If you use Windows Server Backup or any other VSS aware backup utility you should make sure and pick up KB956697 – Windows Server 2008 Hyper-V VSS writer is not used during a backup job because of corrupted or invalid virtual machine configuration files. next time we should go for a shorter title…

The basic issue is that if you have a single invalid or corrupted configuration file none of the virtual machines will be backed up properly on that server.  I have also seen this get triggered by anti-virus or other utilities so the long and short is if you backup your servers you should make sure you have this update.

 

Taylor Brown
Hyper-V Integration Test Lead
http://blogs.msdn.com/taylorb

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