From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx2.redhat.com (mx2.redhat.com [10.255.15.25]) by int-mx2.corp.redhat.com (8.13.1/8.13.1) with ESMTP id l2N1WMA1004430 for ; Thu, 22 Mar 2007 21:32:22 -0400 Received: from mail.bmsi.com (www.bmsi.com [24.248.44.156]) by mx2.redhat.com (8.13.1/8.13.1) with ESMTP id l2N1WK0d018941 for ; Thu, 22 Mar 2007 21:32:20 -0400 Received: from bmsred.bmsi.com (bmsred.bmsi.com [192.168.9.50]) by mail.bmsi.com (8.13.6/8.13.6) with ESMTP id l2N1WEql009368 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO) for ; Thu, 22 Mar 2007 21:32:14 -0400 Received: from localhost (localhost [127.0.0.1]) by bmsred.bmsi.com (8.13.5/8.13.5) with ESMTP id l2N1WEVG017864 for ; Thu, 22 Mar 2007 21:32:14 -0400 Date: Thu, 22 Mar 2007 21:32:14 -0400 (EDT) From: "Stuart D. Gathman" Subject: Re: [linux-lvm] failing hard drive In-Reply-To: <200703221633.05727.peregrine@openbrainstem.net> Message-ID: MIME-Version: 1.0 Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: TEXT/PLAIN; charset="us-ascii" Content-Transfer-Encoding: 7bit To: LVM general discussion and development On Thu, 22 Mar 2007, Lamont Peterson wrote: > If you're not using RAID, might I suggest that you do? Those 9 disks would > make a nice RAID5 or RAID6 array, and LVM works beautifully on top of > software RAID, hardware RAID or any combination of both. > > LVM does not provide redundancy (yes, I know it can do mirroring, but I > wouldn't suggest that), it's about easily managing lots of storage space. > RAID is about reliability/redundancy. Use the right tool for the right job, > and use both tools together to get all the best benefits of both. In my use, reliability is paramount. So I prefer RAID1. You get a performance boost for reads as well. The md based mirrors can be mounted separately (careful!) if needed for data recovery and bug workarounds. (E.g. On Centos-3 grub won't install on mirrored boot partition. So unmount md0, setfaulty hdb1, mount hda1 /boot, grub-install, umount hda1, mount md0, raidhotadd hdb1.) RAID5 arrays can only be accessed as raid. -- Stuart D. Gathman Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154 "Confutatis maledictis, flammis acribus addictis" - background song for a Microsoft sponsored "Where do you want to go from here?" commercial.