From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263570AbTJQRog (ORCPT ); Fri, 17 Oct 2003 13:44:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263571AbTJQRog (ORCPT ); Fri, 17 Oct 2003 13:44:36 -0400 Received: from main.gmane.org ([80.91.224.249]:5021 "EHLO main.gmane.org") by vger.kernel.org with ESMTP id S263570AbTJQRoe (ORCPT ); Fri, 17 Oct 2003 13:44:34 -0400 X-Injected-Via-Gmane: http://gmane.org/ To: linux-kernel@vger.kernel.org From: mru@users.sourceforge.net (=?iso-8859-1?q?M=E5ns_Rullg=E5rd?=) Subject: Re: Software RAID5 with 2.6.0-test Date: Fri, 17 Oct 2003 19:44:31 +0200 Message-ID: References: <1065690658.10389.19.camel@slurv> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Complaints-To: usenet@sea.gmane.org User-Agent: Gnus/5.1002 (Gnus v5.10.2) XEmacs/21.4 (Rational FORTRAN, linux) Cancel-Lock: sha1:RJf7p63iwQdjxJxq7IcI5Vo3K6c= Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Bill Davidsen writes: >> However, I wouln't count on superior performance from software based >> RAID 5 (ata/fakeraid or otherwise), that is whats real raid controllers >> are for. > > While an overloaded system may benefit from offloaded the CPU > requirements of RAID, unless you go to a very expensive external unit > the kernel RAID will usually outperform the inexpensive RAID embedded on > a controller. The kernel simply knows more about the data needs and can > can do things a controller can't. What about the RAID controllers in the $400 category? Surely, they must be doing something better than the $50 fakeraid controllers. -- Måns Rullgård mru@users.sf.net