From owner-freebsd-hackers Tue Feb 24 21:47:11 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id VAA08600 for freebsd-hackers-outgoing; Tue, 24 Feb 1998 21:47:11 -0800 (PST) (envelope-from owner-freebsd-hackers@FreeBSD.ORG) Received: from misery.sdf.com (misery.sdf.com [204.244.213.32]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id VAA08502 for ; Tue, 24 Feb 1998 21:47:02 -0800 (PST) (envelope-from tom@sdf.com) Received: from tom by misery.sdf.com with smtp (Exim 1.82 #3) id 0y7ZPL-0003IH-00; Tue, 24 Feb 1998 21:29:27 -0800 Date: Tue, 24 Feb 1998 21:29:27 -0800 (PST) From: Tom To: "Ben Kirkpatrick, ELI" cc: hackers@FreeBSD.ORG Subject: Re: SCSI Bus redundancy... In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Tue, 24 Feb 1998, Ben Kirkpatrick, ELI wrote: > I've been wondering about the scsi redundancy problems that come up now > and then (read: I've been chewing on paint chips again). What parts are > failing? In my experience, only disks have failed once installed; > controllers have only failed during poor installations and very rare at > that. > But what I was really wondering, is this about have two SCSI cards on > one scsi bus. On one of my old adaptec's it _looks_ like I can change the SCSI adapter rarely fail. It is possible to have up to two host adapters per channel. Someone the freebsd-scsi list is working on this. Rather than a simple backup design, he is working on simultanous use of both host adapters at the same time, by two separate computers. The two systems communicate to make sure they don't step on each others toes when accessing the disks. The idea is to make a fully fault-tolerant cluster. Tom To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message