Re: osd set-require-min-compat-client

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Hi Felix,

This change won't trigger any rebalancing. It will prevent older clients
from connecting, but since this isn't a crush tunable it won't directly
affect data placement.

Best,

Dan


On Wed, Nov 30, 2022, 12:33 Stolte, Felix <f.stolte@xxxxxxxxxxxxx> wrote:

> Hey guys,
>
> our ceph cluster is on pacific, but started on jewel years ago. While i
> was going through the logs of the mrg daemon i stumbled about the following
> entry:
>
> =========
> [balancer ERROR root] execute error: r = -1, detail = min_compat_client
> jewel < luminous, which is required for pg-upmap. Try 'ceph osd
> set-require-min-compat-client luminous' before using the new interface
> =========
>
> I could confirm that with `ceph osd get-require-min-compat-client` my
> value is still value. Reading the docs it looks to me, we really want to
> set this to luminous to benefit from a better pg distribution. My question
> for you is the following:
>
> Do I have to expect a major rebalancing after applying the 'ceph osd
> set-require-min-compat-client luminous‘  command, affecting my cluster IO?
>
> All my daemons are on pacific and all clients at least on nautilus.
>
> Thanks in advance and best regards
> Felix
>
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