--- a/plugins/storage/volume/storpool/src/main/java/com/cloud/hypervisor/kvm/storage/StorPoolStoragePool.java
+++ b/plugins/storage/volume/storpool/src/main/java/com/cloud/hypervisor/kvm/storage/StorPoolStoragePool.java
@@ -16,11 +16,13 @@
 // under the License.
 package com.cloud.hypervisor.kvm.storage;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
 import org.apache.cloudstack.utils.qemu.QemuImg.PhysicalDiskFormat;
 
+import com.cloud.hypervisor.kvm.resource.LibvirtVMDef;
 import com.cloud.storage.Storage;
 import com.cloud.storage.Storage.StoragePoolType;
 
@@ -35,6 +37,11 @@ public class StorPoolStoragePool implements KVMStoragePool {
     private String _sourceDir;
     private String _localPath;
 
+    private static final List<LibvirtVMDef.DiskDef.DiskBus> supportedBusTypes = Arrays.asList(
+            LibvirtVMDef.DiskDef.DiskBus.VIRTIO,
+            LibvirtVMDef.DiskDef.DiskBus.SCSI
+    );
+
     public StorPoolStoragePool(String uuid, String host, int port, StoragePoolType storagePoolType, StorageAdaptor storageAdaptor) {
         _uuid = uuid;
         _sourceHost = host;
@@ -166,4 +173,11 @@ public class StorPoolStoragePool implements KVMStoragePool {
     public Map<String, String> getDetails() {
         return null;
     }
+
+    public void customizeLibvirtDiskDef(LibvirtVMDef.DiskDef disk) {
+        if (!supportedBusTypes.contains(disk.getBusType())) {
+            return;
+        }
+        disk.setDiscard(LibvirtVMDef.DiskDef.DiscardType.UNMAP);
+    }
 }