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Date:      Sun, 17 Aug 1997 00:30:14 -0500 (CDT)
From:      "Daniel M. Eischen" <deischen@iworks.InterWorks.org>
To:        freebsd-scsi@FreeBSD.ORG, grog@lemis.com
Subject:   Re: Bus resets.  Grrrr.
Message-ID:  <199708170530.AAA17585@iworks.InterWorks.org>

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> This is the third time in a row that I haven't been able to complete a backup
> because of "recoverable" SCSI errors.  Here's a pretty typical scenario:
>
> IGI == 0x0
>
> What does this mean?  What can time out when nothing's happening?  Or is this a
> timeout accepting a new command when it shouldn't have to?  Is this a device or
> a driver logic error?

I think you're missing a few character.  It should probably read SCSISIGI = 0x0,
which means the SCSI Control Signal Register was thinks it's in a Data Out
phase.

[...]

> but the tape dies.  Is there a good reason for this?  I would have thought that
> it would make sense for a power on or reset, but not for a bus reset.  Does a
> tape unit lose its position or data when it receives a bus reset?

I get this also when doing backups on my HP C1533 with tapes
that are older/bad.  The drive seems to retension itself, or
something similar, during the middle of accessing it.  Using a
newer tape doesn't exhibit the same problem.

Usually, my system will lock up when this happens.  This is under
3.0-current, though I haven't tried since Justin committed the
spin-lock fix to the sequencer.

Dan Eischen
deischen@iworks.InterWorks.org



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