We are currently testing and working out our options for backing up a RHEL 6.7 VM (Can upgrade to 7.2 if need be), this VM has RDM's mounted with Oracle GRID disks and ASM.
For some reason we can't use Virtual RDM because the disks can't be seen or accessed but switching to Physical fixes this and it works, I understand that we can't take snapshots of Physical compatibility mode RDM's but I'm unsure why we can't set it to Virtual..
We are using an EMC VNX for storage by the way!
Would anyone be able to shed some light on this please? Possible workarounds or other methods that we could use?