On 06/19/2012 01:32 AM, Stefan Priebe - Profihost AG wrote:
Am 19.06.2012 06:41, schrieb Alexandre DERUMIER:
Hi Stephann
recommandations are 30-50 PGS by osd if I remember.
rbd, data and metadata have 2176 PGs with 12 OSD. This is 181,333333333
per OSD?!
Stefan
That's probably fine, it just means that you will have a better
pseudo-random distribution of OSD combinations (It does have higher
cpu/memory overhead though). Figuring out how many PGs you should have
per OSD depends on a lot of factors including how many OSDs you have,
how many nodes, CPU, memory, etc. I'm guessing ~180 per OSD won't cause
problems. On the other hand, with low OSD counts you could probably
have fewer and be fine too.
Mark
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