On Fri, Oct 9, 2020 at 3:12 PM Marc Roos <M.Roos(a)f1-outsourcing.eu> wrote:
1. The pg log contains 3000 entries by default (on
nautilus). These
3000 entries can legitimately consume gigabytes of ram for some
use-cases. (I haven't determined exactly which ops triggered this
today).
How can I check how much ram my pg_logs are using?
ceph daemon osd.x dump_mempools | jq .mempool.by_pool.osd_pglog
>
>
>
> -----Original Message-----
> Cc: ceph-users
> Subject: [ceph-users] Re: another osd_pglog memory usage incident
>
> On 09.10.20 13:55, Dan van der Ster wrote:
> [...]
> > I also noticed a possible relationship with scrubbing -- One week ago
> > we increased to osd_max_scrubs=5 to clear out a scrubbing backlog; I
> > wonder if the increased read/write ratio somehow led to an exploding
> > buffer_anon. Do things stabilize on your side if you temporarily
> > disable scrubbing?
>
> During the worst periods, we had disabled scrubbing. When we re-enabled,
> we had our write-job to mitigate the problems. And currently, scrub load
> is low. So I cannot tell, but it is very plausible.
>
> Cheers
> Harry
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>