If you never delete your volhist, you can search it to track the number of
times the volume has been assigned to a storagepool.  This won't track
usage as a TSM DBBackup, but if you're willing to be close but not exact,
you can use it.

If you want to track mounts, you need something external.  A good perl
programmer and a reusedelay of 1 day on all storage pools can get this
information.

Nick Cassimatis
nickpc AT us.ibm DOT com

He who laughs last has a good backup.