Hello,
We are running a pacific 16.2.10 cluster and enabled the balancer module, here
is the configuration:
[root@ceph-1 ~]# ceph balancer status
{
"active": true,
"last_optimize_duration": "0:00:00.052548",
"last_optimize_started": "Fri Nov 17 17:09:57 2023",
"mode": "upmap",
"optimize_result": "Unable to find further optimization, or pool(s) pg_num
is decreasing, or distribution is already perfect",
"plans": []
}
[root@ceph-1 ~]# ceph balancer eval
current cluster score 0.017742 (lower is better)
Here is the balancer configuration of upmap_max_deviation:
# ceph config get mgr mgr/balancer/upmap_max_deviation
5
We have two different types of OSDS, one is 7681G and another is 3840G. When I
checked our PG distribution on each type of OSD, I found the PG distribution is
not evenly, for the 7681G OSDs, the OSD distribution varies from 136 to 158;
while for the 3840G OSDs, it varies from 60 to 83, seems the
upmap_max_deviation is almost +/- 10. So I just wondering if this is expected
or do I need to change the upmap_max_deviation to a smaller value.
Thanks for answering my question.
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