Advise is set migration process one lower than available tape units. But not
higher than 4. Their is not a lot of improvement when you set the migration
process higher than 4. We advise to have it always one less because of
priorities within ADSM on backup, restore and migration. Best is to run
migration manual because this is a very CPU intensive process and you don't
want to run this at the same time as the backup.

Regards Tjeerd Saijoen
Certified ADSM Consultant
Tivoli Consultant