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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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