Thank you very much! This solution helped:
Stop all MDS, then:
# rados -p cephfs_metadata_pool rm mds0_openfiles.0
then start one MDS.
We are back online. Amazing!!! :)
On 04.12.2020 12:20, Dan van der Ster wrote:
Please also make sure the mds_beacon_grace is high on the mon's too.
it doesn't matter which mds you select to be the running one.
Is the processing getting killed, restarted?
If you're confident that the mds is getting OOM killed during rejoin
step, then you might find this useful:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2018-August/028964.html
Stop all MDS, then:
# rados -p cephfs_metadata_pool rm mds0_openfiles.0
then start one MDS.
-- Dan
On Fri, Dec 4, 2020 at 11:05 AM Anton Aleksandrov <anton@xxxxxxxxxxxxxx> wrote:
Yes, MDS eats all memory+swap, stays like this for a moment and then
frees memory.
mds_beacon_grace was already set to 1800
Also on other it is seen this message: Map has assigned me to become a
standby.
Does it matter, which MDS we stop and which we leave running?
Anton
On 04.12.2020 11:53, Dan van der Ster wrote:
How many active MDS's did you have? (max_mds == 1, right?)
Stop the other two MDS's so you can focus on getting exactly one running.
Tail the log file and see what it is reporting.
Increase mds_beacon_grace to 600 so that the mon doesn't fail this MDS
while it is rejoining.
Is that single MDS running out of memory during the rejoin phase?
-- dan
On Fri, Dec 4, 2020 at 10:49 AM Anton Aleksandrov <anton@xxxxxxxxxxxxxx> wrote:
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.
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