Hi, I have a backup script, which every night : * create a snapshot of each RBD image * then delete all snapshot that have more than 15 days
The problem is that "rbd snap rm XXX" will overload my cluster for hours (6 hours today...). Here I see several problems : #1 "rbd snap rm XXX" is not blocking. The erase is done in background, and I know no way to verify if it was completed. So I add "sleeps" between rm, but I have to estimate the time it will take #2 "rbd (snap) rm" are sometimes very very slow. I don't know if it's because of XFS or not, but all my OSD are at 100% IO usage (reported by iostat) So : * is there a way to reduce priority of "snap rm", to avoid overloading of the cluster ? * is there a way to have a blocking "snap rm" which will wait until it's completed * is there a way to speedup "snap rm" ? Note that I have a too low PG number on my cluster (200 PG for 40 active OSD ; but I'm trying to progressivly migrate data to a newer pool). Can it be the source of the problem ? Thanks, Olivier _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
