upgrade to nautilus: "require-osd-release nautilus" required to increase pg_num

["Alexander Y. Fomichev" <git.user@xxxxxxxxx>]

Hi,

I just upgraded from mimic to nautilus(14.2.0) and stumbled upon a strange "feature".

I tried to increase pg_num for a pool. There was no errors but also no visible effect:

# ceph osd pool get foo_pool01 pg_num
pg_num: 256
# ceph osd pool set foo_pool01 pg_num 512
set pool 11 pg_num to 512
# ceph osd pool get foo_pool01 pg_num
pg_num: 256

until finally I found that
# ceph osd require-osd-release nautilus

solves this problem

Docs are very scarce about "require-osd-release" command. Something like
"Complete the upgrade by disallowing pre-Nautilus OSDs and enabling all new Nautilus-only functionality:" which gives no clue to understand why pretty old feature of increasing pg_num dosn't work. Any way I doubt that silently ignoring user commands is a good idea.

So question is: It is intentional behavior or I hit a bug.

--

Best regards.
       Alexander Y. Fomichev <git.user@xxxxxxxxx>

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