> 28 марта 2014 г., в 17:10, Chad Seys <cwseys@xxxxxxxxxxxxxxxx> написал(а): > > 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. Backfilling process can be stopped/paused at some point due to config settings or other reasons, so ceph reflects current state of PGs that are in fact degraded because replica is missing on fresh OSD. Those PGs actually being backfilled display 'degraded+backfilling' state. > > 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 _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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