Hi,
I am running a Ceph Octopus (15.2.13) cluster mainly for CephFS. Moving
(with mv) a large directory (mail server backup, so a few million small
files) within the cluster takes multiple days, even though both source
and destination share the same (default) file layout and - at least on
the client I am performing the move on - are located within the same
mount point.
I also see that the move is done by recursive copying and later
deletion, as I would only expect between different file systems / mount
points.
Checking with cephfs-shell (16.2.5), the move fails with the "Invalid
cross-device link [Errno 18]" error. However, stat shows the same device
ID for source and destination:
CephFS:~/>>> mv /source/foo /dest/foo
cephfs.OSError: error in rename /source/foo to /dest/foo: Invalid
cross-device link [Errno 18]
CephFS:~/>>> stat /source/foo
Device: 18446744073709551614 Inode: 1099620656366
CephFS:~/>>> stat /dest/
Device: 18446744073709551614 Inode: 1099570814227
Full output at https://pastebin.com/9V6FZ6hP
Any ideas why this happens?
The /source was originally created by ceph fs subvolume create ...,
however I was not using the volume/subvolume features and reorganised
the data - the directory inode is still the same.
Cheers
Sebastian
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