Hi,

> On 16 Jun 2021, at 01:33, Petr <p...@pushtip.com> wrote:
> 
> I've upgraded my Ubuntu server from 18.04.5 LTS to Ubuntu 20.04.2 LTS via 
> 'do-release-upgrade',
> during that process ceph packages were upgraded from Luminous to Octopus and 
> now ceph-mon daemon(I have only one) won't start, log error is:
> "2021-06-15T20:23:41.843+0000 7fbb55e9b540 -1 mon.target@-1(probing) e2 
> current monmap has recorded min_mon_release 12 (luminous) is >2 releases 
> older than installed 15 (octopus);
> you can only upgrade 2 releases at a time you should first upgrade to 13 
> (mimic) or 14 (nautilus) stopping."
> 
> Is there any way to get cluster running or at least get data from OSDs?

Ceph is not supported +3 releases upgrade, only +1 or +2.
I suggest to install Nautilus packages and start cluster again



k
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