From owner-freebsd-hackers Thu Sep 5 13:44:25 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id NAA17109 for hackers-outgoing; Thu, 5 Sep 1996 13:44:25 -0700 (PDT) Received: from insanus.matematik.su.se (root@insanus.matematik.su.se [130.237.198.12]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id NAA17103 for ; Thu, 5 Sep 1996 13:44:19 -0700 (PDT) Received: from localhost (tege@sophie.matematik.su.se [130.237.198.29]) by insanus.matematik.su.se (8.7.5/8.6.9) with ESMTP id WAA20334; Thu, 5 Sep 1996 22:43:53 +0200 (MET DST) Message-Id: <199609052043.WAA20334@insanus.matematik.su.se> X-Address: Department of Mathematics, Stockholm University S-106 91 Stockholm SWEDEN X-Phone: int+46 8 162000 X-Fax: int+46 8 6126717 X-Url: http://www.matematik.su.se To: Stefan Esser cc: Sean Eric Fagan , bde@zeta.org.au, hackers@freebsd.org Subject: Re: forwarded In-reply-to: Your message of "Thu, 05 Sep 1996 21:53:32 +0200." <199609051953.VAA01686@x14.mi.uni-koeln.de> Date: Thu, 05 Sep 1996 22:43:52 +0200 From: Torbjorn Granlund Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Hmmm, what's the length of the SCSI cable ? What quality is it ? I don't know if the quality is OK, but it is surely not more than 0.75 metres. I assume you know, that Ultra-SCSI tolerates at most 1.5 (5ft.) of high-quality cable, total. According to the Ultra docs I have, up to 6 metres should be OK. (3 metres if there are any non-ultra devices on the bus.) But if your cable is not exactly up to the requirements of the spec, I'd be careful not to go beyond half that length. I don't. Another (IMHO) open question is, whether FAST SCSI devices (like your DAT and CDROM) may be on a SCSI bus using 20MHz transfer rates. I'd be careful because of a perhaps too high load, and because they might become confused because of the too short strobes. Possible, but the other devices were idle when the disk corruption took place. Torbjorn