Is there is a possibility that there was a quota involved? I've seen moves between quota zones to cause a copy then delete.
-- Adam On Thu, Mar 26, 2020 at 9:14 AM Gregory Farnum <gfar...@redhat.com> wrote: > > On Thu, Mar 26, 2020 at 5:49 AM Frank Schilder <fr...@dtu.dk> wrote: > > > > Some time ago I made a surprising observation. I reorganised a directory > > structure and needed to move a folder one level up with a command like > > > > mv A/B/ B > > > > B contained something like 9TB in very large files. To my surprise, this > > command didn't return for a couple of minutes and I started to look what > > was going on. What I discovered was, that the mv command actually performed > > a full copy with a subsequent remove. I had to wait for several hours for > > the move to complete. > > > > I tried to reproduce this today to collect further information. However, > > this behaviour seems not reproducible. No matter what I try, mv completes > > almost instantly. > > > > I was running the original mv on mimic 13.2.2 and retried now with mimic > > 13.2.8. In addition, there was an OS upgrade from Centos 7.6 to 7.7. I'm > > using the kernel-ml versions (5.xxx). Only one cephfs mount was present at > > all times. > > > > My questions are: > > > > 1) Was there a change from 13.2.2 to 13.2.8 explaining this? > > No. > > > 2) Are there (rare) conditions under which an mv on cephfs becomes a cp+rm? > > Not as part of CephFS. > > > 3) Am I seeing ghosts? > > The only way I can imagine this happening is if you had separate > CephFS mounts for cephfs/A/B and cephfs/ and you did the move between > them, instead of within the cephfs/ mount. :/ > -Greg > > > > > Thanks for clues and best regards, > > > > ================= > > Frank Schilder > > AIT Risø Campus > > Bygning 109, rum S14 > > _______________________________________________ > > ceph-users mailing list -- ceph-users@ceph.io > > To unsubscribe send an email to ceph-users-le...@ceph.io > > > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-le...@ceph.io
