- You have a Windows Server 2012 R2 -based computer with the Hyper-V role.
- You run a Windows Server 2003-based or a Windows Server 2008-based virtual machine.
- You try to back up the virtual machine by using a backup application from the Hyper-V Host.
- The Hyper-V writer on the Window Server 2012 R2 host reports the backup as succeeding.
- The VSS infrastructure uses the Microsoft Hyper-V VSS requestor to create a snapshot in the virtual machine.
- The VSS infrastructure uses the Microsoft Hyper-V VSS writer to create a snapshot on the Hyper-V host.
Because of these limitations, the Hyper-V requester that is running on Windows Server 2003 or Windows Server 2008 stops the VSS backup process following the OnThaw phase in order to skip the auto-recovery portion. This results in the guest writers reporting failure. Before aborting the backup process the virtual machine’s state is preserved. This is then used to provide constant backup for the application.
The following will be unaffected by this status:
- Restore operations or later backup requests of the virtual machine though the Hyper-V writer on the host
- Backup requests from the virtual machine that use other backup techniques such as a System State Backup together with Windows Backup
Article ID: 2952783 - Last Review: 27 Mar 2014 - Revision: 1