Thank you for your answer. Do you have any specifics on which thread you're talking about? Would be very interested to read about a success story, because I fear that if I update the other node that the whole cluster comes down.

Am 11.04.2018 um 10:47 schrieb Marc Roos:
I think you have to update all osd's, mon's etc. I can remember running
into similar issue. You should be able to find more about this in
mailing list archive.

-----Original Message-----
From: Ranjan Ghosh []
Sent: woensdag 11 april 2018 16:02
To: ceph-users
Subject: [ceph-users] Cluster degraded after Ceph Upgrade 12.2.1 =>

Hi all,

We have a two-cluster-node (with a third "monitoring-only" node). Over
the last months, everything ran *perfectly* smooth. Today, I did an
Ubuntu "apt-get upgrade" on one of the two servers. Among others, the
ceph packages were upgraded from 12.2.1 to 12.2.2. A minor release
update, one might think. But, to my surprise, after restarting the
services, Ceph is now in degraded state :-( (see below). Only the first
node - which ist still on 12.2.1 - seems to be running. I did a bit of
research and found this:

I did set "mon_max_pg_per_osd = 300" to no avail. Don't know if this is
the problem at all.

Looking at the status it seems we have 264 pgs, right? When I enter
"ceph osd df" (which I found on another website claiming it should print
the number of PGs per OSD), it just hangs (need to abort with Ctrl+C).

Hope anybody can help me. The cluster know works with the single node,
but it is definively quite worrying because we don't have redundancy.

Thanks in advance,


root@tukan2 /var/www/projects # ceph -s
      id:     19895e72-4a0c-4d5d-ae23-7f631ec8c8e4
      health: HEALTH_WARN
              insufficient standby MDS daemons available
              Reduced data availability: 264 pgs inactive
              Degraded data redundancy: 264 pgs unclean

      mon: 3 daemons, quorum tukan1,tukan2,tukan0
      mgr: tukan0(active), standbys: tukan2
      mds: cephfs-1/1/1 up  {0=tukan2=up:active}
      osd: 2 osds: 2 up, 2 in

      pools:   3 pools, 264 pgs
      objects: 0 objects, 0 bytes
      usage:   0 kB used, 0 kB / 0 kB avail
      pgs:     100.000% pgs unknown

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