On Mon, Dec 29, 2014 at 4:49 PM, Alexandre Oliva <ol...@gnu.org> wrote:
> However, I suspect that temporarily setting min size to a lower number > could be enough for the PGs to recover. If "ceph osd pool <pool> set > min_size 1" doesn't get the PGs going, I suppose restarting at least one > of the OSDs involved in the recovery, so that they PG undergoes peering > again, would get you going again. > It depends on how incomplete your incomplete PGs are. min_size is defined as "Sets the minimum number of replicas required for I/O.". By default, size is 3 and min_size is 2 on recent versions of ceph. If the number of replicas you have drops below min_size, then Ceph will mark the PG as incomplete. As long as you have one copy of the PG, you can recover by lowering the min_size to the number of copies you do have, then restoring the original value after recovery is complete. I did this last week when I deleted the wrong PGs as part of a toofull experiment. If the number of replicas drops to 0, I think you can use ceph pg force_create_pg, but I haven't tested it.
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