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Based in my experience here are some recomendations and tips for SCDPM in a Hyper-v/CSV environment.

Recommendations :

• Install SCDPM in a x64 physical server always with the OS installed in a Raid 1. I recommend at least 8GB of Ram and 2×4 cores
• Ensure that ALL prerequisites software’s are installed on all the nodes in the cluster(IMPORTANT)
• Ensure the SCDPM Server is updated. All patches should be installed
• Have Installed a Raid 10 for the Storage Pool, as you cannot have the OS not the DPM installed on the disk that is dedicated to the storage pool, which is a set of disks on which the DPM server stores the replicas and recovery points for the protected data.
• Check if the Tape library is compatible/recognized by Windows 2008 R2 ( VERY IMPORTANT!). Don’t try to use non signed drivers. The server will freeze when you most needed it.
• Use a hardware VSS writer as you are using a CSV(IMPORTANT)
• Have System Center Monitor in place
• Install the Hyper-V role in your SCDPM Server from a command line instead of using Server Manager.  This will enable DPM to manage/automate Item Level Recovery(ILR)
• Install the SCOM agent to monitor your SCDPM server. Install the SCDPM Management pack. Monitor the SCDPM SQL Databases
• Backup the SCDPM SQL  Databases ( IMPORTANT )
• Enable the SCDPM Alerts

Tips :

• Tapes : By default you are unable to restore data from a expired tape. Also the recatalog option is disabled for expired tapes
• Page File : 0.2 percent of the combined size of all recovery point volumes, in addition to the recommended size (generally, 1.5 times the amount of RAM on the computer)