Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750825AbWAUACN (ORCPT ); Fri, 20 Jan 2006 19:02:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750816AbWAUACN (ORCPT ); Fri, 20 Jan 2006 19:02:13 -0500 Received: from mx1.redhat.com ([66.187.233.31]:43729 "EHLO mx1.redhat.com") by vger.kernel.org with ESMTP id S1750804AbWAUACL (ORCPT ); Fri, 20 Jan 2006 19:02:11 -0500 Date: Sat, 21 Jan 2006 01:01:42 +0100 From: Heinz Mauelshagen To: Lars Marowsky-Bree Cc: Heinz Mauelshagen , Neil Brown , Phillip Susi , Jan Engelhardt , "Lincoln Dale (ltd)" , Michael Tokarev , linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org, "Steinar H. Gunderson" Subject: Re: [PATCH 000 of 5] md: Introduction Message-ID: <20060121000142.GR2801@redhat.com> Reply-To: mauelshagen@redhat.com References: <26A66BC731DAB741837AF6B2E29C1017D47EA0@xmb-hkg-413.apac.cisco.com> <17358.52476.290687.858954@cse.unsw.edu.au> <43D00FFA.1040401@cfl.rr.com> <17360.5011.975665.371008@cse.unsw.edu.au> <43D02033.4070008@cfl.rr.com> <17360.9233.215291.380922@cse.unsw.edu.au> <20060120183621.GA2799@redhat.com> <20060120225724.GW22163@marowsky-bree.de> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20060120225724.GW22163@marowsky-bree.de> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2034 Lines: 53 On Fri, Jan 20, 2006 at 11:57:24PM +0100, Lars Marowsky-Bree wrote: > On 2006-01-20T19:36:21, Heinz Mauelshagen wrote: > > > > Then 'dmraid' (or a similar tool) can use 'dm' interfaces for some > > > raid levels and 'md' interfaces for others. > > Yes, that's possible but there's recommendations to have a native target > > for dm to do RAID5, so I started to implement it. > > Can you answer me what the recommendations are based on? Partner requests. > > I understand wanting to manage both via the same framework, but > duplicating the code is just ... wrong. > > What's gained by it? > > Why not provide a dm-md wrapper which could then > load/interface to all md personalities? > As we want to enrich the mapping flexibility (ie, multi-segment fine grained mappings) of dm by adding targets as we go, a certain degree and transitional existence of duplicate code is the price to gain that flexibility. > > Sincerely, > Lars Marowsky-Br?e > > -- > High Availability & Clustering > SUSE Labs, Research and Development > SUSE LINUX Products GmbH - A Novell Business -- Charles Darwin > "Ignorance more frequently begets confidence than does knowledge" Warm regards, Heinz -- The LVM Guy -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Heinz Mauelshagen Red Hat GmbH Consulting Development Engineer Am Sonnenhang 11 Cluster and Storage Development 56242 Marienrachdorf Germany Mauelshagen@RedHat.com +49 2626 141200 FAX 924446 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/