why set pg_num do not update pgp_num

[xiang.dai@xxxxxxxxxxx]

Hi!

I use ceph 13.2.1 (5533ecdc0fda920179d7ad84e0aa65a127b20d77) mimic (stable), and find that:

When expand whole cluster, i update pg_num, all succeed, but the status is as below:

  cluster:
    id:     41ef913c-2351-4794-b9ac-dd340e3fbc75
    health: HEALTH_WARN
            3 pools have pg_num > pgp_num

Then i update pgp_num too, warning miss.

What makes me confused is that when i create whole cluster at first time,

i use "ceph osd create pool pool_name pg_num", the pgp_num is auto equal to pg_num.

But "ceph osd set pool pool_name pg_num" not.

Why does this design?

Why do not auto update pgp_num when update pg_num?

Thanks

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