From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: Reshaping the length of devices Date: Fri, 12 Mar 2010 16:54:41 +0000 Message-ID: <4B9A71D1.108@anonymous.org.uk> References: <678411.30301.qm@web51307.mail.re2.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <678411.30301.qm@web51307.mail.re2.yahoo.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid List-Id: linux-raid.ids On 12/03/2010 15:18, Jon Hardcastle wrote: > > > --- On Fri, 12/3/10, Asdo wrote: > >> From: Asdo >> Subject: Reshaping the length of devices >> To: "linux-raid" >> Date: Friday, 12 March, 2010, 15:15 >> I am wondering... is it possible to >> reshape the length of the underlying devices with MD raid? >> >> I mean like in the case one buys larger disks: after moving >> the raid partitions to the new disks half of them is still >> free. So one might want to extend the raid partitions to the >> end of the disks instead of creating another array in the >> free space. >> >> I have searched the linux-raid mailing list history but I >> couldn't find this topic. >> >> Thanks in advance > > As long as the size of ALL underlying devices have increased you can --grow=MAX to the a multiple of the now smallest drive. Hmm, that reminds me I was meaning to ask - before I have to go to a customer's premises and try it - if I have a CentOS 5 system with 0.90 metadata and type fd partitions with RAID-5 over 3 discs, and I want to grow it by replacing the drives, if I dd small partitions onto larger ones and reboot, will the system recognise the RAID-5 - which now has its metadata somewhere in the middle of the paritions not at the end - so that I can then --grow? Cheers, John.