On 1/30/20 1:34 PM, vis...@denovogroup.org wrote:
> Iam testing failure scenarios for my cluster. I have 3 monitors. Lets say if
> mons 1 and 2 go down and so monitors can't form a quorum, how can I recover?
>
> Are the instructions at followling link valid for deleting mons 1 and 2 from
> monmap,
> https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/1.2.3/html/red_hat_ceph_administration_guide/remove_a_monitor#removing-monitors-from-an-unhealthy-cluster
>
>
> One more question - lets say I delete mons 1 and 2 from monmap. And the
> cluster has only mon 3 remaining so mon 3 has quorum. Now what happens if mon
> 1 and 2 come up? Do they join mon 3 and so there will again be 3 monitors in
> the cluster?
>
The epoch of the monmap has increased by removing mons 1 and 2 from the
map. Only mon 3 has this new map with the new epoch.
Therefor, if mon 1 and 2 boot they see the epoch of mon 3 is newer and
thus won't be able to join.
Wido
> Thanks
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