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}
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 <APtashnik@xxxxxxxxx> 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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