From owner-freebsd-hackers@FreeBSD.ORG Wed Nov 9 21:32:23 2005 Return-Path: X-Original-To: freebsd-hackers@freebsd.org Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id CC29B16A41F; Wed, 9 Nov 2005 21:32:23 +0000 (GMT) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (gate.funkthat.com [69.17.45.168]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6897E43D48; Wed, 9 Nov 2005 21:32:23 +0000 (GMT) (envelope-from jmg@hydrogen.funkthat.com) Received: from hydrogen.funkthat.com (localhost.funkthat.com [127.0.0.1]) by hydrogen.funkthat.com (8.13.3/8.13.3) with ESMTP id jA9LWM8Z008983; Wed, 9 Nov 2005 13:32:22 -0800 (PST) (envelope-from jmg@hydrogen.funkthat.com) Received: (from jmg@localhost) by hydrogen.funkthat.com (8.13.3/8.13.3/Submit) id jA9LWMvx008982; Wed, 9 Nov 2005 13:32:22 -0800 (PST) (envelope-from jmg) Date: Wed, 9 Nov 2005 13:32:22 -0800 From: John-Mark Gurney To: Danny Howard Message-ID: <20051109213221.GA775@funkthat.com> Mail-Followup-To: Danny Howard , freebsd-geom@freebsd.org, freebsd-hackers@freebsd.org References: <20051109212534.GD72876@ratchet.nebcorp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20051109212534.GD72876@ratchet.nebcorp.com> User-Agent: Mutt/1.4.2.1i X-Operating-System: FreeBSD 5.4-RELEASE-p6 i386 X-PGP-Fingerprint: B7 EC EF F8 AE ED A7 31 96 7A 22 B3 D8 56 36 F4 X-Files: The truth is out there X-URL: http://resnet.uoregon.edu/~gurney_j/ X-Resume: http://resnet.uoregon.edu/~gurney_j/resume.html Cc: freebsd-hackers@freebsd.org, freebsd-geom@freebsd.org Subject: Re: GEOM for multipath? How? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: John-Mark Gurney List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 09 Nov 2005 21:32:23 -0000 Danny Howard wrote this message on Wed, Nov 09, 2005 at 13:25 -0800: > And I says to myself "AHA! Multipath should be easy to implement on > FreeBSD as well, via geom." But I can't find an obvious way given > existing geom utils to do this. And like I said, the box I'd use this > on is inaccesible for now. > > Basically, I'd want a provider, that would see two disks, and if it > could talk to one disk, it would, else it would talk to the other. geom_fox is what you are looking for: http://lists.freebsd.org/pipermail/freebsd-current/2003-June/005288.html but as phk mentions: but since the isp driver has very aggresive retrie policies as it is now, the actual usability is still somewhat below par. i.e. if a request goes to one path, it will never be failed, and not get a change to try the other path... I can't seem to find the recent mailing list messages talking about these issues... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not."