In support of RBD-backed iSCSI via tcmu-runner+librbd, tcmu-runner will need to be able to acquire the exclusive lock and break the lock of peers after an ALUA failover.
Upstream PRs: https://github.com/ceph/ceph/pull/12625 https://github.com/ceph/ceph/pull/12639
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2017-0514.html