From owner-freebsd-scsi@FreeBSD.ORG  Fri Jan  9 06:13:26 2009
Return-Path: <owner-freebsd-scsi@FreeBSD.ORG>
Delivered-To: freebsd-scsi@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 9FA98106566B
	for <freebsd-scsi@freebsd.org>; Fri,  9 Jan 2009 06:13:26 +0000 (UTC)
	(envelope-from gpalmer@freebsd.org)
Received: from noop.in-addr.com (mail.in-addr.com [IPv6:2001:470:8:162::1])
	by mx1.freebsd.org (Postfix) with ESMTP id 7770D8FC14
	for <freebsd-scsi@freebsd.org>; Fri,  9 Jan 2009 06:13:26 +0000 (UTC)
	(envelope-from gpalmer@freebsd.org)
Received: from gjp by noop.in-addr.com with local (Exim 4.54 (FreeBSD))
	id 1LLAcW-0002OP-JD; Fri, 09 Jan 2009 01:13:24 -0500
Date: Fri, 9 Jan 2009 01:13:24 -0500
From: Gary Palmer <gpalmer@freebsd.org>
To: Andrew Snow <andrew@modulus.org>
Message-ID: <20090109061324.GD81380@in-addr.com>
References: <496634BB.9050902@dotcom.ts.it> <4966A25E.4070803@modulus.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <4966A25E.4070803@modulus.org>
Cc: freebsd-scsi@freebsd.org
Subject: Re: ISCSI and multipath
X-BeenThere: freebsd-scsi@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SCSI subsystem <freebsd-scsi.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-scsi>,
	<mailto:freebsd-scsi-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-scsi>
List-Post: <mailto:freebsd-scsi@freebsd.org>
List-Help: <mailto:freebsd-scsi-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-scsi>,
	<mailto:freebsd-scsi-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 09 Jan 2009 06:13:27 -0000

On Fri, Jan 09, 2009 at 12:03:26PM +1100, Andrew Snow wrote:
> Sossi Andrej wrote:
> >Another question about MD3000i.
> >My MD3000i have 2 controller and every controller have 2 net interface.
> >My FreeBSD server is connect on NAS server with 2 network cards throw 
> >out 2 switch on th 2 networks. (192.168.253.X and 192.168.252.X).
> >In the official manual is written if the primary controller (or net) 
> >have a problem the NAS automatically switch disks drive on second 
> >controller. For this is required MPIO on Windows or MPP on Linux. It is 
> >supported also on FreeBSD?
> 
> If you only wanted to do failover at the network level with shared IP 
> address, you could use lagg.
> 
> However, since you have different IP subnets for each network, you 
> probably want to look at using geom_fox.  You set up two iSCSI 
> connections, one to each controller, and geom_fox on top to make it 
> appear as a single disk device.

FreeBSD 7.0 and later also has geom_multipath, which I've been
told (no experience) is a better approach.  I suggest you 
review documentation for both and make your own decision

Regards,

Gary