From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: Raid5 to another raid level?? Date: Thu, 01 Sep 2011 23:34:46 +0100 Message-ID: <4E600886.9080600@anonymous.org.uk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Michael Busby Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 01/09/2011 22:50, Michael Busby wrote: > I have found the following and see that you can convert from raid4 to > raid0 fairly easy > > > http://ubuntuforums.org/showpost.php?p=10412231&postcount=20 > > i have a 2 disk raid5 and want to be able to convert this to raid0, i > was thinking of adding a extra 2 disk and setting them up as raid0, > moving the data over then adding the original raid5 disks to the raid0 > setup, but i see that you are unable to add disk to a raid0 setup, > would it be possible to setup a raid4 with 2 disks and 1 missing, move > the data from the raid5 to raid4 then add both of the original disks > to the raid4 the downgrade this to raid0??? Off the top of my head, feeling slightly sozzled (been for a few beers), this might work, but as your linked post referring to a list reply from Neil Brown says, you should test first. You could use some USB sticks, or alternatively loopback devices are ideal for this kind of test. Cheers, John.