hi Zheng, On 8/21/19 4:32 AM, Yan, Zheng wrote: > Please enable debug mds (debug_mds=10), and try reproducing it again. please find the logs at https://www.user.tu-berlin.de/thoralf.schulze/ceph-debug.tar.xz . we managed to reproduce the issue as a worst case scenario: before snapshotting, juju-d0f708-5-lxd-1 and juju-d0f708-10-lxd-1 were the active mds's and juju-d0f708-3-lxd-1 and juju-d0f708-9-lxd-1 standbys. we created the snapshot at ~08:11:50, a little later the failover happened and juju-d0f708-5-lxd-1 and juju-d0f708-10-lxd-1 went mia. a little later still, the now-active juju-d0f708-3-lxd-1 and juju-d0f708-9-lxd-1 mds's dropped out of the cluster as well. we started to restart all mds daemons at ~08:16. thank you very much & with kind regards, t.
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