On Tue, 3 Jun 1997 11:17:00 -0400, "Davidson, Brian"
<[log in to unmask]> wrote:

>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]
You are wasting your time.

The "seagate" seagate drives don't have the HP firmware on them.  The
system will recognize them at the hardware level (ODE/MAPPER), but MPE
won't recognize them.

Seagate will only sell the "special" drives to HP.

I am sending you a related, private email on an alternative product
that *DOES* work, and will be on the market soon.