On Wed, 7 Jan 2015 17:07:46 -0800 Craig Lewis wrote: > On Mon, Dec 29, 2014 at 4:49 PM, Alexandre Oliva <oliva@xxxxxxx> 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. > Which of course begs the question of why not having min_size at 1 permanently, so that in the (hopefully rare) case of loosing 2 OSDs at the same time your cluster still keeps working (as it should with a size of 3). Christian -- Christian Balzer Network/Systems Engineer chibi@xxxxxxx Global OnLine Japan/Fusion Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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