Re: slow requests due to scrubbing of very small pg

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On Wed, Jul 3, 2019 at 4:47 PM Luk <skidoo@xxxxxxx> wrote:


this pool is that 'big' :

[root@ceph-mon-01 ~]# rados df | grep -e index -e WR
POOL_NAME                  USED    OBJECTS CLONES COPIES   MISSING_ON_PRIMARY UNFOUND DEGRADED RD_OPS      RD      WR_OPS      WR     
default.rgw.buckets.index       0B   31763      0    95289                  0       0        0   147679875 3.88TiB  8014040021      0B


You are running Luminous which doesn't account metadata properly here. 31763 objects in an an rgw index pool is a non-trivial size.

However, scrubbing that shouldn't be a problem for a properly configured cluster (i.e., no gigantic shards). Have you tried to increase osd_scrub_sleep?

--
Paul Emmerich

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[root@ceph-mon-01 ~]# ceph df | grep -e index -e N
    NAME                           ID     USED        %USED     MAX AVAIL     OBJECTS
    default.rgw.buckets.index      20          0B         0       37.0TiB       31763
[root@ceph-mon-01 ~]#


I don't think it should have such big problem during scrubing...

--
Regards
Lukasz

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