Is this move between directories on the same file system?
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> wrote:
On Fri, May 25, 2018 at 1:10 PM, Oliver Freyermuth
<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
>
>
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