From owner-freebsd-questions Thu Dec 20 8:54:54 2001 Delivered-To: freebsd-questions@freebsd.org Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by hub.freebsd.org (Postfix) with ESMTP id 6BDB537B416; Thu, 20 Dec 2001 08:54:49 -0800 (PST) Received: (from dan@localhost) by dan.emsphone.com (8.11.6/8.11.6) id fBKGskX62029; Thu, 20 Dec 2001 10:54:46 -0600 (CST) (envelope-from dan) Date: Thu, 20 Dec 2001 10:54:46 -0600 From: Dan Nelson To: damien@carroll.com Cc: freebsd-questions@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: Sharing a SCSI bus with 2 controllers Message-ID: <20011220165445.GC3747@dan.emsphone.com> References: <55670000.1008866988@50.dhcp.hck.carroll.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <55670000.1008866988@50.dhcp.hck.carroll.com> User-Agent: Mutt/1.3.23.2i X-OS: FreeBSD 5.0-CURRENT X-message-flag: Outlook Error Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG In the last episode (Dec 20), damien@carroll.com said: > 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? You'll see that message when you reboot the windows box. It's not an error. It usually means bad cabling in standard configs, but with a 2-PC setup you'll see it. I've done this without problems. Just make sure you don't make your SCSI bus too long, and make sure you only terminate twice; once at the end of the bus in PC#1, and one at the other end inside PC#2. -- Dan Nelson dnelson@allantgroup.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message