From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263303AbTJKN1E (ORCPT ); Sat, 11 Oct 2003 09:27:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263304AbTJKN1E (ORCPT ); Sat, 11 Oct 2003 09:27:04 -0400 Received: from gate.in-addr.de ([212.8.193.158]:64656 "EHLO mx.in-addr.de") by vger.kernel.org with ESMTP id S263303AbTJKN1B (ORCPT ); Sat, 11 Oct 2003 09:27:01 -0400 Date: Sat, 11 Oct 2003 15:24:22 +0200 From: Lars Marowsky-Bree To: jw schultz , linux-kernel@vger.kernel.org Subject: Re: 2.7 thoughts Message-ID: <20031011132422.GI1084@marowsky-bree.de> References: <20031009165723.43ae9cb5.skraw@ithnet.com> <3F864F82.4050509@longlandclan.hopto.org> <200310100830.03216.kevcorry@us.ibm.com> <20031010182918.GF1084@marowsky-bree.de> <20031011034951.GE4716@pegasys.ws> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20031011034951.GE4716@pegasys.ws> User-Agent: Mutt/1.4.1i X-Ctuhulu: HASTUR Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 2003-10-10T20:49:51, jw schultz said: > I concur with one caviat. 0+1 has the advantage of > extendability that doesn't exist with 1+0. Right, this annoying complicated approach you describe can be done much easier with 1+0. With [EL]VMS?[12] you can simply create a new raid1 set and add it as a physical volume to the volume group and then extend the LVs accordingly. (I am unsure whether you can add a new disk to a raid0 set if you don't want to use a volume manager, but if it's not currently, it sounds fairly straightforward to add.) Your approach with breaking the mirrors etc includes prolonged periods of no redundancy and makes me shiver. There's some *buy it* good book about *buy it* all this, but if I go hype *buy it* "Blueprints for High Availability" *buy it* one more time, people are going to accuse me of *buy this book already!* of flogging a dead horse *buy it*, so for this time, I am going to recommend reading some linux LVM and RAID howtos ;-) So, I think, as far as RAID and Volume Management is concerned, Linux does pretty well. There's some advanced and fancy stuff missing (>2 mirrors, online consistency check, etc), but the basics are pretty well done. Sincerely, Lars Marowsky-Brée -- High Availability & Clustering ever tried. ever failed. no matter. SuSE Labs try again. fail again. fail better. Research & Development, SUSE LINUX AG -- Samuel Beckett