From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <3ABA91DE.29985185@tnonline.net> Date: Fri, 23 Mar 2001 00:59:26 +0100 From: Anders Widman MIME-Version: 1.0 Subject: Re: [linux-lvm] LVM and fault tolerance References: Content-Transfer-Encoding: 7bit Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@sistina.com Lars Kellogg-Stedman wrote: > > Is there any possibility to add fault tolerance to LVM. I would like > > to span several disks (of different sizes) and have fault tolerance to > > it. Also, most important, is to be able to extend it with additional > > disks without loosing data. > > Disclaimer: I've only recently started working with LVM under Linux. > > That said, I think that the general solution to fault tolerance is to > combine LVM with either (a) the software RAID (md) subsystem, or (b) > hardware RAID devices. > Well, it will have to be software RAID (limited budget) > > For example, you can create a number of md devices, using RAID1 or RAID5 > for fault tolerance, and then run pvcreate on them and manage them with > lvm. > > I'm doing this right now with a 4-disk RAID5 array (3 disks + 1 hot > spare), and it seems to be working just fine. > So, how is this actually working then. Let say I have this disk configuration: 2x 40gb 2x 60gb 2x 80gb I want maximum amount of diskspace available for storage. High speed is not needed at all as this is mainly for storage and streaming low bitrate media. Still, I need to be able to add additional disks, maybe two extra 80gb disks. Would it be possible to keep ecc/crc data on one disk only, or stripe it over all disks. Mirroring is to expensive in this sence too. The problem with RAID-5 is that all disks need to be of the same size and that it is not expandable (or is it?). //Anders > > -- Lars > > -- > Lars Kellogg-Stedman > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm