Hi,
Running 'health detail' on our Ceph cluster this morning, I notice a
warning about one of the pools having significantly more objects per
placement group than the cluster average.
ceph> health detail
HEALTH_WARN pool cas_backup has too few pgs
pool cas_backup objects per pg (2849) is more than 26.1376 times cluster
average (109)
For our cluster, I think this situation is more or less normal. The
mentioned pool backs an rbd service (about 1TB of data), and we also
have a number of tiny pools relating to a radosgw service. We only have
three OSDs, so we've gone with 128 placement groups as recommended in
the documentation.
I understand from http://tracker.ceph.com/issues/8103 that I could make
the warning go away by adjusting the " mon pg warn max object skew"
parameter upwards, or by setting it to zero to disable the warning
altogether.
Is there a reason this would be a bad idea, and if so, is there a more
sensible approach to dealing with the warning? I'd like to be able to
actively monitor the cluster status, and would prefer to address this
warning rather than ignore it, if possible.
Thanks,
--
Richard Gray
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