Am 25.05.2018 um 14:57 schrieb Ric Wheeler: > Is this move between directories on the same file system? It is, we only have a single CephFS in use. There's also only a single ceph-fuse client running. What's different, though, are different ACLs set for source and target directory, and owner / group, but I hope that should not matter. All the best, Oliver > Rename as a system call only works within a file system. > > The user space mv command becomes a copy when not the same file system. > > Regards, > > Ric > > > On Fri, May 25, 2018, 8:51 AM John Spray <jspray@xxxxxxxxxx <mailto:jspray@xxxxxxxxxx>> wrote: > > On Fri, May 25, 2018 at 1:10 PM, Oliver Freyermuth > <freyermuth@xxxxxxxxxxxxxxxxxx <mailto:freyermuth@xxxxxxxxxxxxxxxxxx>> 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? > > 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@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx <mailto:ceph-users@xxxxxxxxxxxxxx> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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