From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262799AbTJJNfX (ORCPT ); Fri, 10 Oct 2003 09:35:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262802AbTJJNfX (ORCPT ); Fri, 10 Oct 2003 09:35:23 -0400 Received: from e32.co.us.ibm.com ([32.97.110.130]:10647 "EHLO e32.co.us.ibm.com") by vger.kernel.org with ESMTP id S262799AbTJJNfS (ORCPT ); Fri, 10 Oct 2003 09:35:18 -0400 From: Kevin Corry To: Stuart Longland Subject: Re: 2.7 thoughts Date: Fri, 10 Oct 2003 08:30:03 -0500 User-Agent: KMail/1.5 Cc: linux-kernel@vger.kernel.org References: <20031009165723.43ae9cb5.skraw@ithnet.com> <3F864F82.4050509@longlandclan.hopto.org> In-Reply-To: <3F864F82.4050509@longlandclan.hopto.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200310100830.03216.kevcorry@us.ibm.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Friday 10 October 2003 01:19, Stuart Longland wrote: > - Software RAID 0+1 perhaps? > > A lot of hardware RAID cards support it, why not the > kernel? By RAID 0+1 I mean mirror-RAIDing two (or more) > stripe-RAID arrays. (Or can this be done already?) This can be done already. For example, you have six drives, sd[a-f]. Create md0 (raid-0) using sda, sdb, and sdc. Create md1 (raid-0) using sdd, sde, and sdf. Then create md2 (raid-1) using md0 and md1. This setup can easily be accomplished using evms, mdadm, or raidtools. -- Kevin Corry kevcorry@us.ibm.com http://evms.sourceforge.net/