From owner-freebsd-hackers@FreeBSD.ORG Thu Apr 28 14:35:44 2005 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DAA4916A4CE; Thu, 28 Apr 2005 14:35:44 +0000 (GMT) Received: from multiplay.co.uk (www1.multiplay.co.uk [212.42.16.7]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1F38143D49; Thu, 28 Apr 2005 14:35:44 +0000 (GMT) (envelope-from killing@multiplay.co.uk) Received: from stevenp4 ([193.123.241.40]) by multiplay.co.uk (multiplay.co.uk [212.42.16.7]) (MDaemon.PRO.v8.0.1.R) with ESMTP id md50001366665.msg; Thu, 28 Apr 2005 15:32:14 +0100 Message-ID: <06ba01c54bff$8c5aed00$7f06000a@int.mediasurface.com> From: "Steven Hartland" To: , Date: Thu, 28 Apr 2005 15:35:39 +0100 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="Windows-1252"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2527 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 X-Spam-Processed: multiplay.co.uk, Thu, 28 Apr 2005 15:32:14 +0100 (not processed: message from valid local sender) X-MDRemoteIP: 193.123.241.40 X-Return-Path: killing@multiplay.co.uk X-MDAV-Processed: multiplay.co.uk, Thu, 28 Apr 2005 15:32:15 +0100 Subject: Re: Very low disk performance Highpoint 1820a X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 28 Apr 2005 14:35:45 -0000 Sorry wanted to send to performance not current :) Steve ----- Original Message ----- > I've just finished putting together a new server box spec: > Dual AMD 244, 2GB ram, 5 * Seagate SATA 400GB on a > Highpoint 1820a RAID 5 array. > The machine is currently running 5.4-STABLE ( from the > weekend ) After install I did some basic tests and the > disk is return very poor performance low in fact than a > single disk on a bog standard ATA 100 controller: > > 5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk ) > dd if=/dev/da0 of=/dev/null bs=64k count=10000 > 10000+0 records in > 10000+0 records out > 655360000 bytes transferred in 13.348032 secs (49097875 bytes/sec) > > 5.3-RELEASE Highpoint 454 RAID 5 ( 4 disk ) > dd if=/dev/da0 of=/dev/null bs=64k count=10000 > 10000+0 records in > 10000+0 records out > 655360000 bytes transferred in 20.410034 secs (32109697 bytes/sec) > > 5.2.1-RELEASE Intel ICH3 UDMA100 ( 1 disk ) > dd if=/dev/ad0 of=/dev/null bs=64k count=10000 > 10000+0 records in > 10000+0 records out > 655360000 bytes transferred in 11.142405 secs (58816745 bytes/sec) > > Obviously something is seriously a miss here somewhere as > both the RAID 5 arrays a producing less throughput than > a single disk. > > Where do I start looking? ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone (023) 8024 3137 or return the E.mail to postmaster@multiplay.co.uk.