I noticed a similar issue tonight. Still looking into the details, but here are the client logs I Oct 9 19:27:59 mon5-cx kernel: libceph: mds0 ***:6800 socket closed (con state OPEN) Oct 9 19:28:01 mon5-cx kernel: libceph: mds0 ***:6800 connection reset Oct 9 19:28:01 mon5-cx kernel: libceph: reset on mds0 Oct 9 19:28:01 mon5-cx kernel: ceph: mds0 closed our session Oct 9 19:28:01 mon5-cx kernel: ceph: mds0 reconnect start Oct 9 19:28:01 mon5-cx kernel: ceph: mds0 reconnect denied Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff9109011c9980 1099517142146 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff91096cc788d0 1099517142307 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff9107da741f10 1099517142312 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff9109d5c40e60 1099517141612 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff9108c9337da0 1099517142313 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff9109d5c70340 1099517141565 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff910955acf810 1099517141792 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff91095ff56cf0 1099517142006 Oct 9 19:28:01 mon5-cx kernel: ceph: dropping dirty+flushing Fw state for ffff91096cc7f280 1099517142309 Oct 9 19:28:01 mon5-cx kernel: libceph: mds0 ***:6800 socket closed (con state NEGOTIATING) Oct 9 19:28:02 mon5-cx kernel: ceph: mds0 rejected session Oct 9 19:28:02 mon5-cx monit: Lookup for '/srv/repos' filesystem failed -- not found in /proc/self/mounts Oct 9 19:28:02 mon5-cx monit: Filesystem '/srv/repos' not mounted Oct 9 19:28:02 mon5-cx monit: 'repos' unable to read filesystem '/srv/repos' state ... Oct 9 19:28:09 mon5-cx kernel: ceph: get_quota_realm: ino (1.fffffffffffffffe) null i_snap_realm Oct 9 19:28:24 mon5-cx kernel: ceph: get_quota_realm: ino (1.fffffffffffffffe) null i_snap_realm Oct 9 19:28:39 mon5-cx kernel: ceph: get_quota_realm: ino (1.fffffffffffffffe) null i_snap_realm ... Oct 9 21:27:09 mon5-cx kernel: ceph: get_quota_realm: ino (1.fffffffffffffffe) null i_snap_realm Oct 9 21:27:24 mon5-cx kernel: ceph: get_quota_realm: ino (1.fffffffffffffffe) null i_snap_realm Oct 9 21:27:27 mon5-cx monit: Lookup for '/srv/repos' filesystem failed -- not found in /proc/self/mounts Oct 9 21:27:27 mon5-cx monit: Filesystem '/srv/repos' not mounted Oct 9 21:27:27 mon5-cx monit: 'repos' unable to read filesystem '/srv/repos' state Oct 9 21:27:27 mon5-cx monit: 'repos' trying to restart