From owner-freebsd-hardware@FreeBSD.ORG Tue Nov 15 22:55:34 2005 Return-Path: X-Original-To: hardware@freebsd.org Delivered-To: freebsd-hardware@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7E6A616A41F; Tue, 15 Nov 2005 22:55:34 +0000 (GMT) (envelope-from mi+mx@aldan.algebra.com) Received: from vms046pub.verizon.net (vms046pub.verizon.net [206.46.252.46]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0560D43D45; Tue, 15 Nov 2005 22:55:29 +0000 (GMT) (envelope-from mi+mx@aldan.algebra.com) Received: from corbulon.video-collage.com ([151.204.231.237]) by vms046.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IQ000B9UQAO0G0C@vms046.mailsrvcs.net>; Tue, 15 Nov 2005 16:54:25 -0600 (CST) Received: from mteterin.us.murex.com (195-11.customer.cloud9.net [168.100.195.11]) by corbulon.video-collage.com (8.13.4/8.13.1) with ESMTP id jAFMsN0r027793 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Tue, 15 Nov 2005 17:54:23 -0500 Received: from mteterin.us.murex.com (mteterin@localhost [127.0.0.1]) by mteterin.us.murex.com (8.13.4/8.13.4) with ESMTP id jAFMsHhD042248; Tue, 15 Nov 2005 17:54:17 -0500 Received: from localhost (localhost [[UNIX: localhost]]) by mteterin.us.murex.com (8.13.4/8.13.4/Submit) id jAFMsGkv042122; Tue, 15 Nov 2005 17:54:16 -0500 Date: Tue, 15 Nov 2005 17:54:16 -0500 From: Mikhail Teterin To: hardware@freebsd.org Message-id: <200511151754.16440.mi+mx@aldan.algebra.com> Organization: Virtual Estates, Inc. MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit Content-disposition: inline X-Virus-Scanned: ClamAV devel-20050525/1175/Tue Nov 15 12:50:47 2005 on corbulon.video-collage.com X-Virus-Status: Clean X-Scanned-By: MIMEDefang 2.43 X-Authentication-warning: mteterin.us.murex.com: mteterin set sender to mi+mx@aldan.algebra.com using -f User-Agent: KMail/1.8.2 Cc: emoore@freebsd.org Subject: very poor performance of LSILogic's SATA 150-6D (RAID5) X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 15 Nov 2005 22:55:34 -0000 Hello! We are observing very low performance of the 5- and 6-drive RAID5 array on the LSILogic. For formal comparision we created two logical drives -- a 5-drive RAID5 and a 1-drive RAID0. (All 6 disks are identical 200Gb Western Digital). According to iozone, the 5-drive RAID5 gets from 3 to 8 Mb/s. The 1-drive RAID0 goes from 20 to 50Mb/s. Now, the controller has no battery and thus is not allowed to cache much, but is the difference really supposed to be so great? It has 5 disks at its disposal, after all... -mi