Re: How balancer module balance data

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Hi,

For the reason you observed, I normally set upmap_max_deviation = 1 on
all clusters I get my hands on.

Cheers, Dan

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On Mon, Nov 27, 2023 at 10:30 AM <bryansoong21@xxxxxxxxx> wrote:
>
> 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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