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I think my wording is not ok... What we want is a shared volume between our Compute Node, so that the VM data disks located on each server under /var/lib/nova/instances gets shared. We want to avoid that during live migration the disk must be copied from the source node to the target node.

Is it possible to create a shared volume with a cluster filesystem e.g. OCFS2 and mount via FC to /var/lib/nova/instances on every Compute Node?