Ah, so I've been doing it wrong all this time (I thought we had to take the size multiple into account ourselves).
Thanks! On Wed, Jan 7, 2015 at 4:25 PM, Michael J. Kidd <michael.k...@inktank.com> wrote: > Hello Christopher, > Keep in mind that the PGs per OSD (and per pool) calculations take into > account the replica count ( pool size= parameter ). So, for example.. if > you're using a default of 3 replicas.. 16 * 3 = 48 PGs which allows for at > least one PG per OSD on that pool. Even with a size=2, 32 PGs total still > gives very close to 1 PG per OSD. Being that it's such a low utilization > pool, this is still sufficient. > > Thanks, > Michael J. Kidd > Sr. Storage Consultant > Inktank Professional Services > - by Red Hat > > On Wed, Jan 7, 2015 at 3:17 PM, Christopher O'Connell <c...@sendfaster.com> > wrote: > >> Hi, >> >> I"m playing with this with a modest sized ceph cluster (36x6TB disks). >> Based on this it says that small pools (such as .users) would have just 16 >> PGs. Is this correct? I've historically always made even these small pools >> have at least as many PGs as the next power of 2 over my number of OSDs (64 >> in this case). >> >> All the best, >> >> ~ Christopher >> >> On Wed, Jan 7, 2015 at 3:08 PM, Michael J. Kidd <michael.k...@inktank.com >> > wrote: >> >>> Hello all, >>> Just a quick heads up that we now have a PG calculator to help >>> determine the proper PG per pool numbers to achieve a target PG per OSD >>> ratio. >>> >>> http://ceph.com/pgcalc >>> >>> Please check it out! Happy to answer any questions, and always welcome >>> any feedback on the tool / verbiage, etc... >>> >>> As an aside, we're also working to update the documentation to reflect >>> the best practices. See Ceph.com tracker for this at: >>> http://tracker.ceph.com/issues/9867 >>> >>> Thanks! >>> Michael J. Kidd >>> Sr. Storage Consultant >>> Inktank Professional Services >>> - by Red Hat >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@lists.ceph.com >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >>> >> >
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