From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mirko Benz Subject: LSI megaraid sas performance Date: Wed, 10 May 2006 16:03:44 +0200 Message-ID: <4461F2C0.3090903@web.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from 162.237.80.212.versanetonline.de ([212.80.237.162]:10412 "EHLO cheetah.dd.xiranet.com") by vger.kernel.org with ESMTP id S1751393AbWEJOEA (ORCPT ); Wed, 10 May 2006 10:04:00 -0400 Received: from [192.168.0.242] (dhcp242.dd.xiranet.com [192.168.0.242]) (authenticated bits=0) by cheetah.dd.xiranet.com (8.13.4/8.13.4/Debian-1) with ESMTP id k4AE3oiT001856 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Wed, 10 May 2006 16:03:54 +0200 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Hello, We are testing the LSI 8480E SAS RAID controller with the following setup: - Dual XEON server, 1 GB RAM - 12 SATA II disks in Promise J300S SAS JBOD connected with a single x4 SAS cable - stripe size is 64k, write back caching enabled Measured with IOMETER. First two values are for read/write with 64 kb block size with sequential I/O. Default test is RANDOM I/O 2/3 read + 1/3 write at 2k block size. - Windows 2003 Server-64 bit: RAID 0 - R: 606 MB/s, W: 335 MB/s, Default: 820 IOPS RAID 5 - R: 593 MB/s, W: 304 MB/s, Default: 475 IOPS //RAID 0 write should be better but otherwise ok - Linux 2.6.16.9-64 bit: RAID 0 - R: 165 MB/s, W: 373 MB/s, Default: 76 IOPS RAID 5 - R: 147 MB/s, W: 285 MB/s, Default: 74 IOPS READ performance is bad. Random I/O is like a single disk. The 8408 (internal version) shows the same behaveour. Has anyone else results for this controller or suggestions to improve this? Thanks, Mirko