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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!ns.saard.net!hakea.adelaide.edu.au!news.cs.su.oz.au!metro!metro!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!news.bbnplanet.com!cpk-news-hub1.bbnplanet.com!newsfeed.internetmci.com!southwind.net!symbios.com!news From: Joe Krantz <joe.krantz@symbios.com> 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: Tue, 04 Feb 1997 10:04:06 -0700 Organization: Symbios Logic Lines: 18 Message-ID: <32F76C06.5A3F@symbios.com> References: <5d7201$qa@gosset.maths.tcd.ie> NNTP-Posting-Host: jkrantzpc.co.symbios.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.02 (WinNT; I) To: Alan Judge <ajudge@maths.tcd.ie> Xref: euryale.cc.adfa.oz.au comp.periphs.scsi:69827 comp.unix.bsd.freebsd.misc:35090 Just a guess... insufficient power... those are big drives, spinning at high RPM Joe Alan Judge 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 > Quantum Atlas II disks. Inside the case, the 4 disks are chained together > on a ribbon cable. The case is terminated with an external active > terminator, and the 2940 termination is set to automatic. > > 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 > disks. When all four are connected, the SCSI system fails quite > quickly. The usual symptoms are a lockup where one of the disk