Please refer to standard documentation as much as possible,
http://docs.ceph.com/docs/jewel/rados/operations/placement-groups/#set-the-number-of-placement-groups
<http://docs.ceph.com/docs/jewel/rados/operations/placement-groups/#set-the-number-of-placement-groups>
Han’s is also incomplete, since you also need to change the ‘pgp_num’ as well.
Regards,
Hans
> On Jan 2, 2018, at 4:41 PM, Vladimir Prokofev <[email protected]> wrote:
>
> Increased number of PGs in multiple pools in a production cluster on 12.2.2
> recently - zero issues.
> CEPH claims that increasing pg_num and pgp_num are safe operations, which are
> essential for it's ability to scale, and this sounds pretty reasonable to me.
> [1]
>
>
> [1]
> https://www.sebastien-han.fr/blog/2013/03/12/ceph-change-pg-number-on-the-fly/
>
> <https://www.sebastien-han.fr/blog/2013/03/12/ceph-change-pg-number-on-the-fly/>
>
> 2018-01-02 18:21 GMT+03:00 Karun Josy <[email protected]
> <mailto:[email protected]>>:
> Hi,
>
> Initial PG count was not properly planned while setting up the cluster, so
> now there are only less than 50 PGs per OSDs.
>
> What are the best practises to increase PG number of a pool ?
> We have replicated pools as well as EC pools.
>
> Or is it better to create a new pool with higher PG numbers?
>
>
> Karun
>
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