Never. I would only consider increasing it if you were increasing your target max bytes or target full ratio.
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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