Hi Sergey, Thanks much for the explanation! That is reassuring and is very sensible. A wishlist suggestion would be to call this situation something other than "degraded". Maybe merely "backfilling"? Well, I am unfamiliar with all the possible states that already exist and might be appropriate. Thanks again, Chad. On Friday, March 28, 2014 04:49:02 you wrote: > On 28.03.14, 0:38, Chad Seys wrote: > > Hi all, > > > > Beginning with a cluster with only "active+clean" PGS, adding an OSD > > causes > > > > objects to be "degraded". > > > > Does this mean that ceph deletes replicas before copying them to the > > new > > > > OSD? > > No. Ceph adds the new OSD to the acting set of PGs going to be > rebalanced, and number of replicas increase by 1. Replica n+1 is > obviously missing on the new OSD so PG enters 'degraded' state. > Once backfilling process has completed, one of OSDs that previously > served particluar PG is removed from acting set and PG returns to > active+clean state. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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