From mboxrd@z Thu Jan 1 00:00:00 1970 From: Josef 'Jeff' Sipek Subject: Re: How do I tell if my partition is aligned for a 64k/RAID-6? Date: Sat, 27 Dec 2008 08:58:22 -0500 Message-ID: <20081227135822.GI6284@josefsipek.net> References: <495410F4.5010508@ziu.info> <20081227133824.GH6284@josefsipek.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: Michal Soltys , linux-raid@vger.kernel.org, xfs@oss.sgi.com List-Id: linux-raid.ids On Sat, Dec 27, 2008 at 08:53:21AM -0500, Justin Piszcz wrote: > Why bother partitioning? I also run a Linux SW RAID1 on the host, as you > know the drive letters can change when working on a server. > > Example: Before I created the array (RAID-6), my disks were /dev/sda, > /dev/sdb and /dev/sdc (spare), the RAID-6 was /dev/sdd. After reboot, > /dev/sdd became /dev/sda and /dev/sd[a-c] became /dev/sd[b-d]. > > In lilo.conf I had: > raid-extra-boot="/dev/sda,/dev/sdb" > > If I ran LILO and forgot to fix the lilo.conf to reflect the new drive > mappings: > raid-extra-boot="/dev/sdb,/dev/sdc" > > I could be at risk of ruining the partition? Hrm...interesting point. LILO could mess up the superblock in sector 0. > I try to avoid such situations when possible, to be safe. :) I don't know how LILO would handle it, but I would try to use /dev/disk/by-*/* instead of the rather unstable /dev/sd* names. Just my 0.02 cents. Jeff. -- Keyboard not found! Press F1 to enter Setup