On Tue, Feb 26, 2013 at 6:56 PM, Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx> wrote: > Hi list, > > how can i do a short maintanance like a kernel upgrade on an osd host? > Right now ceph starts to backfill immediatly if i say: > ceph osd out 41 > ... > > Without ceph osd out command all clients hang for the time ceph does not > know that the host was rebootet. > > I tried > ceph osd set nodown and ceph osd set noout > but this doesn't result in any difference > Hi Stefan, in my practice nodown will freeze all I/O for sure until OSD will return, killing osd process and setting ``mon osd down out interval'' large enough will do the trick - you`ll get only two small freezes on the peering process at start and at the end. Also it is very strange that your clients hanging for a long time - I have set non-optimal values for purpose and was not able to observe re-peering process longer than a minute. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |