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Xenial currently ships with Ceph 10.2.2 which has a known issue that can result in updated images failing to be refreshed when the cluster is overloaded and drops update notifications [1]. This is most likely the cause for recent Ceph gate failures [2]. Disabling the new Jewel+ default image feature of exclusive-lock (revert to Hammer default behavior) should be a workaround for this issue. The RBD default features can be overridden via CEPH_RBD_DEFAULT_FEATURES [1] http://tracker.ceph.com/issues/16404 [2] https://bugs.launchpad.net/cinder/+bug/1627220 Change-Id: Id7fab306e918ba7566ebe2a765d4345fea6c5653 Closes-Bug: #1627878 Signed-off-by: Jason Dillaman <dillaman@redhat.com>