X-Original-To: pgsql-performance-postgresql.org@postgresql.org Received: from wm.hub.org (wm.hub.org [200.46.204.128]) by postgresql.org (Postfix) with ESMTP id 78E499FA49D for ; Sat, 16 Sep 2006 02:23:12 -0300 (ADT) Received: from maia (wm.hub.org [200.46.204.128]) by wm.hub.org (Postfix) with ESMTP id 6FB4FDFA12C for ; Sat, 16 Sep 2006 05:23:12 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey- Received: from mail.mi8.com (d01gw04.mi8.com [63.240.6.44]) by postgresql.org (Postfix) with ESMTP id CDA1D9F9F3D for ; Fri, 15 Sep 2006 00:53:44 -0300 (ADT) Received: from 172.16.1.148 by mail.mi8.com with ESMTP (- Welcome to Mi8 Corporation www.Mi8.com (D4)); Thu, 14 Sep 2006 23:53:38 -0400 X-Server-Uuid: C8FB4D43-1108-484A-A898-3CBCC7906230 Received: from MI8NYCMAIL06.Mi8.com ([172.16.1.175]) by D01HOST02.Mi8.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 14 Sep 2006 23:51:45 -0400 Received: from 69.181.100.71 ([69.181.100.71]) by MI8NYCMAIL06.Mi8.com ( [172.16.1.219]) via Exchange Front-End Server mi8owa.mi8.com ( [172.16.1.106]) with Microsoft Exchange Server HTTP-DAV ; Fri, 15 Sep 2006 03:51:44 +0000 User-Agent: Microsoft-Entourage/11.2.5.060620 Date: Thu, 14 Sep 2006 20:51:42 -0700 Subject: Re: RAID 0 not as fast as expected From: "Luke Lonergan" To: "Joshua Drake" cc: "Craig A. James" , pgsql-performance@postgresql.org Message-ID: Thread-Topic: [PERFORM] RAID 0 not as fast as expected Thread-Index: AcbYekFPf60npkRtEduGjAAWy4o9DA== In-Reply-To: <450A226B.6050405@commandprompt.com> MIME-Version: 1.0 X-OriginalArrivalTime: 15 Sep 2006 03:51:45.0468 (UTC) FILETIME=[436107C0:01C6D87A] X-WSS-ID: 6914FC482US5533783-01-01 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Archive-Number: 200609/214 X-Sequence-Number: 20900 Josh, On 9/14/06 8:47 PM, "Joshua D. Drake" wrote: >> I've obtained 1,950 MB/s using Linux software RAID on SATA drives. > > With what? :) Sun X4500 (aka Thumper) running stock RedHat 4.3 (actually CentOS 4.3) with XFS and the linux md driver without lvm. Here is a summary of the results: Read Test RAID Level Max Readahead (KB) RAID Chunksize Max Readahead on Disks (KB) Max Time (s) Read Bandwidth (MB/s) 0 65536 64 256 16.689 1,917.43 0 4096 64 256 21.269 1,504.54 0 65536 256 256 17.967 1,781.04 0 2816 256 256 18.835 1,698.96 0 65536 1024 256 18.538 1,726.18 0 65536 64 512 18.295 1,749.11 0 65536 64 256 18.931 1,690.35 0 65536 64 256 18.873 1,695.54 0 64768 64 256 18.545 1,725.53 0 131172 64 256 18.548 1,725.25 0 131172 64 65536 19.046 1,680.14 0 131172 64 524288 18.125 1,765.52 0 131172 64 1048576 18.701 1,711.14 5 2560 64 256 39.933 801.34 5 16777216 64 256 37.76 847.46 5 524288 64 256 53.497 598.16 5 65536 32 256 38.472 831.77 5 65536 32 256 38.004 842.02 5 65536 32 256 37.884 844.68 5 2560 16 256 41.39 773.13 5 65536 16 256 48.902 654.37 10 65536 64 256 83.256 384.36 1+0 65536 64 256 19.394 1,649.99 1+0 65536 64 256 19.047 1,680.05 1+0 65536 64 256 19.195 1,667.10 1+0 65536 64 256 18.806 1,701.58 1+0 65536 64 256 18.848 1,697.79 1+0 65536 64 256 18.371 1,741.88 1+0 65536 64 256 21.446 1,492.12 1+0 65536 64 256 20.254 1,579.93