is it more efficient to use tar, rsync or "cp -r"?
(Yes, I know that incremental backups would be faster with rsync.
Also, most all of these files are already compressed, so tar or
rsync -z or -j wouldn't help either.)
With "cp -r" to an ext4 (with extents enabled) fs mounted on an
external USB hard drive, I'm getting a consistent 30MBps, which is
half of USB2.0's theoretical 480Mbps.
Thus, could I tweak a statistically significant more MBps using tar
or rsync? Pre-fetching files or some such? As it stands now, 88%
of my 8GB RAM is "cached".
Or is 30MBps about as good as I can get from the combination of the
USB software and hardware?
--
Scooty Puff, Sr
The Doom-Bringer
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