>     Let's remember...
>     for a single controller the 3590(s) total thru put rating goes like...

Good point, Dwight.  And "it all depends..."  If your concurrent usage of
the drives is intense, you need to limit the number on a single I/O chain
according to conduit capacity.  Client backups which go directly to tape
often involve a lot of skipping of ineligible files and so no I/O at those
times, which improves your ability to perform a number of concurrent backups,
because they are less likely to be concurrently writing at the same time.  All
the variables in configuration work make administration lots of fun.  :-)
   Richard Sims, BU