From mboxrd@z Thu Jan 1 00:00:00 1970 From: keld@keldix.com Subject: Re: RAID 10 far and offset on-disk layouts Date: Fri, 27 Dec 2013 16:49:52 +0100 Message-ID: <20131227154952.GA6539@www5.open-std.org> References: <52BD8EDD.10809@assyoma.it> <20131227151927.GA4003@www5.open-std.org> <52BD9B4F.3000509@assyoma.it> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <52BD9B4F.3000509@assyoma.it> Sender: linux-raid-owner@vger.kernel.org To: Gionatan Danti Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, Dec 27, 2013 at 04:22:55PM +0100, Gionatan Danti wrote: > > >On Fri, Dec 27, 2013 at 03:29:49PM +0100, Gionatan Danti wrote: > >The wikipedia description is what you get for new arrays with newer > >kernels, while the suse documentation is what you will get with older > >kernels. > >The wikipedia layout was made because there are better chances of recovery, > >Chances went from 1/3 to 2/3 with eg 4 drives, when 2 drives were failing. > > > >I would say that the Suse description is just not updated. > > > >Best regards > >Keld > > > > Interesting. Two question: > 1) from which kernel the layout is the one depicted by Wikipedia? > 2) it is possible, using mdadm, check what "far" layout is in use? I cannot answer that. Neil Brown should know. Best regards Keld