Virtual Server 2005 Virtual Machine backup fails generating Event ID 1034 "The VSS writer for Virtual Server failed during the PostBackup phase"

Article:TECH66994  |  Created: 2009-01-28  |  Updated: 2009-01-28  |  Article URL http://www.symantec.com/docs/TECH66994
Article Type
Technical Solution


Environment

Issue



Virtual Server 2005 Virtual Machine backup fails generating Event ID 1034 "The VSS writer for Virtual Server failed during the PostBackup phase"

Error



V-79-57344-65233 - AOFO: Initialization failure on: "VRTSRV::\\servername Virtual?Machine\VM". Advanced Open File Option used: Microsoft Volume Shadow Copy Service (VSS). Snapshot provider error (0xE000FED1): A failure occurred querying the Writer status. Check the Windows Event Viewer

Solution



Event Type: Error
Event Source: Virtual Server
Event Category: VSS Writer
Event ID: 1034
Description:
The VSS writer for Virtual Server failed during the PostBackup phase, during the mounting of disk \\?\Servername\Device\HarddiskVolumeShadowCopy1\Virtual_Servers\Servername.vhd for virtual machine VM. The disk did not come online within 5 minutes. Confirm that the vhd mount driver in installed correctly and is able to mount virtual hard disks.


Cause:

This occurs when the Volume Shadow Copy Services cannot communicate with VHD mount drivers during the snapshot process causing  the error above to be generated.


Solution:

Confirm whether VHD mount drivers are installed if this is an initial setup of Virtual Server backup. If VHD mount is already installed, try reinstalling it per the following steps to potentially resolve the backup failure:

How to reinstall the VHD mount drivers

1. Go to Start | Settings | Control Panel | Add and Remove Program.

2. Locate the Microsoft Virtual Server 2005 in the list installed programs.

3. Highlight the Virtual Server 2005 and click Change.  This will open a screen for Custom Setup Changes as shown in Figure 1.
Figure 1
 

4. Click NEXT

5. At the next prompt, select the Custom option and click Next.

Figure 2
 

6. Deselect the option for VHD Mount as shown in the Figure 3 and click Next.

Figure3
 

7. Click Install at the next prompt. This will uninstall the VHD mount drivers.

8. Reboot the server.

9. Perform steps 1 thru 4 again, select the VHD mount drivers, and re-install the VHD mount components.

10. Run a backup of Virtual Machine to test.

Note: If the problem persists after the reinstall, then please contact Microsoft to ensure VHD images can be manually mounted using VHD mount commands.

For more information about VHD mount commands please refer to the following Microsoft Article.
 http://technet.microsoft.com/en-us/library/cc708295.aspx


Supplemental Materials

SourceEvent ID
Value1034
DescriptionThe VSS writer for Virtual Server failed during the PostBackup phase, during the mounting of disk

SourceUMI
ValueV-79-32772-8984
DescriptionThe VSS Writer failed, but the operation can be retried


Legacy ID



317875


Article URL http://www.symantec.com/docs/TECH66994


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