From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Allen Subject: Re: Multiple raids on one machine? Date: Tue, 27 Jun 2006 12:33:55 +0100 Message-ID: <44A117A3.5040203@cjx.com> References: <449F100D.6030509@cjx.com> <871wtahqgo.fsf@hades.wkstn.nix> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <871wtahqgo.fsf@hades.wkstn.nix> Sender: linux-raid-owner@vger.kernel.org To: Nix Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Nix wrote: > On 25 Jun 2006, Chris Allen uttered the following: >> Back to my 12 terabyte fileserver, I have decided to split the storage >> into four partitions each of 3TB. This way I can choose between XFS >> and EXT3 later on. >> >> So now, my options are between the following: >> >> 1. Single 12TB /dev/md0, partitioned into four 3TB partitions. But how do >> I do this? fdisk won't handle it. Can GNU Parted handle partitions this big? >> >> 2. Partition the raw disks into four partitions and make /dev/md0,md1,md2,md3. >> But am I heading for problems here? Is there going to be a big performance hit >> with four raid5 arrays on the same machine? Am I likely to have dataloss problems >> if my machine crashes? > > There is a third alternative which can be useful if you have a mess of > drives of widely-differing capacities: make several RAID arrays so as to tesselate > space across all the drives, and then pile an LVM on the top of all of them to > fuse them back into one again. > But won't I be stuck with the same problem? ie I'll have a single 12TB lvm, and won't be able to use EXT3 on it?