What I always wanted to try, but didn't have a system to play with, was to
change the target pool for migrations, each in a different library.  One
day nextpool is TAPE1, the next it's TAPE2 - easy enough to update along
with the migration thresholds.  On a restore, the data would be split
between the two libraries, so more tapes could be mounted for a restore
process.  That, with a high resourceutilization on the client, could give a
benefit.

Again, just an untested theory.

Nick Cassimatis