This is a follow-up to my question of does anyone have non-HP FW SCSI
drives on a 3k. What models and how are they configured?  Thanks to
those on the list who have helped.

I paid HP to come and trouble-shoot.  At first they weren't a lot of
help since my drives are not HP drives.  They did it mainly to prove
that their controller card was OK.  However, I checked the FWD
controller card (28696A) and it is differential.  The fact that these
drives are not differential leads me to believe that is why they cannot
be seen on this controller card.  I don't think that configuration or
distant has anything to do with it.  You may want differential drive
when you plan on long SCSI distances.  However, I think that
non-differential drives cannot be seen by the controller card.  HP
brought a FWD drive and it worked fine.  It was recognized instantly by
MAPPER.

What threw me off is the fact that SEAGATE has both ST34371W and
ST34371WD model numbers.  They also have -WC and -DC drive suffixes.
IODFAULT lists the drive without the D.  In the single-ended SCSI world,
I don't think that differential drives comes into play.  In the
Fast-Wide SCSI world on the HP3000 I think differential drives are
required.  I am working with the SEAGATE vendor to trade the ST34371W
drives for ST34371WD drives.  I will see what happens when the new
drives arrive.
> ----------
>From: [log in to unmask]
>To: Davidson, Brian
>Subject: Re: SEAGATE drives on HP3000
>Date: Friday, May 30, 1997 5:40PM
>
>>Yes to the monthly fax.    I'll handle it.        What is a
>differential
>drive?       A differential drive will operate up to 65 feet from the
>host,
>but requires a differential controller also.  A plain single-ended
drive
>must be within 20 feet of the host, counting all cabling inside and
>outside
>of any enclosures.        Is it a
>>ST34371WD model?   Yes, that is the differential model and they work
>wonderfully on the 9000s.        Cabling is all within specs - one 3 m
>cable
>from FW
>>SCSI card to HP6000 disk rack mount.  Drives are within that rack
>>mounting arrangement.
>
>>>Brian Davidson
>>>U.S. Army, Falls Church, VA
>>>Tel:   (703) 681-9781   DSN 761-9781
>>>Fax:   (703) 681-9304   DSN 761-9304
>>>Email: [log in to unmask]