From owner-freebsd-performance@FreeBSD.ORG Thu Oct 23 18:13:56 2008 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E5A83106567A for ; Thu, 23 Oct 2008 18:13:56 +0000 (UTC) (envelope-from cswiger@mac.com) Received: from asmtpout019.mac.com (asmtpout019.mac.com [17.148.16.94]) by mx1.freebsd.org (Postfix) with ESMTP id D3C558FC37 for ; Thu, 23 Oct 2008 18:13:56 +0000 (UTC) (envelope-from cswiger@mac.com) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Received: from cswiger1.apple.com ([17.227.140.124]) by asmtp019.mac.com (Sun Java(tm) System Messaging Server 6.3-7.03 (built Aug 7 2008; 32bit)) with ESMTPSA id <0K9700C71BTG8U20@asmtp019.mac.com> for freebsd-performance@freebsd.org; Thu, 23 Oct 2008 10:12:52 -0700 (PDT) Message-id: From: Chuck Swiger To: Stephen Sanders In-reply-to: <490097CC.9010802@opnet.com> Date: Thu, 23 Oct 2008 10:12:52 -0700 References: <490097CC.9010802@opnet.com> X-Mailer: Apple Mail (2.929.2) Cc: freebsd-performance@freebsd.org Subject: Re: Disk Throughput test X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 23 Oct 2008 18:13:57 -0000 On Oct 23, 2008, at 8:27 AM, Stephen Sanders wrote: > We have an application that is streaming data to disk at the maximum > rate the controller can sustain. The controller should be able to > develop something on the order of 600MB/s but we're only getting > 450MB/s. Are you using RAID-5 or RAID-10 config? RAID-5 is best suited for read-only or read-mostly volumes; if you are doing an even mix RAID-1/10 will generally perform better. > The application writes about 50GB into a file, closes the file, and > then > starts another file. > > I've set all of the recommended settings from 3ware. I have tried > various settings for vfs.hirunningspace - various settings include > everything from 5MB to the cache size of the card (256MB). > > Does anyone know if there is some file system performance limit? You can also try running diskinfo -t to look for raw performance numbers; if they are much different from the bandwidth your app is getting, perhaps you need to tune your app... Regards, -- -Chuck