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VSS Backup does not work when App-V is installed and drive Q is created

VSS Backup does not work when App-V is installed and drive Q is created

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Update:
Microsoft has released a hotfix to solve this problem
Hotfix Package 4 for Microsoft Application Virtualization 4.6 RTM: October 2010
http://support.microsoft.com/kb/2432513

 

This is a server backup issue. On a Windows Server, you install App-v 4.6 and Q(or other drvie letter) drive will be created. You are trying to use Windows Server Backup on host machine to perform online backup of Hyper-V guest machine, and trying to use the commands "vssadmin list volumes" or "vssadmin list shadowstorage", but you get the following error:

"Error: The shadow copy provider had an unexpected error while trying to process the specified command."

Right clicking on the C:\ volume and clicking "Configure Shadow Copies...", the following error is shown:

"Failed to retrieve volumes that are eligible for shadow copies.

Error 0x8004230f: The shadow copy provider had an unexpected error while trying to process the specified operation."

Additionally, in the event log, you could notice the VSS event 12293, 8193, 12348.

 

Background:

What is Q drive

Q drive is the location that you can save files while you are sequencing an application from App-v.

The App-V drive you specify must be accessible on targeted computers. If drive Q is not accessible, you can choose a different drive letter.

 

This issue is actually caused by the additional Q drive.

The Q drive created by App-V is not NTFS which prevent a backup from being performed.

 

Uninstall App-V 4.6 can resolve it.

 

More information:

All disks being used by the virtual machine are configured within the guest operating system as NTFS-formatted basic disks. Virtual machines that use dynamic disks or the FAT32 file system prevent an online backup from being performed.

See details at:

http://blogs.technet.com/b/virtualization/archive/2008/08/29/backing-up-hyper-v-virtual-machines.aspx

Comments
  • That hotfix doesn't resolve the problem.  We opened a case with MS support and they said it's a known issue and will not be fixed because it would require a complete overhaul of App-V.

  • Confirming: The HF doesn't help. But see this blog for a fix that DOES: blog.gridmetric.com/.../enabling-service-process-access-to-appv-ve

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