[Linux-cluster] Shared storage across clustered VMs?

[Jeff Karpinski]

I've got a 4 node cluster back-ended with iSCSI storage that's happily 
running 20 or so VMs. I now have a request to present some shared 
storage across several of the VMs and am wondering what's the best way 
to accomplish this. GFS2? Can VMs even communicate back with the cluster 
for lock_dlm to work?

Interested in how others have skinned this cat...