Re: upgrade OSDs before mon

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On Tue, Oct 26, 2021 at 7:05 AM Boris Behrens <bb@xxxxxxxxx> wrote:
>
> Hi Yury,
> unfortunally not. It's a package installation and there are no nautilus
> packages in ubuntu 20.04 (just realised this).
>
> Now the question: downgrade ubuntu to 18.04 and start over, or keep the
> octopus OSDs in a nautilus cluster? Would be cool if the last one is
> working properly.

This is supposed to work at the RADOS level, and gets *some* testing.
But the testing around mixed-version clusters is focused on upgrade
scenarios and generally expects the monitors to be first. If it's
functioning fine now, I'd expect it to keep being okay, except...

You mentioned it's an S3 cluster. IIRC RGW is frequently unhappy with
mixed-version clusters because of the osd-side "object class" code it
relies on being a different version from the library. The upgrade
expectations there are very specific, and I don't know how the
cross-version interoperability is set to work there. But this is my
major concern. So if you can't get sign-off on somebody from that
group I'd move the OSDs back to nautilus.
-Greg

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