Thanks Greg. I appreciate the advice, and very quick replies too :)
On 18 July 2014 23:35, Gregory Farnum <g...@inktank.com> wrote: > On Fri, Jul 18, 2014 at 3:29 PM, James Eckersall > <james.eckers...@fasthosts.com> wrote: > > Thanks Greg. > > > > Can I suggest that the documentation makes this much clearer? It might > just be me, but I couldn't glean this from the docs, so I expect I'm not > the only one. > > > > Also, can I clarify how many pg's you would suggest is a decent number > for my setup? > > > > 80 OSD's across 4 nodes. 5 pools. > > I'm averaging 38 PG's per OSD and from the online docs and older posts > on this list, I think I should be aiming for between 50 and 100? > > > > I'm hoping that by only having 38 PG's per OSD, that is the cause of the > uneven distribution and that can be fairly easily rectified. > > That seems likely. The general formula to get a baseline is > (100*OSDs/replication count) when using one pool. It's also generally > better to err on the side of more PGs than fewer; they have a cost but > OSDs can usually scale into the high thousands of PGs, so I personally > prefer people to go a little higher than that. You'll also want to > adjust things so that the pools with more data get more PGs than the > ones with much less, or they won't do you much good. > -Greg > Software Engineer #42 @ http://inktank.com | http://ceph.com >
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