Date: Fri, 9 Mar 2001 14:29:12 +0100 From: Niek Bergboer <niek@wit379119.student.utwente.nl> To: freebsd-stable@freebsd.org Subject: Re: Adaptec AHC / Tape drive problems on 4.2-STABLE Message-ID: <20010309142912.A3189@wit379119.student.utwente.nl> In-Reply-To: <01022823493300.00535@shalimar.net.au>; from count@shalimar.net.au on Wed, Feb 28, 2001 at 11:49:33PM %2B1100 References: <20010228131040.E71226@kaidaw.student.utwente.nl> <01022823493300.00535@shalimar.net.au>
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Hi,
On Wed, Feb 28, 2001 at 11:49:33PM +1100, Zero Sum wrote:
> I don't know if this is going to help, SCSI can be a black art
> sometimes, but I had problems going from 3-5-STABLE to 4.2-STABLE with an
> Adaptec 2940UW (onboard). The most significant thing was that the
> frequency dropped from 20MHz to 10MHz halving transfer speed. I never got
> around to analysing the problem (as other more serious issues arose) but I
> co-incidently replaced the cable with a cable that was actively terminated
> (not by a switch on the last device or by a resistor). When I fitted the
> new cable the problem (and sundry grumblings) vanished. It might be that
> 4.2 is more sensitive to termination conditions, particularly if you are
> manipulating wires to decrease the number of needed pins with the
> "narrow-to-wide convertor plug needed". The 390U2W might be a little more
> intelligent about termination.
Just to get back at the subject: changing the speeds in the SCSI BIOS didn't help, neither did the termination setting in the BIOS. I finally "solved" (i.e.
circumvented) the problem by swapping the SCSI card with a Dawi-control DC 2974
(using BSD's 'amd' driver) which was in another machine driving a scanner
under NT4.
The DC2974 works fine, so my work gets done, but I still don't like the fact
that it didn't work under BSD.
> Disclaimer: Speculation based on a single observation stretched to fit the
> facts.
;) IANAA, I won't sue you.. ;)
> Zero Sum
Niek
--
Conscience doth make cowards of us all.
-- Shakespeare
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