From owner-freebsd-hackers Thu Aug 29 01:05:09 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id BAA22901 for hackers-outgoing; Thu, 29 Aug 1996 01:05:09 -0700 (PDT) Received: from ns.eu.org (valerian.glou.eu.org [193.56.58.251]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id BAA22889 for ; Thu, 29 Aug 1996 01:05:01 -0700 (PDT) Received: (from uucp@localhost) by ns.eu.org (8.7.3/8.7.1/951117) with UUCP id KAA00409; Thu, 29 Aug 1996 10:04:53 +0200 (MET DST) Received: (from regnauld@localhost) by tetard.glou.eu.org (8.7.5/8.7.3/tetard-uucp-2.7) id UAA03038; Wed, 28 Aug 1996 20:02:04 +0200 (MET DST) From: Philippe Regnauld Message-Id: <199608281802.UAA03038@tetard.glou.eu.org> Subject: Re: hackers-digest V1 #1415 To: smp@csn.net (Steve Passe) Date: Wed, 28 Aug 1996 20:02:04 +0200 (MET DST) Cc: hackers@freebsd.org (hackers) In-Reply-To: <199608280822.CAA02664@clem.systemsix.com> from Steve Passe at "Aug 28, 96 02:22:42 am" X-Mailer: ELM [version 2.4ME+ PL15 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Steve Passe écrit / writes: > >Because one day you or someone else will plug another case on the end > >of your chain, terminate it, and then spend hours or days trying to work > >out what's wrong with your I*^(*&^(8&^ SCSI subsystem. [...] > Actually I have done this, but it didn't hurt anything, ie terminators > at several points, as well as running without terminators at one end. > On other occasions I have done it and immediately had problems. There > is a wide variation of tolerance among equipment. I have also seen Yes, but that is not the point. The point was that you might not be the only one maintaining the system, and in that case (unless you're a perfect BOFH), you don't randomly plug terminators on the chain :-) Provided you wait long enough, it happens that even you forget you put them there, and while it's "trivial" to see if the terminator is in or not, you *still* have to undo the screws/open the case and look (pure hell if you have a 15 unit controller). Hell, that's like saying, "my machines work fine without proper grounding, I've never had any problems". Hope you have filtered power supplies :-) > setups where it was impossible to run with internal ribbon cable > and external round cables, had to go to ribbon on both ends. An impedance > mismatch, I guess. Had that too... And other weirdnesses with Sun systems. -- Phil -- -[ Philippe Regnauld / regnauld@eu.org / +55.4N +11.3E @ Sol3 / +45 31241690 ]- -[ "To kärve or nøt to kärve, that is the qvestion..." -- My sister ]-