From owner-freebsd-stable Tue May 2 3: 1:19 2000 Delivered-To: freebsd-stable@freebsd.org Received: from trinity.skynet.be (trinity.skynet.be [195.238.2.38]) by hub.freebsd.org (Postfix) with ESMTP id 5A4C837BB9A; Tue, 2 May 2000 03:01:11 -0700 (PDT) (envelope-from blk@skynet.be) Received: from [195.238.1.121] (brad.techos.skynet.be [195.238.1.121]) by trinity.skynet.be (Postfix) with ESMTP id A689B180F5; Tue, 2 May 2000 12:00:55 +0200 (MET DST) Mime-Version: 1.0 X-Sender: blk@pop.skynet.be Message-Id: In-Reply-To: <200005020020.RAA04531@mass.cdrom.com> References: <200005020020.RAA04531@mass.cdrom.com> Date: Tue, 2 May 2000 11:28:38 +0200 To: Mike Smith , dg@root.com From: Brad Knowles Subject: Re: How good is AMI MegaRAID support? Cc: freebsd-stable@FreeBSD.ORG Content-Type: text/plain; charset="us-ascii" ; format="flowed" Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG At 5:20 PM -0700 2000/5/1, Mike Smith wrote: > FWIW, most of the low-end PCI:SCSI RAID controllers claim throughput in > the 3-5k IOPs, and 20k is not an uncommon claim for mid-high end > controllers. Simon Shapiro was pushing over 20k on the DPT Century > adapters in "real" applications. I've had a hard time generating more > than 3k or so out of a FreeBSD box's I/O subsystem - we cluster so > aggressively that I typically run out of I/O bandwidth before I hit an > IOP limit. I can't speak for the newer controllers, but you guys know where the pages are that show the results of my previous benchmarks with the DPT SmartRAID IV. I haven't generated and published the summary GIFs, but looking at the rawio tests that I previously ran which most closely compare with the ones I've run more recently (i.e., something that relatively closely simulates what you would see on a news transit server), I don't see anything over 400 random read iops/sec on the SmartRAID IV, and that's the peak value (KBps throughput peaks around 18.5KBps and 282 iops/sec for sequential read, but random read never gets over 7.6KBps at 117 iops/sec). -- These are my opinions -- not to be taken as official Skynet policy ====================================================================== Brad Knowles, || Belgacom Skynet SA/NV Systems Architect, Mail/News/FTP/Proxy Admin || Rue Colonel Bourg, 124 Phone/Fax: +32-2-706.13.11/12.49 || B-1140 Brussels http://www.skynet.be || Belgium To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message