From owner-freebsd-current Thu Dec 16 8:48:50 1999 Delivered-To: freebsd-current@freebsd.org Received: from sabre.velocet.net (sabre.velocet.net [198.96.118.66]) by hub.freebsd.org (Postfix) with ESMTP id 6651E14FE2 for ; Thu, 16 Dec 1999 08:48:44 -0800 (PST) (envelope-from dgilbert@trooper.velocet.net) Received: from trooper.velocet.net (trooper.velocet.net [216.126.82.226]) by sabre.velocet.net (Postfix) with ESMTP id 3BF84137FB9; Thu, 16 Dec 1999 11:48:39 -0500 (EST) Received: (from dgilbert@localhost) by trooper.velocet.net (8.9.3/8.9.3) id LAA05572; Thu, 16 Dec 1999 11:48:39 -0500 (EST) (envelope-from dgilbert) From: David Gilbert MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <14425.6118.899093.621159@trooper.velocet.net> Date: Thu, 16 Dec 1999 11:48:38 -0500 (EST) To: Brad Knowles Cc: David Gilbert , freebsd-current@FreeBSD.ORG Subject: Re: AMI MegaRAID datapoint. In-Reply-To: References: <14425.2778.943367.365945@trooper.velocet.net> X-Mailer: VM 6.75 under 20.4 "Emerald" XEmacs Lucid Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG >>>>> "Brad" == Brad Knowles writes: >> This is impressive and subject to the bug that I mentioned in >> -STABLE which still hasn't been found. Brad> Which one is this? It's a really long thread. I'm not going to repeat it here. Basically, under "enough" load, vinum trashes the kernel stack in such a way that debugging is very tough. I have been talking to a number of people about it in -STABLE. I will continue to debug this on the new news server I'm building (before it gets commissioned), but work on this particular server had to halt with the instalation of the MegaRAID. Brad> With luck, in about a month or so, I should be getting a new Brad> server in with 1GB RAM, 450Mhz Pentium III w/ 1MB L2 cache, a Brad> DPT SmartRAID V controller with 256MB ECC cache, and eight Brad> Fujitsu MAE3182LC 7200RPM 18GB drives for RAID-5 configuration Brad> on a single SCSI bus, for our new anonymous ftp server. I got the MegaRAID 1400 because the DPT V drivers weren't available. The MegaRAID should be roughly equivlanet to the DPT V. Do go with LVD if you can. I have done benchmarking with bonnie instead of rawIO. The output is as follows: 1 process, for vinum: -------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 raid-1 512 4554 20.0 4583 6.3 4495 8.3 18596 80.1 30001 25.9 446.0 5.3 1 process, for MegaRAID: -------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 mega 512 7419 32.4 7529 10.2 4653 9.6 14616 63.4 14942 18.8 345.4 5.0 ... now the MegaRAID was at 16.5M/s block read with a different stripe size, but I don't have that output in front of me. Dave. -- ============================================================================ |David Gilbert, Velocet Communications. | Two things can only be | |Mail: dgilbert@velocet.net | equal if and only if they | |http://www.velocet.net/~dgilbert | are precisely opposite. | =========================================================GLO================ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message