In a message dated 6/23/98 3:09:33 PM GMT,  [log in to unmask] writes:

<< I have 4 HP6000 mass storage systems installed in my 987sx.  Each system
has 2 3.5' half height 2 gig. Drives installed. The mass storage systems are
paired off onto two separate single ended SCSI controllers.  Each controller
has 4 devices presently connected to it.  I would like to max. out each system
by adding 3 more 2 gig drives to each 6000 system.  That would make a total of
10 devices per single ended controller.  My problem is that I do not have any
additional slots available to add more controllers and fast wides are not an
option.  So my question is, how many devices are supported on a Single Ended
SCSI controller and how do I set the SCSI address switches??

 Any help would be appreciated

 Jack Calandra
 AIG New York >>

We have two simliar storage systems on our 980/200 system, each containing 3
2gb drives, making a total of 6 drives on one single ended SCSI controller,
with a cable length totalling 4.5 meters, running without any problems.

I believe the maximum number of devices are 16, but dont hold me to
that......an  engineer told me some months ago, although he recomended no more
than 8. But I think you would run into a problem well before you hit 10. You
are limited to a 6 metre cable length from the SCSI card to the end
terminator, this includes any internal wiring in each drive. We over-reached
the 6 meters by 1.5 meters (7.5 in total) and experienced problems in
reading/writing to the discs, as soon as we reduced this, to 4.5 meters in
total the problem disappeared.

As to the configuring the SCSI address switches, I am unsure.

I hope this information is helpful to yourself.

Andrew Popay
ARC Central
E-mail:[log in to unmask]
Any opinions or comments listed are mine and not those of my employer or
anyone else.