pg_num (pgp_num) for default pools

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Hello!

How is pg_num (pgp_num) for default pools (data, metadata and rbd) is calculated?

According to following:
http://ceph.com/docs/master/rados/operations/placement-groups

If my cluster has 30 OSDs and 3 replica per Object (osd pool default size = 3), I should be creating new pools with pg_num = pgp_num = 1000..  But, default pools on my cluster are:

$ ceph osd pool get data pg_num
pg_num: 1984
$ ceph osd pool get metadata pg_num
pg_num: 1984
$ ceph osd pool get rbd pg_num
pg_num: 1984

Is there a different formula used for default pools?

Thanks!
Amit

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