From owner-freebsd-questions@FreeBSD.ORG Tue Apr 22 18:29:26 2003 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 1998237B401 for ; Tue, 22 Apr 2003 18:29:26 -0700 (PDT) Received: from pa-plum1b-166.pit.adelphia.net (pa-plum1a-215.pit.adelphia.net [24.53.170.215]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3C78C43F3F for ; Tue, 22 Apr 2003 18:29:25 -0700 (PDT) (envelope-from wmoran@potentialtech.com) Received: from potentialtech.com (working [172.16.0.95]) h3N1TN0n000279; Tue, 22 Apr 2003 21:29:24 -0400 (EDT) (envelope-from wmoran@potentialtech.com) Message-ID: <3EA5EC73.1020502@potentialtech.com> Date: Tue, 22 Apr 2003 21:29:23 -0400 From: Bill Moran User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.2.1) Gecko/20030301 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Josh Paetzel References: <20030422170114.GG37008@ns1.webwarrior.net> In-Reply-To: <20030422170114.GG37008@ns1.webwarrior.net> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: questions@freebsd.org Subject: Re: Disk Performance Issues 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, 23 Apr 2003 01:29:26 -0000 Josh Paetzel wrote: > I've got a FreeBSD 4.8-STABLE system with a Maxtor 6L040J2 ATA/133 7200 RPM > IDE OS drive in it on a gigabtye GA-7VRXP motherboard. I've also got a pair > of Western Digital WD800BB 7200 RPM ATA/100 drives in RAID 1 on an onboard > Promise 20276 ATA/133 RAID Controller. > > atacontrol reports that all the drives are being properly probed: > > ===root@markx ('tty') /storage/os_isos -> atacontrol mode 0 > Master = UDMA133 > Slave = ??? > ===root@markx ('tty') /storage/os_isos -> atacontrol mode 1 > Master = PIO4 > Slave = PIO4 > ===root@markx ('tty') /storage/os_isos -> atacontrol mode 2 > Master = UDMA100 > Slave = ??? > ===root@markx ('tty') /storage/os_isos -> atacontrol mode 3 > Master = UDMA100 > Slave = ??? > > > My issue is that I'm seeing sustained transfer rates on 600-700 meg files in > the 5-6 Meg/second range...about 1/4 of what the drives are capable of. Does > anyone have any advice on where to go from here in troubleshooting this issue? You're reading the specs wrong. That drive is not capable of sustained through- put of 133mb/s. According to the data sheet, it can only do 44mb/s sustained. That seems to be about what you're getting. The ATA133 interface will only go at 133 until the drive's buffers fill up, then it has to slow down to match the actual speed the drive can transfer data to/from the platters. Some of the higher-end SCSI drives are capable of sustained speeds that high, but I don't know of any 7200 RPM drives that can touch it. Maxtor makes a 15000 RPM drive that can (purportedly) sustain 75megabytes/sec. (wow!) -- Bill Moran Potential Technologies http://www.potentialtech.com