Well, let's add up the numbers... (Score 1)

one application which needs arrays of big
drives with big bandwidth is uncompressed
video editing/effects (which, coincidentally,
happens to be the bread and butter of the
company i work for). for example, real-time
uncompressed video requires about 30MB/sec
(or 240Mb/sec).

however, for a simple real-time dissolve
(2 read streams and one write), triple it
to 90MB/sec, and you're beyond what a
single UWSCSI channel will do.

real-time film-res playback
(2Kx1.5Kx48bits colour) is about 340MB/sec.

i'm sure there are other applications, such
as serving many streams of high-quality audio
or video over high-bandwidth net connections
which require striped drive arrays connected
over multiple SCSI channels as well.