diff --git a/engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/SnapshotServiceImpl.java b/engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/SnapshotServiceImpl.java
index f1a7d746ae8..3b456cef069 100644
--- a/engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/SnapshotServiceImpl.java
+++ b/engine/storage/snapshot/src/org/apache/cloudstack/storage/snapshot/SnapshotServiceImpl.java
@@ -313,6 +313,10 @@ public class SnapshotServiceImpl implements SnapshotService {
         if (result.isFailed()) {
             try {
                 destSnapshot.processEvent(Event.OperationFailed);
+                //if backup snapshot failed, mark srcSnapshot in snapshot_store_ref as failed also
+                srcSnapshot.processEvent(Event.DestroyRequested);
+                srcSnapshot.processEvent(Event.OperationSuccessed);
+
                 srcSnapshot.processEvent(Snapshot.Event.OperationFailed);
             } catch (NoTransitionException e) {
                 s_logger.debug("Failed to update state: " + e.toString());
diff --git a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServerStorageProcessor.java b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServerStorageProcessor.java
index dd26861deee..d5ef3346adf 100644
--- a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServerStorageProcessor.java
+++ b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServerStorageProcessor.java
@@ -31,23 +31,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.UUID;
 
-import org.apache.log4j.Logger;
-import org.apache.xmlrpc.XmlRpcException;
-
-import com.xensource.xenapi.Connection;
-import com.xensource.xenapi.Host;
-import com.xensource.xenapi.PBD;
-import com.xensource.xenapi.Pool;
-import com.xensource.xenapi.SR;
-import com.xensource.xenapi.Types;
-import com.xensource.xenapi.Types.BadServerResponse;
-import com.xensource.xenapi.Types.VmPowerState;
-import com.xensource.xenapi.Types.XenAPIException;
-import com.xensource.xenapi.VBD;
-import com.xensource.xenapi.VDI;
-import com.xensource.xenapi.VM;
-import com.xensource.xenapi.VMGuestMetrics;
-
 import org.apache.cloudstack.storage.command.AttachAnswer;
 import org.apache.cloudstack.storage.command.AttachCommand;
 import org.apache.cloudstack.storage.command.AttachPrimaryDataStoreAnswer;
@@ -66,6 +49,8 @@ import org.apache.cloudstack.storage.datastore.protocol.DataStoreProtocol;
 import org.apache.cloudstack.storage.to.SnapshotObjectTO;
 import org.apache.cloudstack.storage.to.TemplateObjectTO;
 import org.apache.cloudstack.storage.to.VolumeObjectTO;
+import org.apache.log4j.Logger;
+import org.apache.xmlrpc.XmlRpcException;
 
 import com.cloud.agent.api.Answer;
 import com.cloud.agent.api.CreateStoragePoolCommand;
@@ -88,6 +73,19 @@ import com.cloud.utils.exception.CloudRuntimeException;
 import com.cloud.utils.storage.encoding.DecodedDataObject;
 import com.cloud.utils.storage.encoding.DecodedDataStore;
 import com.cloud.utils.storage.encoding.Decoder;
+import com.xensource.xenapi.Connection;
+import com.xensource.xenapi.Host;
+import com.xensource.xenapi.PBD;
+import com.xensource.xenapi.Pool;
+import com.xensource.xenapi.SR;
+import com.xensource.xenapi.Types;
+import com.xensource.xenapi.Types.BadServerResponse;
+import com.xensource.xenapi.Types.VmPowerState;
+import com.xensource.xenapi.Types.XenAPIException;
+import com.xensource.xenapi.VBD;
+import com.xensource.xenapi.VDI;
+import com.xensource.xenapi.VM;
+import com.xensource.xenapi.VMGuestMetrics;
 
 public class XenServerStorageProcessor implements StorageProcessor {
     private static final Logger s_logger = Logger.getLogger(XenServerStorageProcessor.class);
@@ -488,11 +486,15 @@ public class XenServerStorageProcessor implements StorageProcessor {
                 Boolean isISCSI = IsISCSI(type);
                 String snapshotParentUUID = getVhdParent(conn, srUUID, snapshotUUID, isISCSI);
 
-                String preSnapshotParentUUID = getVhdParent(conn, srUUID, preSnapshotUUID, isISCSI);
-                if( snapshotParentUUID != null && snapshotParentUUID.equals(preSnapshotParentUUID)) {
-                    // this is empty snapshot, remove it
-                    snapshot.destroy(conn);
-                    snapshotUUID = preSnapshotUUID;
+                try {
+                    String preSnapshotParentUUID = getVhdParent(conn, srUUID, preSnapshotUUID, isISCSI);
+                    if( snapshotParentUUID != null && snapshotParentUUID.equals(preSnapshotParentUUID)) {
+                        // this is empty snapshot, remove it
+                        snapshot.destroy(conn);
+                        snapshotUUID = preSnapshotUUID;
+                    }
+                } catch(Exception e) {
+                    s_logger.debug("Failed to get parent snapshot", e);
                 }
             }
             SnapshotObjectTO newSnapshot = new SnapshotObjectTO();
@@ -1328,6 +1330,8 @@ public class XenServerStorageProcessor implements StorageProcessor {
                         }
                     }
                 } catch (Exception e) {
+                    s_logger.debug("Failed to get parent snapshots, take full snapshot", e);
+                    fullbackup = true;
                 }
             }