[ovirt-users] Unsupported Cluster with oVirt question

Hi, I have two questions about an oVirt setup. I have 3 nodes connected to a SAN storage via FC and all VMs are kept in this SAN. From the SAN I have mounted two partitions to each of these nodes and these partitions are in an OCFS2 cluster setup. I am planning to export these partitions and create NFS Domain storage in oVirt. Is there any better way considering this setup? my second question is, in the event that one of the nodes is failing, is there thing I can do to prevent VMs running on that failing node not to fail? Regards