Hi,

On 26.01.23 12:46, Jens Galsgaard wrote:

Setup is:
3 hosts with each 12 disks (osd/mon)
3 vm's with mon/mds/mgr

The vm's are unavailable at the moment and one of the hosts is online with 
osd/mon running.


You have only one out of six MONs running. This MON is unable to form a quorum.

Best would be to start the other MONs so that you have at least 4 running. They could form a quorum and then the cluster will respond again.

If that is not possible and you want to recover from a catastrophic failure you need to manually edit the MON map (with monmaptool) and remove all but the running MON from it. Then this MON will only see itself as active in the cluster and form the quorum.

https://docs.ceph.com/en/quincy/rados/troubleshooting/troubleshooting-mon

https://docs.ceph.com/en/quincy/rados/operations/add-or-rm-mons/#removing-monitors

Regards
--
Robert Sander
Heinlein Consulting GmbH
Schwedter Str. 8/9b, 10119 Berlin

https://www.heinlein-support.de

Tel: 030 / 405051-43
Fax: 030 / 405051-19

Amtsgericht Berlin-Charlottenburg - HRB 220009 B
Geschäftsführer: Peer Heinlein - Sitz: Berlin
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