Comment 30 for bug 1539253

Verified on MOS 8.0 + MU4 updates.

Before there was error messages on compute nodes:
10.109.15.6
<131>Feb 13 13:07:41 node-4 ceilometer-polling: 2017-02-13 13:07:41.609 29729 ERROR ceilometer.compute.pollsters.disk [-] Ignoring instance instance-00000001 (ea136894-41d8-486a-a8ed-dd227586a601) : internal error: missing storage backend for network files using rbd protocol
2017-02-13 13:07:41.609 29729 ERROR ceilometer.compute.pollsters.disk libvirtError: internal error: missing storage backend for network files using rbd protocol
With updates log doesn't contain errors.