Install at least these two hotfixes on Hyper-V R2 servers:
KB975354 A Hyper-V rollup package dealing with parallel backups on same cluster shared volumes and VM’s hosted by different servers; Avoiding data truncation as a result of simultaneous backup of VM from host and from within virtual machine; properly restoring a VM with snapshots to another location
KB975921 You may be unable to perform certain disk-related operations after an exception when a hardware provider tries to create a snapshot in Windows Server 2008 R2 or Win 7.
Although not specifically related to Hyper-V and DPM2010, I also install hotfix KB974909 which solves loss of the network connection within a virtual machine with heavy outgoing network traffic and many concurrent network connections. This could easily be the case when a VM level backup is being conducted.
There is also a list of tested hardware VSS providers:
I may have a chance to test the HP LeftHand VSS hardware provider, which is not yet on this list. The HP EVA 4×00, 6×00 and 8×00 is on the list by the way.
A comprehensive list of Windows updates and hotfixes for Hyper-V and Hyper-V R2 can be found here:
If you need to update your Hyper-V servers, you might just as well include this recent security update:
Microsoft Security Bulletin MS10-010 – Important
Vulnerability in Windows Server 2008 Hyper-V Could Allow Denial of Service (977894)
When you try to protect VM’s on a Hyper-V R2 clusters with DPM2010 RC you now get a warning if the required hotfixes are not installed.
This is very helpful!