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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!newsfeeds.sol.net!uwm.edu!news.nap.net!news2.nap.net!not-for-mail From: Paul Mazza <pmazza@naccess.net> Newsgroups: comp.unix.bsd.bsdi.misc Subject: SCSI channel lock-up woes Date: Mon, 28 Apr 1997 08:56:01 -0400 Organization: North American Communications, Inc. Lines: 48 Message-ID: <33649E61.41C67EA6@naccess.net> NNTP-Posting-Host: sce.naccess.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 3.0 (X11; I; BSD/OS 2.0 i386) Xref: euryale.cc.adfa.oz.au comp.unix.bsd.bsdi.misc:6772 I am experiencing a problem when attempting to back up my BSDI 2.1 box. Here is the configuration: BSDI 2.1 OS with all recent patches running on a: Pentium P166 w/64MB DRAM and an Adaptec AHA-2940 SCSI cntrllr connected to a Seagate Barracuda ST32550N 2GB drive and an HP 4mm DAT Drive (DDS-II). Here is the problem: The system runs beautifully during normal use. When attempting to perform a backup to the DAT drive using the dump utility, the system gets anywhere from 18% to 70% complete and locks up the SCSI bus. The disk activity light (wired into the Adaptec) stays lit, but there is no activity to either the Seagate or the DAT drive. During this lock-up, the CPU and OS are still functioning but have no access to the storage media. A hard reset is necessary at this point. Here is one attempt at a solution: In order to isolate the problem to either the Seagate or the DAT drive, I removed the DAT drive and attached it to another server on the network running BSDI also. I then changed the dump script to look like this: /sbin/dump 0ufB ns2:/dev/nrst0_dds 2000000 / /sbin/dump 0ufB ns2:/dev/nrst0_dds 2000000 /usr rsh ns2 "/bin/mt -f /dev/nrst0_dds rewind" I then began the script and the same thing happened. In other words, the problem was not being caused by the DAT drive. Please note that in both of the situations listed above, the first dump was successful (the root fs). Only during the "usr" dump did the SCSI bus seize up. It is worth noting that the root fs is quite small whereas the "usr" fs is over 1.8 GB. Also, I have checked bus termination and cabling and everything seems in order. Any help would be appreciated. Thank You, -- S. Paul Mazza, III North American Communications, Inc <pmazza@naccess.net> 1-800-326-9559