfs.protocol.LocatedBlocks;
 import org.apache.hadoop.hdfs.server.datanode.DataNode;
-import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
 import org.apache.hadoop.hdfs.server.namenode.FSDirectory;
 import org.apache.hadoop.hdfs.server.namenode.INodeFile;
 import org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException;
@@ -67,7 +66,6 @@ public class TestFileAppend4 {
   MiniDFSCluster cluster;
   Path file1;
   FSDataOutputStream stm;
-  final boolean simulatedStorage = false;
 
   {
     DFSTestUtil.setNameNodeLogLevel(Level.ALL);
@@ -78,9 +76,6 @@ public class TestFileAppend4 {
   @Before
   public void setUp() throws Exception {
     this.conf = new Configuration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
 
     // lower heartbeat interval for fast recognition of DN death
     conf.setInt(DFSConfigKeys.DFS_NAMENODE_HEARTBEAT_RECHECK_INTERVAL_KEY,
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLargeBlock.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLargeBlock.java
index 08961202653..a37da35a893 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLargeBlock.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/TestLargeBlock.java
@@ -30,7 +30,6 @@
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
-import org.apache.hadoop.hdfs.server.datanode.SimulatedFSDataset;
 import org.junit.Test;
 
 /**
@@ -51,7 +50,6 @@ public class TestLargeBlock {
   // should we verify the data read back from the file? (slow)
   static final boolean verifyData = true;
   static final byte[] pattern = { 'D', 'E', 'A', 'D', 'B', 'E', 'E', 'F'};
-  static final boolean simulatedStorage = false;
 
   // creates a file 
   static FSDataOutputStream createFile(FileSystem fileSys, Path name, int repl,
@@ -177,9 +175,6 @@ public void runTest(final long blockSize) throws IOException {
     final long fileSize = blockSize + 1L;
 
     Configuration conf = new Configuration();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).build();
     FileSystem fs = cluster.getFileSystem();
     try {
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitLocalRead.java b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitLocalRead.java
index a0690039093..f4fbebcfc29 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitLocalRead.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/shortcircuit/TestShortCircuitLocalRead.java
@@ -97,7 +97,6 @@ public void before() {
 
   static final long seed = 0xDEADBEEFL;
   static final int blockSize = 5120;
-  final boolean simulatedStorage = false;
 
   // creates a file but does not close it
   static FSDataOutputStream createFile(FileSystem fileSys, Path name, int repl)
@@ -268,9 +267,6 @@ public void doTestShortCircuitReadImpl(boolean ignoreChecksum, int size,
       conf.setBoolean(
           HdfsClientConfigKeys.DFS_CLIENT_USE_LEGACY_BLOCKREADERLOCAL, true);
     }
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1)
         .format(true).build();
     FileSystem fs = cluster.getFileSystem();
@@ -399,9 +395,6 @@ public void testSkipWithVerifyChecksum() throws IOException {
         new File(sockDir.getDir(),
             "testSkipWithVerifyChecksum._PORT.sock").getAbsolutePath());
     DomainSocket.disableBindPathValidation();
-    if (simulatedStorage) {
-      SimulatedFSDataset.setFactory(conf);
-    }
     MiniDFSCluster cluster = new MiniDFSCluster.Builder(conf).numDataNodes(1)
         .format(true).build();
     FileSystem fs = cluster.getFileSystem();