For maximum throughput, would we be better off with an Adaptec 39160 (comes
with two 160mb/s external ports) to drive our two Quantum tape drives...

Sould we buy two controllers (say 29160 with single external 160mb/s ports)
to use in our server with PCI-X bus?

At first I would think two controllers would be faster than one, but then I

Would it make a difference? Does a dual port SCSI controller keep up with
two single controllers?

Any thoughts?

Thanks, Graham