From owner-freebsd-stable Tue Jun 5 18:41:42 2001 Delivered-To: freebsd-stable@freebsd.org Received: from mail.webmonster.de (datasink.webmonster.de [194.162.162.209]) by hub.freebsd.org (Postfix) with SMTP id 2B7B637B405 for ; Tue, 5 Jun 2001 18:41:36 -0700 (PDT) (envelope-from karsten@rohrbach.de) Received: (qmail 99744 invoked by uid 1000); 6 Jun 2001 01:41:57 -0000 Date: Wed, 6 Jun 2001 03:41:57 +0200 From: "Karsten W. Rohrbach" To: Thomas Seck Cc: freebsd-stable@freebsd.org Subject: Re: Strange SCSI error message Message-ID: <20010606034157.B97958@mail.webmonster.de> References: <20010605123023.S4259-100000@merlin.th.physik.uni-bonn.de> <20010605125635.A1349@basildon> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-md5; protocol="application/pgp-signature"; boundary="3uo+9/B/ebqu+fSQ" Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010605125635.A1349@basildon>; from tmseck@web.de on Tue, Jun 05, 2001 at 12:56:35PM +0200 X-Arbitrary-Number-Of-The-Day: 42 X-URL: http://www.webmonster.de/ X-Disclaimer: My opinions do not necessarily represent those of my employer Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG --3uo+9/B/ebqu+fSQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Thomas Seck(tmseck@web.de)@2001.06.05 12:56:35 +0000: > On Jun 05 2001, Jan Conrad wrote: > > Hi, > >=20 > > I just got the following error message (running 4.3R) > >=20 >=20 > (snipped) >=20 > I have kern/26880 open on a similar issue. It's an Adaptec 19160 with=20 > Quantum Atlas V disks attached. After we fiddled with the SCSI cables=20 > I have not seen the error for about five weeks now. Maybe you might want= to=20 > look over the cabling/adaptor termination, too? It seems the driver is a= =20 > bit picky about that?! i guess you both ran into the quite well known bad termination problem. there were some questions a while ago concerning the freebsd vs linux scenario where a freebsd fails with SCB timeouts while a linux runs along with apparently no problems at all. the quick answer for this particular behaviour in freebsd is, that the io subsystem is designed to put more load onto the scsi devices than the implementation of other os'es io subsystems. so, basically, what happens is, that you only see the timeouts under freebsd, of course, since it arbits the scsi bus more often, and with more data in the same period of time compared to other implementations. terminate correctly, symmetric terminators, active, for u160. use good cables, no vobis crap ;-) i use amphenol cables for external links and gr-kabel (german distributor) for internal wiring. this solved most of my scsi problems with u160. >=20 > Regards from Bornheim :-) > Thomas Seck cheers from darmstadt, /k --=20 > It's not that perl programmers are idiots, it's that the language rewards > idiotic behavior in a way that no other language or tool has ever done.= =20 > --Erik Naggum=20 KR433/KR11-RIPE -- WebMonster Community Founder -- nGENn GmbH Senior Techie http://www.webmonster.de/ -- ftp://ftp.webmonster.de/ -- http://www.ngenn.n= et/ karsten&rohrbach.de -- alpha&ngenn.net -- alpha&scene.org -- catch@spam.de GnuPG 0x2964BF46 2001-03-15 42F9 9FFF 50D4 2F38 DBEE DF22 3340 4F4E 2964 B= F46 --3uo+9/B/ebqu+fSQ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE7HYplM0BPTilkv0YRArobAJ965uBQT10S1tG28/tEJAUx2bA7iwCfUssC mPPo1DzwQtaVV4mG5McMMI4= =2Hlh -----END PGP SIGNATURE----- --3uo+9/B/ebqu+fSQ-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message