We had an incident where a VM hosts' disk filled up, the VMs all went unknown in the web console, but were fully functional if you were to login or use the services of one.  We couldn't migrate them so we powered them down on that host and powered them up and let ovirt choose the host for it, same as always.  However the disk image on a few of them were corrupted because once we fixed the host with the full disk, it still thought it should be running the VM.  Which promptly corrupted the disk, the error seems to be this in the logs:

We upgraded to 4.1.6 from 4.0.6 earlier in the day, I don't really think it's anything more than coincidence, but it's worrying enough to send to the community.

Regards,
Logan