From owner-freebsd-stable Tue May 2 9:43:24 2000 Delivered-To: freebsd-stable@freebsd.org Received: from mass.cdrom.com (adsl-63-202-176-114.dsl.snfc21.pacbell.net [63.202.176.114]) by hub.freebsd.org (Postfix) with ESMTP id 03FBE37B715 for ; Tue, 2 May 2000 09:43:19 -0700 (PDT) (envelope-from msmith@mass.cdrom.com) Received: from mass.cdrom.com (localhost [127.0.0.1]) by mass.cdrom.com (8.9.3/8.9.3) with ESMTP id JAA24520; Tue, 2 May 2000 09:51:34 -0700 (PDT) (envelope-from msmith@mass.cdrom.com) Message-Id: <200005021651.JAA24520@mass.cdrom.com> X-Mailer: exmh version 2.1.1 10/15/1999 To: Brad Knowles Cc: freebsd-stable@FreeBSD.ORG Subject: Re: How good is AMI MegaRAID support? In-reply-to: Your message of "Tue, 02 May 2000 11:28:38 +0200." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 02 May 2000 09:51:34 -0700 From: Mike Smith 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. The SmartRAID IV is not the same animal as the Century; the IV is a very old design and should probably be considered in the same vein as the Mylex DAC960PL and the AMI MegaRAID 418. Functional, but not a performance solution. -- \\ Give a man a fish, and you feed him for a day. \\ Mike Smith \\ Tell him he should learn how to fish himself, \\ msmith@freebsd.org \\ and he'll hate you for a lifetime. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message