I don't have a Luminous cluster at hand right now but setting max_mds
to 1 already should take care and stop MDS services. Do you have have
pinning enabled (subdirectories pinned to a specific MDS)?
Zitat von Mark Schouten <mark@xxxxxxxx>:
On Thu, Apr 29, 2021 at 10:58:15AM +0200, Mark Schouten wrote:
We've done our fair share of Ceph cluster upgrades since Hammer, and
have not seen much problems with them. I'm now at the point that I have
to upgrade a rather large cluster running Luminous and I would like to
hear from other users if they have experiences with issues I can expect
so that I can anticipate on them beforehand.
Thanks for the replies!
Just one question though. Step one for me was to lower max_mds to one.
Documentation seems to suggest that the cluster automagically moves > 1
mds'es to a standby state. However, nothing really happens.
root@osdnode01:~# ceph fs get dadup_pmrb | grep max_mds
max_mds 1
I still have three active ranks. Do I simply restart two of the MDS'es
and force max_mds to one daemon, or is there a nicer way to move two
mds'es from active to standby?
Thanks again!
--
Mark Schouten | Tuxis B.V.
KvK: 74698818 | http://www.tuxis.nl/
T: +31 318 200208 | info@xxxxxxxx
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