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From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com>
Message-Id: <199507172153.OAA02168@gndrsh.aac.dev.com>
Subject: Re: scsi problems
To: paul@FreeBSD.org
Date: Mon, 17 Jul 1995 14:53:57 -0700 (PDT)
Cc: dufault@hda.com, FreeBSD-current@FreeBSD.org
In-Reply-To: <199507171730.SAA01309@server.netcraft.co.uk> from "Paul Richards" at Jul 17, 95 06:30:03 pm
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> 
> In reply to Peter Dufault who said
> > 
> > > Now the real problem:
> > > 
> > > I can't use any tape devices (a HP DAT mainly), if I try to write to
> > > it I get (I don't think it's specific to writes though)
> > > 
> > > sd0(aha0:0:0): timed out
> > > adapter not taking commands.. frozen?!
> > > Debugger("aha1542")
> > 
> > Do you have any problems with tape transfers before this happens?
> 
> It writes to the tape for a while (not long) and then hangs.

Never mind my sync point then, if you can get this far it is not that!

> > This is what happens when the bus jams - the adaptec driver
> > tries to abort the transaction (apparently the disk transaction in
> > this case), and when it times out again it finds that the mailbox still
> > has the ABORT command in it.  At that point it assumes all is lost,
> > and panics.
> > 
> > Is the tape the only external device or anything else unusual?
> 
> Everything is external.

I know you've heard this a hundred times, but, do you have the terminators
installed and enabled on the 1542?  And are your scsi cables double shielded
SCSI-ii rated (meaning there should be about 1/2" in diameter, not 3/8")?

-- 
Rod Grimes                                      rgrimes@gndrsh.aac.dev.com
Accurate Automation Company                 Reliable computers for FreeBSD