So we are running an OpenStack installation based on Folsom, but with Ceph as our underlying storage engine for volumes. This is a bit cutting edge. To make matters more bleeding, we run the Ceph OSDs on BTRFS - definitively bleeding edge, as we had various of our servers die with BTRFS related kernel panics. The advice usually given is to upgrade the BTRFS code - so we have started to migrate our Quantal (12. ...