From owner-freebsd-performance@FreeBSD.ORG Thu Oct 23 18:11:41 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 725E2106567A for ; Thu, 23 Oct 2008 18:11:41 +0000 (UTC) (envelope-from ssanders@softhammer.net) Received: from enterprise58.opnet.com (enterprise58.opnet.com [192.104.65.21]) by mx1.freebsd.org (Postfix) with ESMTP id 3A0AD8FC21 for ; Thu, 23 Oct 2008 18:11:41 +0000 (UTC) (envelope-from ssanders@softhammer.net) Received: from [172.16.12.251] (wtn12251.opnet.com [172.16.12.251]) by enterprise58.opnet.com (8.13.6/8.12.10) with ESMTP id m9NGlKY6009995; Thu, 23 Oct 2008 12:47:20 -0400 Message-ID: <4900B94B.5000108@softhammer.net> Date: Thu, 23 Oct 2008 13:50:03 -0400 From: Stephen Sanders User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: Chuck Swiger References: <490097CC.9010802@opnet.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-OPNET-MailScanner: Found to be clean X-MailScanner-From: ssanders@softhammer.net 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 18:11:41 -0000 Good point about the RAID. It is set for RAID 5 as the data is supposed to be protected. Interestingly enough, diskinfo is telling me that the drive throughput is 175MB/s. I'm guessing that this means diskinfo is a mixture of reads and writes? Thanks Chuck Swiger wrote: > 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,