RHEVM: Shared Disks. What does it provide ?

Hello

I have a possible use case for the new shared disk feature in 3.1 but there is little information as to what exactly it provides.

Am I right to assume it does little more than configure the disk as clustered LVM volume and makes it available to other VM's ?

I still need to put a clustered filesystem on top of it (GFS?) and create some sort of clustering mechanism (RHCS) with the ability to fence nodes , right ?

How would I fence a RHEV VM ?

Thank You