Backup of shared vmdk
I'm thinking of setting up a high-availability file server using a Windows Server 2012 R2 cluster running on ESXi 5.5 U2. However, in order to do this the data disk (VMDK on HP MSA 1040 SAN) needs to be a physical mode RDM on a SCSI controller set to physical bus sharing. In such a configuration ESXi does not support taking snapshots of the shared VMDK. The only other option I've read about would be to use the iSCSi initiation from within the guest VMs, but again that wouldn't allow snapshots to be taken since ESXi would be unaware of the disks even existing.
Is there any way to perform a backup of such a configuration using vmProtect? Or can anyone suggest another way to have a high-availability file server? I looked at using DFS but that requires having 2 or more separate copies of the data which would defeat the purpose of using shared storage (and the MSA 1040 does not support deduplication).

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