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#1 2008-12-16 11:55:27

323fan
New member
Registered: 2008-12-16
Posts: 4

Slow rsync copying between internal drives - 5 MB/s

I'm seeing very slow copies using rsync to back up between two internal drives.

rsync -avrWh --delete --exclude-from=./exclude.txt /mnt/HD_a2/. /mnt/HD_b2/backup

files are large (audio and video). using -W seemed to speed things up.

After much searching I found a related post with no solution:

http://dns323.kood.org/forum/t2881-Tran … tween.html

Drives are 1.5TB Seagates with updated firmware.  Network copies to and from
the device are fast.

Any help would be appreciated, thanks!

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#2 2008-12-21 21:53:43

323fan
New member
Registered: 2008-12-16
Posts: 4

Re: Slow rsync copying between internal drives - 5 MB/s

rsync appears to be CPU bound and operates at approximately 25% the speed of standard copy.
This really shouldn't be the case but after troubleshooting I've come up with no solutions.

Verified on a friend's 323 with different drives as well.

Folks using the "rsync one drive to the other" script may want to consider cp -au followed
by an rsync to clean up.  If you add or move large files, this will speed things up by a factor of 2-4x.

If anyone has suggestions, please post.

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