Just to make sure I got your point correctly:
You mean to check mark the load balance option under destination tab and put Minimum and maximum value. Say 1 as min and 3 as maximum. And concurrency 2..then dp would start the 2 backup parallely even if one drive is available...dp would lock this drive for its usage..once this session is over then next 2 parallel backup would start..
q1: what would happen for those backup jobs for which number of tape drive is configured more than what is available at any point in time in the vtl ? Will they wait ?