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.
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