[no subject]

You might want to look at (old?) IEEE mass storage conference proceedings.
Tape set scheduling to combine multiple tapes for striping was a 
constant theme.

Are you sure you get full speed out of a single drive right now?
Good buffering can improve speeds considerable.
Sometimes writing a backup image to a staging drive first also helps.

While a HD is faster than a Tape - seeking or complex operations needed for
a backup (checksum of large files) can cause huge changes in data rate.
Normally the backup will wait for the tape - but in between the tape will empty
all data buffers. Then the tape has to stop, wind back a bit, speed up ...
Not good for speed or the tape media.

This looks like something to implement in user space as a multi-threaded 
utility
to me.

It might also a good idea to write a test utility first that consumes data at 
a configurable
rate and sends it to /dev/null and counts the number buffer underruns.
With the test utility you can check the cost/time benefit of different 
solutions.

	Stephan


</pre>
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