Are both towers full??
On the SSA adapter in the J50 the connectors are labelled A0, A1, B0 and B1. Connect A0 to '1' on the first tower and A1 to '8' or '16' on the same tower. (Can't remmber if it has one or two eight disk drawers).
Connect B0 and B1 in the same way to the other tower.
Cheers
Henrik Morsing
Certified AIX 4.3 Systems Administration
& p690 Technical Support