[ovirt-users] How to make oVirt + GlusterFS bulletproof

Hi Guys, I had a situation 2 times that due to unexpected power outage something went wrong and VMs on glusterfs where not recoverable. Gluster heal did not help and I could not start the VMs any more. Is there a way to make such setup bulletproof? Does it matter which volume type I choose - raw or qcow2? Or thin provision versus reallocated? Any other advise?