From owner-freebsd-scsi Fri Oct 16 04:09:45 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id EAA14689 for freebsd-scsi-outgoing; Fri, 16 Oct 1998 04:09:45 -0700 (PDT) (envelope-from owner-freebsd-scsi@FreeBSD.ORG) Received: from mail.HiWAAY.net (fly.HiWAAY.net [208.147.154.56]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id EAA14672; Fri, 16 Oct 1998 04:09:39 -0700 (PDT) (envelope-from dkelly@n4hhe.ampr.org) Received: from nospam.hiwaay.net (tnt4-28.HiWAAY.net [208.166.127.28]) by mail.HiWAAY.net (8.9.0/8.9.0) with ESMTP id GAA30422; Fri, 16 Oct 1998 06:09:18 -0500 (CDT) Received: from n4hhe.ampr.org (localhost.ampr.org [127.0.0.1]) by nospam.hiwaay.net (8.8.8/8.8.8) with ESMTP id GAA16802; Fri, 16 Oct 1998 06:09:15 -0500 (CDT) (envelope-from dkelly@n4hhe.ampr.org) Message-Id: <199810161109.GAA16802@nospam.hiwaay.net> X-Mailer: exmh version 2.0.2 2/24/98 To: Terry Lambert cc: freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG From: David Kelly Subject: Re: filesystem safety and SCSI disk write caching In-reply-to: Message from Terry Lambert of "Thu, 15 Oct 1998 18:21:55 -0000." <199810151821.LAA15497@usr02.primenet.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 16 Oct 1998 06:09:15 -0500 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org Terry Lambert writes: > > > If that's the reason for the problem that I saw, then the UPS the > > > system was plugged into wasn't sufficient to prevent the problem. > > > > Before you fight it too much more, replace the power supply. I've cured > > a number of "impossible" problems with a new power supply. > > Uh, you won't cure "Don punching the reset button to simulate a > particular set of hardware failures" with a new supply. > > 8-). Why not? It might be interesting to put a recording voltmeter such as a digital storage oscilloscope on the HD power leads when Don is punching the reset. No telling what kind of voltage surges are generated when the load on the power supply is altered. No telling *if* there are changes in the PS load when reset is punched either. Think my PPro-166 CPU pulls 10A. If it suddenly stops pulling that much current when RESET is active then what does the PS do? -- David Kelly N4HHE, dkelly@nospam.hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message