2017-03-06 14:08 GMT+01:00 Nick Fisk <nick at fisk.me.uk>: > > I can happily run 12 disks on a 4 core 3.6Ghz Xeon E3. I've never seen > average CPU usage over 15-20%. The only time CPU hits 100% is for the ~10 > seconds when the OSD boots up. Running Jewel BTW. > > So, I would say that during normal usage you should have more than enough > CPU power, not sure why you start getting flapping. Do you have the correct > amount of PG's for the number of OSD's? > Flapping only occurs during recovery, when an entire server (with 24 OSDs) is down for a while and then comes up again. We have 159 PGs per OSD. Maybe this is a regression in Kraken, looks like at least one other user of this list has the same issue: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-February/016483.html Thanks, Andreas
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