On Wed, 15 Nov 2000, Gordon Messmer wrote:
> > The hard drive is the 0:5:0 device, but I've also had this happen when
> > 0:6:0 (the CD burner) was being indicated. The Adaptec 19160 is a
> > single-bus controller, but the two devices are on different physical
> > cables
>
> OK, someone call me on this if I'm wrong, but I'm pretty sure you can't do
> that. If you need a narrow scsi ribbon for the CD-R, then get a cheap
> narrow SCSI controller. I've had experience with systems locking up using
> BT-950 controllers and devices on the internal and external interfaces.
> It worked fine when the external interface wasn't connected to anything.
> At least remove the CD-R for a while and see if it still locks up.
>
It depends on the card. Some will let you use 2 of the 3
connectors. (Internal 50, internal 68, external.) You have to make sure
you terminate both cables the same (active, or passive), and if the card
doesn't have auto-termination, you have to turn off termination on the
card. There are some high end cards that will let you use all three
connectors - they have buffers for each bus, so they end up being three
seperate busses electricly.
You are still better off having a seperate card for naarrow SCSI devices.
If you have the room, it is also nice to seperate tape drives from hard
drives. It can be interesting when the tape drive hangs, and doesn't
disconnect - with the hard drive off the same controller, the system hangs
untill the tape drive command times out. (Tape drives are not supposed to
do this, but it sometimes happens.)
Mikkel
--
Do not meddle in the affairs of dragons,
for you are crunchy and taste good with ketchup.
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