Re: MONs not trimming

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I think it was mentioned elsewhere in this thread that there are
limitations to what upmap can do, especially in significant crush map
change situations. It can't violate crush rules (mon-enforced), and if
the same OSD shows up multiple times in a backfill then upmap can't
deal with it.

Creeping back up is a bit odd; if you have the balancer off, any
chance there's somehow also a PG split going on? What does 'ceph osd
pool ls detail' say?

Josh

On Tue, Dec 17, 2024 at 10:06 AM Janek Bevendorff
<janek.bevendorff@xxxxxxxxxxxxx> wrote:
>
> Something's not quite right yet. I got the remapped PGs down from > 4000
> to around 1300, but there it stops. When I restart the process, I can
> get it down to around 280, but there it stops and creeps back up afterwards.
>
> I have a bunch of these messages in the output:
>
> WARNING: pg 100.3d53: conflicting mapping 1068->1051 found when trying
> to map 187->1068
>
> There's maybe around 70-80 of them (definitely not 280 or 1300), any
> idea how I can fix that? The messages all point to the same pool (our
> largest one, I did not change the failure domain for this pool).
>
> > Ah, yes, we ran into that invalid json output in
> > https://github.com/digitalocean/ceph_exporter as well. I have a patch
> > I wrote for ceph_exporter that I can port over to pgremapper (that
> > does similar to what your patch does).
>
> That'd be nice!
>
>
> Janek
>
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