How do i check the number of placement groups on a ceph monitor node?
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Link: http://docs.ceph.com/docs/master/rados/operations/placement-groups/
Placement groups is a collective group of objects. The number is 64. To check this run the following command:
$ ceph osd dump | grep -i pool pool 0 'rbd' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 64 pgp_num 64 last_change 1 flags hashpspool stripe_width 0
To increase.
$ ceph osd pool set rbd pg_num 128
Verify
$ ceph osd dump | grep -i pool pool 0 'rbd' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 128 pgp_num 64 last_change 20 flags hashpspool stripe_width 0
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