From owner-freebsd-isp Wed Jul 18 12: 1:41 2001 Delivered-To: freebsd-isp@freebsd.org Received: from nlaredo.globalpc.net (nld2.globalpc.net [207.193.206.189]) by hub.freebsd.org (Postfix) with ESMTP id 07FD437B409 for ; Wed, 18 Jul 2001 12:01:37 -0700 (PDT) (envelope-from adrianbsd@globalpc.net) Received: from ds9 (ds9.globalpc.net [207.193.204.57]) by nlaredo.globalpc.net (8.9.3/8.9.3) with SMTP id OAA99450 for ; Wed, 18 Jul 2001 14:06:18 -0500 (CDT) (envelope-from adrianbsd@globalpc.net) Message-Id: <3.0.6.32.20010718140004.01057240@globalpc.net> X-Sender: adrianbsd@globalpc.net (Unverified) X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32) Date: Wed, 18 Jul 2001 14:00:04 -0500 To: freebsd-isp@FreeBSD.ORG From: Adrian Gonzalez Subject: Adaptec 2100S RAID Performance Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Hello everyone Sorry if this is slightly off topic, but I couldn't find anything similar on the archives. Here goes... I recently got an Adaptec 2100S single channel RAID controller (Ultra 160) and 4 Seagate Cheetah 18G 15K RPM drives. Basically, I mounted the 4 drives in a very nice but somewhat pricey enclosure from Storcase (http://www.storcase.com) and connected the array to the Adaptec card using a 3 ft Ultra-160 cable. The array was configured as RAID 1+0 (two pairs of two-drive RAID1 arrays) to get the best performance. FreeBSD 4.3 happily detected the controller and the disk array. I created a single partition and mounted it under /raid. Now for the question: What kind of performance should I expect from the array? I did simple tests like: dd if=/dev/zero of=test.file bs=1024k count=1000 and wasn't terribly impressed with the performance. dd reported about 44Meg/sec reads and 18Meg/sec writes on average. I know this isn't a terribly reliable way to test the performance, and I'm hoping the advantages of using RAID will show themselves once this array is in a production server under a multiuser environment, but I can't help feeling it's somewhat on the slow side. Anyone have a similar setup or some suggestions for better ways to benchmark this array? Since this is somewhat off-topic, please reply directly to me. I will post any interesting results/observations to the list. Thank you -Adrian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message