On Mon, Mar 21, 2016 at 7:44 AM, Dzianis Kahanovich <maha...@bspu.unibel.by> wrote: > I have (second time) stuck mds warning: "Behind on trimming (63/30)". Looks > working. What it mean and how to avoid it? And how to fix (exclude > stop/migrate > active mds)?
The MDS has a metadata journal, whose length is measured in "segments", and it is trimmed when the number of segments gets greater than a certain limit. The warning is telling you that the journal is meant to be trimmed after 30 segments, but you currently have 63 segments. This can happen when something (including a client) is failing to properly clean up after itself, and leaving extra references to something in one of the older segments. In fact, a bug in the kernel client was the original motivation for adding this warning message. John > Looks happened both time at night - probably on long backup/write operations > (something like compressed local root backup to cephfs). Also all local mounts > inside cluster (fuse) moved to automout to reduce clients pressure. Still 5 > permanent kernel clients. > > Now I remount all but 1 kernel clients. Message persist. There's probably a reason you haven't already done this, but the next logical debug step would be to try unmounting that last kernel client (and mention what version it is) John _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
