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From: Joe Greco <jgreco@brasil.moneng.mei.com>
Message-Id: <199610241622.LAA11876@brasil.moneng.mei.com>
Subject: Re: Apparent SCSI bus hangs...
To: scrappy@ki.net (Marc G. Fournier)
Date: Thu, 24 Oct 1996 11:22:29 -0500 (CDT)
Cc: joerg_wunsch@uriah.heep.sax.de, freebsd-current@FreeBSD.org
In-Reply-To: <Pine.NEB.3.95.961024051332.5862C-100000@quagmire.ki.net> from "Marc G. Fournier" at Oct 24, 96 05:15:36 am
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> On Thu, 24 Oct 1996, J Wunsch wrote:
> 
> > As Marc G. Fournier wrote:
> > 
> > > (aha0:0:0): "SEAGATE ST32151N 0284" type 0 fixed SCSI 2
> > > sd0(aha0:0:0): Direct-Access 2049MB (4197405 512 byte sectors)
> > > 
> > > 	Sitting on an Adaptec 1542CF controller.
> > > 
> > 
> > (ncr0:0:0): "SEAGATE ST32155N 0532" type 0 fixed SCSI 2
> > sd0(ncr0:0:0): Direct-Access 
> > sd0(ncr0:0:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8.
> > 2049MB (4197405 512 byte sectors)
> > 
> > Only a note that this one still works fine.
> >
> 	Okay...let's throw something else in that I only just through 
> about...
> 
> 	Has anyone noticed any problems with having AHC_TAG_ENABLE set
> in the kernel?  That's the only thing I can think of that's changed
> recently, to my configuration.  I'm certain that the problem started
> before I did that, but not 100% certain :(

I did not think that AHC_TAG_ENABLE affected an "aha" controller...  but
I can not honestly say I have looked at the sources.

I am using two dozen 31055N's (the 1G Hawk "Ultra SCSI") on NCR's as well
and am having very, very, very infrequent drive lock ups (one per month
maybe) under 2.1.5R.  The NCR uses 4 tags by default.

I will shortly be building a machine with 2 AHA-3940's and a pile of
31055N's and possibly a 1542CF for the CD-ROM, and if you are still 
having problems, I would be happy to see if I can reproduce them with
a few 31055N's on the 1542CF.

Good luck,

... JG