Date: Fri, 8 Jan 1999 09:16:53 +0000 (/etc/localtime) From: Jim Thompson <jim.thompson@pobox.com> To: aic7xxx@FreeBSD.ORG Subject: Re: How to force a bus reset? Message-ID: <13973.51331.683182.932626@belboz> In-Reply-To: <19990108091456.N662@osiris.978.org> References: <m3n23u41wj.fsf@dhcp-144.spray.fi> <19990108091456.N662@osiris.978.org>
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>>>>> "Brian" == Brian Ristuccia <brianr@osiris.978.org> writes: Brian> I've been having similar woes with my Archive DAT Brian> changer. When it hits end-of-tape it gets into an error Brian> condition that can only be cleared by removing and Brian> re-inserting the magazine. I have similar problems with my tape drive, a refurbed Exabyte 8200. When it hits EOT, some mt commands cause it to hang. The drive shows no apparent activity, the command never completes, and can't be interrupted. Cycling power to the drive sometimes recovers the situation -- the mt command finishes. At other times, the mt command is still hung after power cycle. The system log shows no SCSI command timeouts, nor bus resets. The commands that are most likely to lock up the driver from EOT are commands that would try to seek past EOT: "mt fsf 1", "mt eod". The rewind commands "mt rewind" and "mt offline" are OK; I haven't tried a bsf command. Frankly, this seems more like an st driver problem than an aic7xxx problem. Any clues? Incidently this tape drive, or one of the linux drivers, was a real nightmare when I was using my Buslogic SCSI card. The drive itself worked fine, but using it appeared to cause kernel memory corruption. I got warnings from the paging system complaining about attempts to load nonexistent pages, errors reported by the VFS system, corrupt ext2 partitions, kernel panics, system hangs, and system resets. Turning off disconnect for the drive appeared to fix (or mask) the problem, but of course also made the system unusably slow when the drive was in use. Since going to the aic7xxx driver I haven't had any problem except the relatively painless drive hangs mentioned above. Thanks, Doug, for making my drive usable. Jim -- _ | _| ~- Jim Thompson | Attaboy, Clarence! \, _} jim.thompson@pobox.com | \( http://pobox.com/~kzinti | To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe aic7xxx" in the body of the message
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