Re: Jensen 3GB SCSI disk not recognized, causes Kernel panic

Martin Ostermann (ost@comnets.rwth-aachen.de)
31 Jan 1997 16:07:23 +0100

Alvin Starr <alvin@iplink.net> writes:
> On Fri, 31 Jan 1997, Thomas Kuerten wrote:
> > I have a severe problem here with a Jensen (DEC AXP150)
> > with a Adaptec 1740 SCSI controller. my first disk is an
> > IBM 1 GB disk (/dev/sda), and the second one is a QUANTUM
> > FIREBALL 3,2 GB disk (/dev/sdb).
> >
> > whenever I try to access the 3,2 GB disk, I get severe
> > problems.
[..]
> Dec support was unable to help me also. So in short you seem to have only
> 2 options:
> - get a new disk controller
> - use older SCSI drives

I just got an IBM DORS-32150 in SCSI-Ultra-Wide, and it works
flawlessly with the 1742. However, when I plug my external SCSI Box
in, which contains two devices, I get problems on reading the other
disk (some Conner device). Doesn't matter if the box is switched on or
not. Physically removing the external bus helps. I assume this is
because I didn't bother to remove the internal termination of the
1742, which generally works, but is not the correct way [0] With a
total of 6 devices on the bus, I assume correct termination is
mandatory.

So, I recommend to check the termination of the devices[2]. OTOH, it is
known that Quantum screwed the SCSI interface on Fireball disks (the
EIDE versions show faster transfer rates). Maybe there's a problem
especially with the Fireball disk.

Martin

[0] But I am to lazy to do it, and to greedy to by an external high
density terminator ;-) [1]).
[1] The whole setup works great as long as I don't use the second
disk, which only holds some old NT anyhow ... not worth the effort.
[2] Which of cause is the generic advise to all SCSI related problems.

-- 
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