Am 25.05.2018 um 14:50 schrieb John Spray: > On Fri, May 25, 2018 at 1:10 PM, Oliver Freyermuth > <freyerm...@physik.uni-bonn.de> wrote: >> Dear Cephalopodians, >> >> I was wondering why a simple "mv" is taking extraordinarily long on CephFS >> and must note that, >> at least with the fuse-client (12.2.5) and when moving a file from one >> directory to another, >> the file appears to be copied first (byte by byte, traffic going through the >> client?) before the initial file is deleted. >> >> Is this true, or am I missing something? > > A mv should not involve copying a file through the client -- it's > implemented in the MDS as a rename from one location to another. > What's the observation that's making it seem like the data is going > through the client?
The fact that it's happening with only about 1 GBit/s and all OSDs are reading and writing. I will also check the network interface of the client next time it occurs. Also, ceph-fuse was taking 50 % CPU load just from this. Also, I observe the file at the source being kept during the copy, and the file at the target growing slowly. So it's definitely a copy, and only at the end the source file is deleted. > > John > >> >> For large files, this might be rather time consuming, >> and we should certainly advise all our users to not move files around >> needlessly if this is the case. >> >> Cheers, >> Oliver >> >> >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>
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