The responses I got were off the list, so I asked if I could post them to
the list
- as this is always a great tool for looking things up.
I had been told by my network engineers that SCSII was SCSII and it would
work
to the lowest common denominator, however the differential was another breed
altogether and they did not think it would work in the same enclosure due to
the
electrical issues as mentioned below.
I will once again try to configure these tonight knowing a bit more of what
to expect.
When I tried before I could not get VOLUTIL to work on this not even with
FORMAT VOL.
The only thing I could come up with as to why they wouldn't work is that
they show
as ST34572WC in MAPPER and were not truly SE - Narrow but rather SE - Wide.
I thought or was hoping that they needed something else such as firmware or
dip
switch settings or "act of god" to work with that Narrow Channel card. So
as much
as these are marked SE and MAPPER can see them, I will once again try after
backups
complete tonight.
You may well find me posting my problem tomorrow if this does not work.
Once again thank you for you help Stan and Gavin,
Cat
============================================
Catherine Litten, (www.littenfamily.com)
Senior Programmer/Analyst
Valley Presbyterian Hospital (www.valleypres.org)
15107 Vanowen Street, Van Nuys, Ca 91405-4597
Phone (818) 782-6600 x 2140 Fax (818) 902-5202
============================================
The thoughts, comments, and opinions expressed herein are mine and do not
reflect those of my employer, or anyone else.
============================================
-----Original Message-----
From: Stan Sieler [mailto:[log in to unmask]]
Sent: Friday, June 29, 2001 2:40 PM
To: Catherine Litten
Subject: Re: [HP3000-L] Narrow vs. Wide Drives
Hi,
> I have a question on what is the physical difference between a SE and DF
> drive is it firmware, toggle switches or something else?
That may mean something to HASS owners, but perhaps not to the
rest of us :)
(I.e., Seagate doesn't refer to drives as "DF", but "SE" probably
means "Single Ended")
> Whenever I have tried to install a drive that is marked SE part number
> A3646A is shows up in MAPPER as ST34572WC or ST34573WC (which are what I
A Seagate ...WC drive is a wide, SCA connector drive. This means that you
could connect (via an adapter plug) to a single-ended
50-pin) SCSI connector (like on the multi-function card of a 9x8)
If you can see it with MAPPER, I'd have expected it to be usable via
VOLUTIL. What does VOLUTIL "say"? Does the drive show up as a configured
disk drive? Is there a message about it at bootup? Can you do
a "FORMATVOL" on it with VOLUTIL (and, if not, what's the error message)?
> this last time). What I really want is what I currently have for my test
> system that DSTAT shows as:
>
> 63-ST34371N MEMBER MEMBER_8 TEST_SET-0
that's a 4.3 GB single-ended SCSI drive.
More on Seagate model number decoding is at:
http://www.seagate.com/support/kb/disc/discmodelinter.html
Stan Sieler [log in to unmask]
www.allegro.com/sieler/wanted/index.html www.allegro.com/sieler
-----Original Message-----
From: Gavin Scott [mailto:[log in to unmask]]
Sent: Friday, June 29, 2001 2:29 PM
To: [log in to unmask]
Subject: RE: [HP3000-L] Narrow vs. Wide Drives
> I have a question on what is the physical difference between a SE and DF
> drive is it firmware, toggle switches or something else?
All MPE (and most HP) FastWide SCSI is High-Voltage Differential as well,
which is electrically incompatible with Single-Ended SCSI.
Some HP FWD (Fasw/Wide/Differential) *drives* are actually SE drives
packaged with a Differential converter board attached, resulting in a drive
which is electrically FWD but which IDs itself as an SE drive.
To the primary difference between SE and FWD is that the voltage levels on
the interface are incompatible.
The High-Voltage Differential interface is incompatible with everything
that's not HVD. Other than that, all SCSI devices from the original SE
drives up through the latest Low-Voltage Differential (LVD) drives are all
compatible to the point that they can all be plugged in at the same time to
any host interface. Of course the lowest-tech device in the chain will
cause all other devices to operate at the same low-tech SCSI version.
So you can plug an old SE drive into a Whizzo Ultra SCSI LVD interface, but
that will effectively turn that interface into an SE one with SE
performance.
Does that help?
Gavin
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