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

Update:
Microsoft has released a hotfix to solve this problem
Hotfix Package 4 for Microsoft Application Virtualization 4.6 RTM: October 2010
https://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:

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