[ceph-users] MDS lost, Filesystem degraded and wont mount

Hello community, we are on ceph 13.2.8 - today something happenned with one MDS and cephs status tells, that filesystem is degraded. It won't mount either. I have take server with MDS, that was not working down. There are 2 more MDS servers, but they stay in "rejoin" state. Also only 1 is shown in "services", even though there are 2. Both running MDS servers have these lines in their logs: heartbeat_map is_healthy 'MDSRank' had timed out after 15 mds.beacon.mds2 Skipping beacon heartbeat to monitors (last acked 28.8979s ago); MDS internal heartbeat is not healthy! On one of MDS nodes I enabled more detailed debug, so I am getting there also: mds.beacon.mds3 Sending beacon up:standby seq 178 mds.beacon.mds3 received beacon reply up:standby seq 178 rtt 0.000999968 Makes no sense and too much stress in my head... Anyone could help please? Anton.