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Date:      Sun, 6 Oct 1996 10:33:48 +0200 (MET DST)
From:      Andreas Klemm <andreas@klemm.gtn.com>
To:        Greg Lehey <grog@lemis.de>
Cc:        "Paul T. Root" <proot@horton.iaces.com>, questions@FreeBSD.ORG
Subject:   Re: Problems with Quantum 4gig drive
Message-ID:  <Pine.BSF.3.95.961006102630.12735E-100000@klemm.gtn.com>
In-Reply-To: <199610051058.MAA08760@allegro.lemis.de>

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On Sat, 5 Oct 1996, Greg Lehey wrote:

> Paul T. Root writes:
> >
> > Hi,
> > 	I've got a Compaq DeskPro 2000 (133MHz) machine, with 32 meg,
> > an Adaptec 2940UW, a Seagate ST32550W 2 gig drive on sd0 and
> > a Quantum XP34300W 4gig drive on sd1.
> >
> > My problem is the Quantum won't work. I did install it and things went fine
> > for a couple of hours then. I get parity errors and the SCSI bus hangs up.
> >
> > I did disable the IDE on the motherboard of the Compaq, and without the
> > Quantum drive it works fine. The Quantum is in the middle connector on
> > the internal cable, the Seagate is on the end, there is nothing connected
> > to the external connector.
> >
> > Could it be I need to set a jumper on the quantum? Termination? 
> 
> You shouldn't have terminators on in the middle of the chain.  The
> Seagate should be terminated, and so should the Adaptec (check the
> setup menu).

Try putting the other disk on the chains end and change termination.
I had for example terminaton problems, when putting a CD-ROM at the
end of the SCSI bus ... So perhaps the terminators of your one disk
might not be ok or such ...

Make really sure, that you terminate both ends of the chain and *only*
both ends.

Controller --	has automatic termination feature ... 
		perhaps change settings in the SCSI adapter settings
		from auto termination to simply Enabled !

The disk in the middle of the cable must not be terminated.

The disk at the end of the cable has to be terminated.

Look, there are two things ...
	- scsi termination
	- scsi termination power

SCSI termination power usually comes from the SCSI controller if
I remember right, this jumper doesn't need to be set on the
SCSI disks ... But the one which enables the BUS TERMINATORS !!!

So double check this ... Look especially, where Pin1 is in the
diagrams and on the harddisk !!! ;-) Shit happens ;-))

Ah ... and enable SCSI parity checking ! And perhaps limit the
SCSI transfer rate to 10MByte/sec for the first time and when
things start running raise the speed to 20MByte ...

That's it, good luck !

	Andreas ///

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