Comment 2 for bug 1714556

During the time that Cinder Volume was down, was the host where Cinder volume service was running able to access the Ceph cluster from the command line?

If it was, then this is probably related to the stats gathering confusion and performance issues we've been having [1][2][3][4] in the RBD driver that will very likely get fixed with the generic stats bug fix [5][6].

PS: By the logs I'm guessing this is the Ocata release.

[1] https://bugs.launchpad.net/cinder/+bug/1649956
[2] https://review.openstack.org/#/c/410884/
[3] https://bugs.launchpad.net/cinder/+bug/1704104
[4] https://review.openstack.org/#/c/483298/
[5] https://bugs.launchpad.net/cinder/+bug/1706060
[6] https://review.openstack.org/#/c/486734/