From owner-freebsd-stable Wed Feb 28 4:49:59 2001 Delivered-To: freebsd-stable@freebsd.org Received: from shalimar.net.au (shalimar.net.au [198.142.161.98]) by hub.freebsd.org (Postfix) with ESMTP id 24D2A37B719 for ; Wed, 28 Feb 2001 04:49:54 -0800 (PST) (envelope-from count@shalimar.net.au) Received: from shalimar.net.au (localhost [127.0.0.1]) by shalimar.net.au (8.11.2/8.11.1) with SMTP id f1SCnYq00580; Wed, 28 Feb 2001 23:49:34 +1100 (EST) (envelope-from count@shalimar.net.au) From: Zero Sum Organization: Tobacco Chewers and Body Painters Association. Date: Wed, 28 Feb 2001 23:49:33 +1100 X-Mailer: KMail [version 1.1.99] Content-Type: text/plain; charset="us-ascii" To: Niek Bergboer , freebsd-stable@FreeBSD.ORG References: <20010228131040.E71226@kaidaw.student.utwente.nl> In-Reply-To: <20010228131040.E71226@kaidaw.student.utwente.nl> Subject: Re: Adaptec AHC / Tape drive problems on 4.2-STABLE X-originating-IP: coolmail.com MIME-Version: 1.0 Message-Id: <01022823493300.00535@shalimar.net.au> Content-Transfer-Encoding: 8bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Wednesday 28 February 2001 23:10, Niek Bergboer wrote: >Hi all, > >Currently I'm having lots of trouble with the department's HP DLT-40 tapestreamer. The fileserver to >which it is attached was formerly running FreeBSD 3.5-STABLE (from around november 2000), and the tapest >reamer functioned without >any problems. Two weeks ago I upgraded to FreeBSD 4.2-STABLE (i.e. I didn't perform a direct upgrade, >but installed 4.2 on the first HDU leaving the second (data) HDU untouched). The only thing that >basically changed is the operating system: all cables and cards in the system were untouched. > >Since then the tapestreamer won't function. While booting, it complains about SCSI-timeouts (see >attached dmesg excerpt). When issuing mt-commands, the server produces either a nice kernel panic and re >boots, or times out after a while. >The machine runs the FreeBSD 4.2-STABLE from Feb 19 (compiled at Feb 20), but similar problems existed w >ith an earlier STABLE (about Feb 15). The SCSI-card is a Adaptec 2940A Ultra, >and the tapestreamer is the only device attached to it (the disks are ATA due to budget constraints). Nick, 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. Disclaimer: Speculation based on a single observation stretched to fit the facts. Zero Sum -- count@shalimar.net.au Vescere bracis meis http://www.hack.gr/jargon/html/D/disclaimer.html To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message