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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!lucy.swin.edu.au!news.rmit.EDU.AU!news.unimelb.EDU.AU!munnari.OZ.AU!news.ecn.uoknor.edu!news.wildstar.net!news.ececs.uc.edu!cloudbreak.rs.itd.umich.edu!newsxfer3.itd.umich.edu!news.bbnplanet.com!su-news-hub1.bbnplanet.com!arclight.uoregon.edu!news.uoregon.edu!news.emf.net!dremu From: dremu@emf.net (The Mu-Meister) Newsgroups: comp.periphs.scsi,comp.unix.bsd.freebsd.misc Subject: Re: Bizarre SCSI problem (3 disks work, 4 don't) (2940UW/Quantum Atlas II) Followup-To: comp.periphs.scsi,comp.unix.bsd.freebsd.misc Date: 4 Feb 1997 15:33:38 GMT Organization: "emf.net" Quality Internet Access. (510) 704-3800 (login: guest) Lines: 35 Message-ID: <5d7ksi$9ff@emf.emf.net> References: <5d7201$qa@gosset.maths.tcd.ie> NNTP-Posting-Host: 205.149.0.20 X-Newsreader: TIN [version 1.2 PL2] Xref: euryale.cc.adfa.oz.au comp.periphs.scsi:69727 comp.unix.bsd.freebsd.misc:35058 Alan Judge (ajudge@maths.tcd.ie) spoke thusly: : 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 : activity lights will remain on. Eventually FreeBSD times out and : things unlock and an error is generated. This problem can occur as : early as the initial probing of the disks. I betcha you disabled the termination on the drive via a jumper. What you may well need to do - I had to on a chain of CDC drives once I won't describe due to embarassment now - is remove the resistor packs as well. (This assumes your drives have them!) If they're present, even though the +5V side isn't connected (ie the unit isn't terminated) the ground side is still connected and it hoses the SCSI bus. Just a thought. -- home: dremu@emf.net http://www.emf.net/~dremu that's doctor emu ftp.emf.net/users/dremu work: aaron_shephard@peoplesoft.com http://www.peoplesoft.com My other computer is a Linux box and of course, the views expressed herein are those solely of the indivudal and in no way alleged to indicate those of PeopleSoft or other PeoplePeople