Never. I would only consider increasing it if you were increasing your target max bytes or target full ratio.
On Sun, May 28, 2017, 11:14 PM Konstantin Shalygin <k0...@k0ste.ru> wrote: > > On 05/29/2017 10:08 AM, David Turner wrote: > > If you aren't increasing your target max bytes and target full ratio, I > wouldn't bother increasing your pgs on the cache pool. It will not gain > any increased size at all as its size is dictated by those settings and not > the total size of the cluster. It will remain as redundant as always. > > If you are set on increasing it, which I don't see a need for, then I > would recommend removing it as a cache pool, increase the PG count, and > then add it back in. You will need to stop all clients that are accessing > the EC rbd pool during this process. > > Thanks for consult. > > On what number of OSDs I should think about increasing of PG count on > ec_cache pool? >
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