pg_num as power of two adjustment: only downwards?

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Hi,


After upgrading to ceph 14.2.8 I started getting the "1 pool(s) have
non-power-of-two pg_num" warning.

The offending pool had 100 pgs. I tried to adjust it to 128 but it didn't work:

# ceph osd pool set default.rgw.offending pgp_num 128
Error EINVAL: specified pgp_num 128 > pg_num 100

It only worked downwards:

# ceph osd pool set default.rgw.offending pgp_num 64
set pool 7 pgp_num to 64

Is that expected?

And having reduced my pg_num to 64 (isn't it to small?) should I be
prepared for problems in the future?


Regards,

Rodrigo Severo
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