From owner-freebsd-stable Tue Oct 17 15: 7:37 2000 Delivered-To: freebsd-stable@freebsd.org Received: from mass.osd.bsdi.com (termroom.bsdcon.org [206.55.247.2]) by hub.freebsd.org (Postfix) with ESMTP id 864D537B4F9 for ; Tue, 17 Oct 2000 15:07:34 -0700 (PDT) Received: from mass.osd.bsdi.com (localhost [127.0.0.1]) by mass.osd.bsdi.com (8.11.0/8.9.3) with ESMTP id e9HMAUh00566; Tue, 17 Oct 2000 15:10:30 -0700 (PDT) (envelope-from msmith@mass.osd.bsdi.com) Message-Id: <200010172210.e9HMAUh00566@mass.osd.bsdi.com> X-Mailer: exmh version 2.1.1 10/15/1999 To: Gerhard Sittig Cc: freebsd-stable@FreeBSD.ORG Subject: Re: PERC2 RAID support in 4.1-STABLE In-reply-to: Your message of "Tue, 17 Oct 2000 20:03:18 +0200." <20001017200318.E25237@speedy.gsinet> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 17 Oct 2000 15:10:30 -0700 From: Mike Smith Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > > Its a shorter PCI card than the others, single channel, SCSI > > LVD. It has OK performance. I am currently using it in a > > RAID0+1 type config. > > Where can I learn more about the pitfalls? I have a model 466 > waiting to get employed (RAID5 config with three IBM drives) and > get very poor throughput in the 3MB/s range. I'm aware of the > expensive directory manipulations but even "dd if=/dev/zero > of=$FILE bs=8388608 count=..." is this slow and I don't know > where to start searching. This has been with 4.0-R and 4.1-R, > cvsup to -STABLE has just finished and results will be available > soon. The IBM drives I have play very poorly in RAID configurations. Having said that, you will want to enable write caching on both the drives and the controller for best performance. You'll also want to use the "DirectIO" option on the array. -- ... every activity meets with opposition, everyone who acts has his rivals and unfortunately opponents also. But not because people want to be opponents, rather because the tasks and relationships force people to take different points of view. [Dr. Fritz Todt] V I C T O R Y N O T V E N G E A N C E To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message