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
