sles 11 sp1 vm's sharing storage on xen ha cluster

would like our virtual machines (sles11 sp1) hosted on xen ha cluster to share storage via ocfs2
some background
our ha cluster uses ocfs2 to provide storage for virtual machine images
we have a number of sles 11 vm's, w2008server, and multiple oes2 vm's in the cluster
questions:
we would like a couple of our virtual machines to share storage
with ocfs2 volumes

what do the virtual machines need other than adding the ocfs2 packages?

do we need a cluster resource for the ocfs2 storage?
should there be some constraints at the cluster level as well?

is there any documentation on this that someone could point us to?


thanks
Wray