Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161050AbWARXTh (ORCPT ); Wed, 18 Jan 2006 18:19:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161048AbWARXTh (ORCPT ); Wed, 18 Jan 2006 18:19:37 -0500 Received: from mx1.suse.de ([195.135.220.2]:16520 "EHLO mx1.suse.de") by vger.kernel.org with ESMTP id S1161047AbWARXTg (ORCPT ); Wed, 18 Jan 2006 18:19:36 -0500 From: Neil Brown To: Jan Engelhardt Date: Thu, 19 Jan 2006 10:19:24 +1100 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17358.52476.290687.858954@cse.unsw.edu.au> Cc: "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 In-Reply-To: message from Jan Engelhardt on Wednesday January 18 References: <26A66BC731DAB741837AF6B2E29C1017D47EA0@xmb-hkg-413.apac.cisco.com> X-Mailer: VM 7.19 under Emacs 21.4.1 X-face: v[Gw_3E*Gng}4rRrKRYotwlE?.2|**#s9D > >personally, I think this this useful functionality, but my personal > >preference is that this would be in DM/LVM2 rather than MD. but given > >Neil is the MD author/maintainer, I can see why he'd prefer to do it in > >MD. :) > > Why don't MD and DM merge some bits? > Which bits? Why? My current opinion is that you should: Use md for raid1, raid5, raid6 - anything with redundancy. Use dm for multipath, crypto, linear, LVM, snapshot Use either for raid0 (I don't think dm has particular advantages for md or md over dm). These can be mixed together quite effectively: You can have dm/lvm over md/raid1 over dm/multipath with no problems. If there is functionality missing from any of these recommended components, then make a noise about it, preferably but not necessarily with code, and it will quite possibly be fixed. NeilBrown - 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/