From owner-freebsd-questions@FreeBSD.ORG Wed Oct 6 10:21:59 2004 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 13E7C16A4CE for ; Wed, 6 Oct 2004 10:21:59 +0000 (GMT) Received: from geofront.co.uk (port-179.dolphin.c4l.co.uk [80.253.114.179]) by mx1.FreeBSD.org (Postfix) with ESMTP id C0C6543D55 for ; Wed, 6 Oct 2004 10:21:57 +0000 (GMT) (envelope-from Mike@the-rubber-chicken-network.co.uk) Received: from [132.147.16.46] ([195.194.75.70]) by geofront.co.uk (8.12.9/8.12.6) with ESMTP id i96APOpc057260; Wed, 6 Oct 2004 11:25:24 +0100 (BST) (envelope-from Mike@the-rubber-chicken-network.co.uk) Message-ID: <4163C73A.6070803@the-rubber-chicken-network.co.uk> Date: Wed, 06 Oct 2004 11:21:46 +0100 From: Mike Woods User-Agent: Mozilla Thunderbird 0.7.2 (Windows/20040707) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Yui Sakazume References: <20041006.191834.229740712.saka@sgi.co.jp> In-Reply-To: <20041006.191834.229740712.saka@sgi.co.jp> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new cc: freebsd-questions@freebsd.org Subject: Re: RAID performance X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Oct 2004 10:21:59 -0000 Yui Sakazume wrote: >Hello, > >I have installed FreeBSD-4.10 to NEC Express5800 120R. >I attached LSI Logic MegaRAID SATA 150-6 with six SATA disks. >And configure RAID 5 LUN. >But, I/O prformance is poor(about 5MB/s). > >Is amr suitable for MegaRAID SATA 150-6 ? >Please tell me newfs parameters if there is recommendation. > > Write operations on raid 5 take a massive performance hit, most controllers will try to compensate with caching tricks but i suspect this could well be the cause of your problems. -------------- Mike Woods IT Technician