Hi,

as this seems to be an issue only in the specific environment, today i fixed 
the issue by stopping the remaining octopus mon. After stopping the octopus 
mon, the both pacific mon's were able to form a quorum. After a manual redeploy 
(with pacific) of the last octopus mon the issue was fixed and i could start 
the upgrade again for the other daemons on octopus (all osds and mds).

Maybe someone in future has a similar issue and this idea helps.

Regards,
Michael

-----Ursprüngliche Nachricht-----
Von: Michael Wodniok 
Gesendet: Donnerstag, 12. August 2021 15:08
An: ceph-users@ceph.io
Betreff: Not able to reach quorum during update

Hi,

during upgrade from Octopus (15.2.13) to Pacific (16.2.4) I was not able to 
complete the upgrade.

I've upgraded using the `ceph orch upgrade start` command. After one mon was 
upgrade, the second upgraded one is not more able to form a quorum, looping 
following messages in its journal:

Aug 12 14:32:04 ceph-node2 bash[4006943]: debug 2021-08-12T12:32:04.680+0000 
7f2072ecd700  0 log_channel(cluster) log [INF] : mon.ceph-node2 calling monitor 
election Aug 12 14:32:04 ceph-node2 bash[4006943]: debug 
2021-08-12T12:32:04.680+0000 7f2072ecd700  1 paxos.2).electionLogic(356485) 
init, last seen epoch 356485, mid-election, bumping
Aug 12 14:32:04 ceph-node2 bash[4006943]: debug 2021-08-12T12:32:04.704+0000 
7f2072ecd700  1 mon.ceph-node2@2(electing) e12 collect_metadata sda:  no unique 
device id for sda: fallback method has model 'Virtual disk    ' but no serial'

The cluster has currently three mons, one is upgraded and works, one is not 
upgraded but also works and the third one loops (and was upgraded). As there is 
no specific error I do not have any idea how to fix this behavior. As it breaks 
the work of the cluster itself I've masked the "defective" mon to not start. 
However this state is everything but sane.

Are there some hints how to find the issue?

Kind Regards,
Michael

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