Re: another osd_pglog memory usage incident

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 >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?



-----Original Message-----
Cc: ceph-users
Subject:  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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