Skip site navigation (1)Skip section navigation (2)
Date:      Fri, 21 Dec 2001 11:48:29 +0100
From:      Wilko Bulte <wkb@freebie.xs4all.nl>
To:        Chris Wilmes <cwilmes@creighton.edu>
Cc:        damien@carroll.com, freebsd-questions@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG
Subject:   Re: Sharing a SCSI bus with 2 controllers
Message-ID:  <20011221114829.E23547@freebie.xs4all.nl>
In-Reply-To: <Pine.HPX.4.05.10112201708290.29607-100000@bluejay.creighton.edu>; from cwilmes@creighton.edu on Thu, Dec 20, 2001 at 05:24:52PM -0600
References:  <55670000.1008866988@50.dhcp.hck.carroll.com> <Pine.HPX.4.05.10112201708290.29607-100000@bluejay.creighton.edu>

next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Dec 20, 2001 at 05:24:52PM -0600, Chris Wilmes wrote:
> On Thu, 20 Dec 2001 damien@carroll.com wrote:
> 
> > Is it possible to share a SCSI device with two different controllers? I
> > have a tape backup that I want to share with two systems, and I want them
> > to be both connected at the same time. I have connected both controllers to
> > the tape backup, made sure that they were configured as different device
> > numbers, and re-booted both systems. One is a Windows Machine, the other is
> > a BSD box. Both of the controllers are the same (Adaptec 29160N) The BSD
> > box is complaining about seeing SCSI bus resets on the bus:
> > 
> >   ahc0: Someone reset channel A
> > 
> > What is the correct way to do this (if it is at all possible)? Are there
> > special kernel or hardware settings required for this to work properly?
> > 
> 
> 
> Congratulations on discovering one of the cooler features of SCSI.
> 
> The SCSI bus resets are probably harmless, but the error messages can come
> at inopportune times.  You can stop most of the bus resets by changing a

					^--- exactly ;-)

It will still not stop the driver from issuing bus resets.

Tapes on shared SCSI buses are eh, em, interesting. Imagine a bus reset
from system 1 while system 2 is writing a backup. Tape rewinds, system
2 recovers and continues writing. etc.

W/

-- 
|   / o / /_  _   		email: 	wilko@FreeBSD.org
|/|/ / / /(  (_)  Bulte		Arnhem, The Netherlands	

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message




Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20011221114829.E23547>