On 2018-02-28T02:38:34, Patrick Donnelly <pdonnell@xxxxxxxxxx> wrote:
> I think it will be necessary to reduce the actives to 1 (max_mds -> 1;
> deactivate other ranks), shutdown standbys, upgrade the single active,
> then upgrade/start the standbys.
>
> Unfortunately this didn't get flagged in upgrade testing. Thanks for
> the report Dan.
This means that - when the single active is being updated - there's a
time when there's no MDS active, right?
Is another approach theoretically feasible? Have the updated MDS only go
into the incompatible mode once there's a quorum of new ones available,
or something?
(From the point of view of a distributed system, this is double plus
ungood.)
Regards,
Lars
--
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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