Hello, On Thu, 28 Aug 2014 19:49:59 -0400 J David wrote: > On Thu, Aug 28, 2014 at 7:00 PM, Robert LeBlanc <robert at leblancnet.us> > wrote: > > How many PGs do you have in your pool? This should be about 100/OSD. > > There are 1328 PG's in the pool, so about 110 per OSD. > And just to be pedantic, the PGP_NUM is the same? The formula is actually OSDs * 100 / replication, so in your case 12*100/2=600. Now with small clusters is is better to err on the large side, see the next paragraph. Now 1328 (just out of curiosity, how did you arrive at that number?) isn't a power of 2 and the happy documentation says: --- The result should be rounded up to the nearest power of two. Rounding up is optional, but recommended if you want to ensure that all placement groups are roughly the same size. --- Since you can't go down, the only way is up. To 2048 See it as an early preparation step towards the time when you reach 48 OSDs. ^o^ Increasing PG (and PGP) will cause data movement of course, so do this in an off-peak time and start with a small increment (firefly won't even let you add more than 256 PGs at a time). This should give you a much smoother distribution. Regards, Christian > Thanks! > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Christian Balzer Network/Systems Engineer chibi at gol.com Global OnLine Japan/Fusion Communications http://www.gol.com/
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