From owner-freebsd-hackers@FreeBSD.ORG Thu Sep 16 01:18:54 2004 Return-Path: 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 C2D3C16A4CE for ; Thu, 16 Sep 2004 01:18:54 +0000 (GMT) Received: from dan.emsphone.com (dan.emsphone.com [199.67.51.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7AD1743D45 for ; Thu, 16 Sep 2004 01:18:54 +0000 (GMT) (envelope-from dan@dan.emsphone.com) Received: (from dan@localhost) by dan.emsphone.com (8.12.11/8.12.11) id i8G1IdOj025968; Wed, 15 Sep 2004 20:18:39 -0500 (CDT) (envelope-from dan) Date: Wed, 15 Sep 2004 20:18:39 -0500 From: Dan Nelson To: Paul Message-ID: <20040916011838.GB29528@dan.emsphone.com> References: <1095262830.10708.2.camel@paul> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1095262830.10708.2.camel@paul> X-OS: FreeBSD 5.3-BETA3 X-message-flag: Outlook Error User-Agent: Mutt/1.5.6i cc: freebsd-hackers@freebsd.org Subject: Re: FibreChannel support X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 16 Sep 2004 01:18:54 -0000 In the last episode (Sep 15), Paul said: > Is there anyone using fibrechannel SAN solutions with FreeBSD ? I had a FreeBSD running on a SAN using qlogic cards a few months back but had to put Linux on it. It works fine. > I have a couple questions: > > 1) Is concurrent access possible ? Like in a server cluster > csenario where multiple servers share the same LUN ? You can whare the LUN, but only one system can have the filesystem mounted. There are no shared-storage filesystems for FreeBSD (and I don't really trust the ones for Linux yet). The easiest setup is an active/passive system, where the master has the fs mounted and holds an aliased IP. When it fails, the slave mounts the volume and grabs the IP. That should allow remote NFS access at least to continue transparently. > 2) Is there a way to grow partitions when more drives are added to > the SAN array ? Sure. If don't put any FDISK or disklabel partitions on the lun (i.e. you put the filesystem directly on /dev/da#), it's really easy. Dismount the volume, run "camcontrol rescan da#" to let the system detect the new size, run "growfs /mountpoint", remount. -- Dan Nelson dnelson@allantgroup.com