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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!news.unimelb.EDU.AU!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!serv.hinet.net!news.uoregon.edu!hammer.uoregon.edu!news-xfer.netaxs.com!feed1.news.erols.com!wdcpop.dra.net!news.dra.com!netaxs.com!usenet From: Jed Clear <clear@netaxs.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 21:17:47 -0500 Organization: Net Access - Philadelphia's Original ISP Lines: 21 Message-ID: <32F7EDCB.7A5C@netaxs.com> References: <5d7201$qa@gosset.maths.tcd.ie> <5d7nk8$p3h@gosset.maths.tcd.ie> Reply-To: clear@netaxs.com NNTP-Posting-Host: wyndmoor1-25.slip.netaxs.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0Gold (Win95; I) Xref: euryale.cc.adfa.oz.au comp.periphs.scsi:69747 comp.unix.bsd.freebsd.misc:35064 Alan Judge wrote: > > ajudge@maths.tcd.ie (Alan Judge) writes: > >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. > > Some more testing would indicate that things work fine as long as Ultra > SCSI is disabled. Though this setting gives lower performance than 3 > disks at Ultra speed. My guess is that something like cable length is > on the borderline and simply plugging in the extra load is breaking > things. Anyone know for sure? I seem to recall the SCSI spec has a minimum distance between devices. Ultra SCSI is really pushing things so this could be a problem. I think the minimum might be 1 foot, but there seems to be some bit errors on that particular memory. You might check the Adaptec WWW site or their tech support folks. -Jed