Cloudtidings.com

If your SAN vendor does not have hardware VSS providers, you can use software snapshots to back up your virtual machines.

We recommend that virtual machines deployed on CSV should be backed up serially.

There are two aspects to serialization of backup jobs in a CSV environment:

• Serializing virtual machine backups on a per node basis.

To ensures that only one backup job will run at a time on a Hyper-V host, create the following registry key on the DPM server:

• Serializing virtual machine backups on a per CSV LUN basis.

This form of serialization limits the number of virtual machine backups happening on a single CSV LUN. This is done by creating a DataSourceGroups.xml file and placing it in the DPM server at %PROGRAMFILES%Microsoft DPMDPMConfig. This file provides DPM with information about the CSV virtual machine deployment configuration/distribution on the various CSV LUN so as to serialize the backups that happen per CSV LUN.

For more information about how to generate the file http://technet.microsoft.com/en-us/library/ff634192.aspx