From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752230AbYE1Rd6 (ORCPT ); Wed, 28 May 2008 13:33:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751983AbYE1Rdr (ORCPT ); Wed, 28 May 2008 13:33:47 -0400 Received: from lucidpixels.com ([75.144.35.66]:41620 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751751AbYE1Rdq (ORCPT ); Wed, 28 May 2008 13:33:46 -0400 Date: Wed, 28 May 2008 13:33:46 -0400 (EDT) From: Justin Piszcz To: =?ISO-8859-15?Q?Jens_B=E4ckman?= cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, xfs@oss.sgi.com Subject: Re: Performance Characteristics of All Linux RAIDs (mdadm/bonnie++) In-Reply-To: <95711f160805280934y77ed7d91tec5aeb531bf8013c@mail.gmail.com> Message-ID: References: <95711f160805280934y77ed7d91tec5aeb531bf8013c@mail.gmail.com> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="-1463747160-2044578589-1211996026=:29755" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1463747160-2044578589-1211996026=:29755 Content-Type: TEXT/PLAIN; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE On Wed, 28 May 2008, Jens B=E4ckman wrote: > On Wed, May 28, 2008 at 10:53 AM, Justin Piszcz = wrote: >> Results: >> >> http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.html >> http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.txt > > Either the RAID 1 read speed must be wrong, or something is odd in the > Linux implementation. There's six drives that can be used for reading > at the same time, as they contain the very same data. 63MB/s > sequential looks like what you would get from a single drive. > The RAID1 is correct. As has been discussed on this list before, you will= =20 only see raid speed > 1 disk if you run 2(?, or 3 minimal) threads=20 from the same device (raid1). Justin. ---1463747160-2044578589-1211996026=:29755--