On 07/12/2013 01:45 AM, Stefan Priebe - Profihost AG wrote:
Hello,
is this calculation for the number of PGs correct?
36 OSDs, Replication Factor 3
36 * 100 / 3 => 1200 PGs
But i then read that it should be an exponent of 2 so it should be 2048?
At large numbers of PGs it may not matter very much, but I don't think
it would hurt either!
Basically this has to do with how ceph_stable_mod works. At
non-power-of-two values, the bucket counts aren't even, but that's only
a small part of the story and may ultimately only have a small effect on
the distribution unless the PG count is small.
Stefan
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