Re: MDS upgrade to Quincy

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Does cephadm automatically reduce ranks to 1 or does that have to be done
manually?

/Jimmy

On Thu, Apr 21, 2022 at 3:30 PM Patrick Donnelly <pdonnell@xxxxxxxxxx>
wrote:

> On Wed, Apr 20, 2022 at 8:29 AM Chris Palmer <chris.palmer@xxxxxxxxx>
> wrote:
> >
> > The Quincy release notes state that "MDS upgrades no longer require all
> > standby MDS daemons to be stoped before upgrading a file systems's sole
> > active MDS." but the "Upgrading non-cephadm clusters" instructions still
> > include reducing ranks to 1, upgrading, then raising it again.
>
> The instructions are correct? For both cephadm and non-cephadm
> clusters, it is necessary to reduce max_mds to 1 (ranks to 1) before
> doing an upgrade. The change noted in the release is that standby MDS
> (MDS not holding a rank) no longer need to be stopped / shutdown.
>
> > Does the new feature only apply once you have upgraded to Quincy, or do
> > the MDS upgrade notes need adjusting now? (We're upgrading from Pacific).
>
> It's only necessary to upgrade the monitors for the feature to be
> available (which is already the first thing you do when upgrading a
> cluster).
>
> --
> Patrick Donnelly, Ph.D.
> He / Him / His
> Principal Software Engineer
> Red Hat, Inc.
> GPG: 19F28A586F808C2402351B93C3301A3E258DD79D
>
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