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From: dillon@flea.best.net (Matt Dillon)
Newsgroups: comp.periphs.scsi,comp.unix.bsd.freebsd.misc
Subject: Re: Bizarre SCSI problem (3 disks work, 4 don't) (2940UW/Quantum Atlas II)
Date: 4 Feb 1997 13:22:14 -0800
Organization: BEST Internet Communications, Inc.
Lines: 22
Message-ID: <5d89a6$o9h@flea.best.net>
References: <5d7201$qa@gosset.maths.tcd.ie>
NNTP-Posting-Host: flea.best.net
Xref: euryale.cc.adfa.oz.au comp.periphs.scsi:69978 comp.unix.bsd.freebsd.misc:35158
:In article <5d7201$qa@gosset.maths.tcd.ie>,
:Alan Judge <ajudge@maths.tcd.ie> wrote:
:>I have a really odd (in my experience, at least) SCSI problem. The setup is
:>a PC (running FreeBSD 2.2-BETA) containing an Adaptec 2940UW. No internal
:>disks. The external 68-pin connector is connected to a case containing 4
:...
:>
:>The 4 disks are numbers 0..3. When *any* three disks are connected to
:>the ribbon cable, everything works fine; I can access and use the
:...
Make sure that only the last drive on the *physical* chain is
terminated, and that the controller is terminated (assuming
no external drives)... automatic mode on the controller ought
to work.
Try jumpering the drives for staggered-start... the power surge of
them all spinning up simultaniously may be causing a problem, or
your power supply may simply be too weak.
-Matt