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Date:      Sun, 28 Mar 1999 14:04:11 -0800
From:      "Jordan K. Hubbard" <jkh@zippy.cdrom.com>
To:        Doug Rabson <dfr@nlsystems.com>
Cc:        Darren Reed <avalon@coombs.anu.edu.au>, Thomas David Rivers <rivers@dignus.com>, dcs@newsguy.com, hackers@FreeBSD.ORG
Subject:   Re: another ufs panic.. 
Message-ID:  <37231.922658651@zippy.cdrom.com>
In-Reply-To: Your message of "Sun, 28 Mar 1999 17:14:57 %2B0100." <Pine.BSF.4.05.9903281713420.3322-100000@herring.nlsystems.com> 

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> If this is an aha2940 or similar controller, then it doesn't support using
> all three connectors at the same time.  Using both internal connectors at
> the same time as the external one is just asking for trouble.

Let me just echo this claim.  Back when I was somewhat younger and
less experienced in the ways of SCSI, I tried to do this for the
simple reason that it's the obvious thing to try when you have both
wide and narrow peripherals in the box (like a wide drive and narrow
cdrom), an external device like a scanner and absolutely no conception
of how the internal busses are actually wired.  What happens then is
that you create a "Y" in your SCSI chain, with two terminators on one
end, and the fact that it worked for me at all for 5 months until I
got another drive for the wide chain and totally pushed things past
their limits is, frankly, pure amazing luck.

- Jordan


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