From owner-freebsd-current Thu Feb 17 8:45:54 2000 Delivered-To: freebsd-current@freebsd.org Received: from vinyl.sentex.ca (vinyl.sentex.ca [209.112.4.14]) by hub.freebsd.org (Postfix) with ESMTP id 25B0137B733; Thu, 17 Feb 2000 08:45:45 -0800 (PST) (envelope-from mike@sentex.ca) Received: from simoeon (simeon.sentex.ca [209.112.4.47]) by vinyl.sentex.ca (8.9.3/8.9.3) with SMTP id LAA06277; Thu, 17 Feb 2000 11:45:44 -0500 (EST) (envelope-from mike@sentex.ca) Message-Id: <3.0.5.32.20000217114319.01bd76a0@marble.sentex.ca> X-Sender: mdtpop@marble.sentex.ca X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.5 (32) Date: Thu, 17 Feb 2000 11:43:19 -0500 To: current@freebsd.org From: Mike Tancsa Subject: MegaRAID 428 vs 466 and a way to wedge the controller Cc: msmith@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG OK, I seem to have my 466 (aka Perc 2/SC) working somewhat as expected once I flashed to BIOS to the latest rev from AMI. However, I can now more reliably wedge the controller where as with the 428 this would only happen on occasion. I have a 466 with a RAID5 set on 3 quantum LVD drives. If I do 4 copies of bonnie -s 600 -d /mnt & the controller seems to wedge on a fairly regular basis, where as this only happened to me once with the 428. As for performance, I do see good performance on random reads, but not so great performance on raw io. e.g. -------Sequential Output-------- ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU amrd0 500 5451 22.7 5275 6.5 4756 6.8 12879 80.6 28521 20.9 840.0 6.1 ad0 500 17559 72.3 18083 22.8 5060 9.6 15293 96.2 14258 15.3 426.4 4.0 ad0: 13072MB [26559/16/63] at ata0-master using UDMA33 This is with a 64K stripe. I imagine a 128K stripe will drop the random seeks, but improve the throughput ? Eventually, this will be a pop3 server so I am not quite sure yet how best to optimze for that. ---Mike ------------------------------------------------------------------------ Mike Tancsa, tel +1 519 651 3400 Network Administrator, mike@sentex.net Sentex Communications www.sentex.net Cambridge, Ontario Canada To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message