Re: Multi-MDS CephFS upgrades limitation

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Hello Bryan,

On Wed, Oct 6, 2021 at 6:21 PM Bryan Stillwell <bstillwell@xxxxxxxxxxx> wrote:
>
> One of the main limitations of using CephFS is the requirement to reduce the
> number of active MDS daemons to one during upgrades.  As far as I can tell this
> has been a known problem since Luminous (~2017).  This issue essentially
> requires downtime during upgrades for any CephFS cluster that needs more than
> one active MDS at all times.  I saw there were some improvements to the upgrade
> process with 16.2.6 (you no longer have to stop the standby MDSes), but it has
> me wondering if there are any plans to fix this limitation soon?

Probably Quincy, no promises.

-- 
Patrick Donnelly, Ph.D.
He / Him / His
Principal Software Engineer
Red Hat Sunnyvale, CA
GPG: 19F28A586F808C2402351B93C3301A3E258DD79D

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