from the docs (also important to read what pgp_num does):
http://docs.ceph.com/docs/jewel/rados/operations/placement-groups/
To set the number of placement groups in a pool, you must specify the
number of placement groups at the time you create the pool. See Create a
Pool for details. Once you’ve set placement groups for a pool, you may
increase the number of placement groups (but you cannot decrease the number
of placement groups). To increase the number of placement groups, execute
the following:
ceph osd pool set {pool-name} pg_num {pg_num}
Once you increase the number of placement groups, you must also increase
the number of placement groups for placement (pgp_num) before your cluster
will rebalance. The pgp_num will be the number of placement groups that
will be considered for placement by the CRUSH algorithm.* Increasing pg_num
splits the placement groups but data will not be migrated to the newer
placement groups until placement groups for placement*, ie. pgp_num is
increased. The pgp_num should be equal to the pg_num. To increase the
number of placement groups for placement, execute the following
ceph osd pool set {pool-name} pgp_num {pgp_num}
On Fri, Nov 4, 2016 at 9:52 AM, Andrey Ptashnik <[email protected]> wrote:
> Hello Ceph team,
>
> Is it possible to increase number of placement groups on a live system
> without any issues and data loss? If so what is the correct sequence of
> steps?
>
> Regards,
>
> Andrey Ptashnik
>
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