You need to have Navisphere Manager(not the express version) as well as the Snapshot software enabler installed on the AX4. This is in addition to the VSS provider that you have already installed on your cluster hosts. This will allow you to use DPM for hardware based snapshots.  In powerlink navigate to get the useful docs on VSS : Home > Support > Technical Documentation and Advisories > Software ~ T-Z ~ Documentation > VSS Provider Primus emc107717 and emc202636 for RLP  VSS provider can be downloaded from: Home > Support > Software Downloads and Licensing > Downloads S > SnapView        
hello!!  We ‘ve an  EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover cluster CSV's, etc. I'm wanting to figure out what I have to do to set up the VSS Provider for the SAN, so that Microsoft Data Protection Manager can use it to backup the virtual machines.   Can anyone help me figure out how to get the VSS Provider up and running?  thank you in anticipation!
Using DMP with EMC clariion SAN