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You are correct, you do not need to wait for the rebalance to finish before continuing.
There is a lot of information about increasing your pg_num on a production system. The general concensus it to not increase it by more than 256 at a time. That is to prevent too much peering to happen at once.
From: ceph-users [ceph-users-bounces@xxxxxxxxxxxxxx] on behalf of Andrey Ptashnik [APtashnik@xxxxxxxxx]
Sent: Friday, November 04, 2016 11:10 AM To: Vasu Kulkarni Cc: ceph-users@xxxxxxxxxxxxxx Subject: Re: [ceph-users] Adjust PG PGP placement groups on the fly Hi Vasu,
Thank you for your input! I was very hesitant in changing those on a live system.
As I understand I don’t need to wait for a cluster to re-balance between PG and PGP commands, right?
Regards,
Andrey Ptashnik
From: Vasu Kulkarni <vakulkar@xxxxxxxxxx>
Date: Friday, November 4, 2016 at 12:00 PM To: Andrey Ptashnik <APtashnik@xxxxxxxxx> Cc: "ceph-users@xxxxxxxxxxxxxx" <ceph-users@xxxxxxxxxxxxxx> Subject: Re: [ceph-users] Adjust PG PGP placement groups on the fly 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
<APtashnik@xxxxxxxxx> wrote:
Hello Ceph team, |
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