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Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.oz.au!sgiblab!sdd.hp.com!caen!zip.eecs.umich.edu!yeshua.marcam.com!MathWorks.Com!news2.near.net!noc.near.net!shore.shore.net!rwwa.com!witr From: witr@rwwa.com (Robert Withrow) Newsgroups: comp.os.386bsd.questions Subject: Disapearing Disks? Date: 31 Aug 1994 12:52:57 GMT Organization: North Shore Access, a service of Eco Software, Inc. Lines: 27 Distribution: world Message-ID: <341uf9$d4@shore.shore.net> Reply-To: witr@rwwa.com NNTP-Posting-Host: rwwa.com FreeBSD 1.1.5.1, AHA1542, three Maxtor LXT312S drives, one Sony CDU541, one Viper 2150S tape. Recently I have been experencing a situation where, after the system has been running for a while one or more if the disks will cease to be available and I get a ``Unit Attention'' on them, and they become de-configured. Note: by ``running for a while'' I mean running for a while after being re-booted. The system is *never* turned off for more than a few seconds, so the problem doesn't seem to be heat related. I have blown out the dust every now and then. I have carefully configured the scsi bus so that <5 targets are supplying terminator power. The cable is custom, since no one makes a scsi cable with 5 connectors. At first I thought this might be a cable problem, but I can generaly resurect the drives by simply power-cycling the system. Also, I sometimes see the tape drive ``select light'' flashing on and off randomly. Why? The problem always seems to happen in the depths of the night... Finally, this seems to be a recent problem, since the system has been running 1.1.5.1 since it came out and the disks didn't disapear until last week. -- Robert Withrow, Tel: +1 617 598 4480, Fax: +1 617 598 4430 R.W. Withrow Associates, 319 Lynnway, Lynn MA 01901 USA, Net: witr@rwwa.COM