Re: Expanding ceph cluster by adding more OSDs

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You can add PGs,  the process is called splitting.  I don't think PG merging, the reduction in the number of PGs, is ready yet.

On Oct 8, 2013, at 11:58 PM, Guang <yguang11@xxxxxxxxx> wrote:

> Hi ceph-users,
> Ceph recommends the PGs number of a pool is (100 * OSDs) / Replicas, per my understanding, the number of PGs for a pool should be fixed even we scale out / in the cluster by adding / removing OSDs, does that mean if we double the OSD numbers, the PG number for a pool is not optimal any more and there is no chance to correct it?
> 
> 
> Thanks,
> Guang
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