From owner-freebsd-hackers Tue Aug 27 12:15:20 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id MAA21697 for hackers-outgoing; Tue, 27 Aug 1996 12:15:20 -0700 (PDT) Received: from clem.systemsix.com (clem.systemsix.com [198.99.86.131]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id MAA21691 for ; Tue, 27 Aug 1996 12:15:16 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by clem.systemsix.com (8.6.12/8.6.12) with SMTP id NAA28523; Tue, 27 Aug 1996 13:15:12 -0600 Message-Id: <199608271915.NAA28523@clem.systemsix.com> X-Authentication-Warning: clem.systemsix.com: Host localhost didn't use HELO protocol X-Mailer: exmh version 1.6.5 12/11/95 From: Steve Passe To: hackers@freefall.freebsd.org cc: Philippe Regnauld Subject: Re: hackers-digest V1 #1415 In-reply-to: Your message of "Tue, 27 Aug 1996 08:45:51 PDT." <199608271545.IAA10711@freefall.freebsd.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 27 Aug 1996 13:15:12 -0600 Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Hi, > They are :-) Comments and critics welcome. reading this I saw many things that I disagree with, however thinking about them I realized that its not so much a matter of "right way vs. wrong way", but just different outlooks. > mind, not fault tolerance. To start with, try and avoid all forms of > "small tower" designs, as they have a tendency to double as ovens -- my approach is to ALWAYS use mini-towers, but NEVER put your disks in them. the general design of most cabinets is such that you don't get good airflow around the disk area, no matter what you do. put the disks in external cabinets! (not so easy with IDE disks!) > o always terminate both ends of the bus with the right terminator -- > this means SCSI-I (big centronics-type connector) terminators for > SCSI-I busses (also known as passive terminators), and SCSI-II (small > connector) for busses containing SCSI-II devices (active > terminators); you can get SCSI-I terminators in both passive and active versions. this is also true of SCSI-II and SCSI-III. I would discuss the issue of connectors: SCSI-I -> 50 pin centronics SCSI-II -> 50 pin half pitch SCSI-III -> 68 pin half pitch > o internal termination by the drives/devices themselves (i.e.: jumper > activated) should be avoided -- use clip-on terminators that fit on > the ribbon cable like any device; why so, modern drives provide active termination, one less connector to cause problems... -- Steve Passe | powered by smp@csn.net | FreeBSD