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Cinder volumes all of the sudden go read-only.

So we had a power outage at work that ran past the battery time so the Openstack cluster hard shut-down. Everything comes back up fine but now after a week of the cluster running the Cinder volumes automatically go into read-only mode (this has happened 3 times already). When I list the volumes in cinder they show that they are not read-only. The only way I have been able to resolve the issue is by logging into every VM and remounting the volumes. I checked the cinder logs and they have no errors or strange output. Anyone seen this before or have any idea where I can start debugging this?