From owner-freebsd-current Sat Jan 31 12:46:07 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA02941 for current-outgoing; Sat, 31 Jan 1998 12:46:07 -0800 (PST) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from Kitten.mcs.com (Kitten.mcs.com [192.160.127.90]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id MAA02936 for ; Sat, 31 Jan 1998 12:46:05 -0800 (PST) (envelope-from karl@Mars.mcs.net) Received: from Mars.mcs.net (karl@Mars.mcs.net [192.160.127.85]) by Kitten.mcs.com (8.8.7/8.8.2) with ESMTP id OAA00543; Sat, 31 Jan 1998 14:46:04 -0600 (CST) Received: (from karl@localhost) by Mars.mcs.net (8.8.7/8.8.2) id OAA17605; Sat, 31 Jan 1998 14:46:04 -0600 (CST) Message-ID: <19980131144604.03410@mcs.net> Date: Sat, 31 Jan 1998 14:46:04 -0600 From: Karl Denninger To: Brian Tao Cc: current@FreeBSD.ORG Subject: Re: RAID controllers - folks, check this thing out References: <19980130233604.57426@mcs.net> <19980131143250.22533@mcs.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.84 In-Reply-To: <19980131143250.22533@mcs.net>; from Karl Denninger on Sat, Jan 31, 1998 at 02:32:50PM -0600 Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG X-To-Unsubscribe: mail to majordomo@FreeBSD.org "unsubscribe current" On Sat, Jan 31, 1998 at 02:32:50PM -0600, Karl Denninger wrote: > On Sat, Jan 31, 1998 at 03:17:52PM -0500, Brian Tao wrote: > > On Fri, 30 Jan 1998, Karl Denninger wrote: > > > > > > Talk to Pacific Computer Expansions, a gentleman by the name of > > > Warren at 800-458-5058. > > > > > > You want the CRD-5440. > > > > This is the CMD product (http://www.cmd.com/), isn't it? I had > > one of these from Open Storage Solutions (it's their "Infinity RAID" > > product) on a FreeBSD box in 1996. If you search for the string "CMD > > and RAIDION" in the freebsd-scsi archives, you'll find some of my > > benchmark reports on the CRD-5500. > > -- > > Brian Tao (BT300, taob@netcom.ca) > > "Though this be madness, yet there is method in't" > > > > CMD makes several products. This is their newest architecture. CCD mounted async is NOT a fair comparison - not at all. CCD mounted *normal* might be close to a fair comparison. Also, RAID 5 with other than 5 disks is sub-optimal, and some of those tests were run with fewer drives. I've discovered that the CMD controller here has switched three of the five disks down one notch to 10/20Mbps transfers (from 20/40). It is not completely happy with the cable arrangement, obviously. I will fix that Monday and see what that does for performance. As a result, my tests so far are running with half the disks at only half of the proper transfer rate! -- -- Karl Denninger (karl@MCS.Net)| MCSNet - Serving Chicagoland and Wisconsin http://www.mcs.net/ | T1's from $600 monthly to FULL DS-3 Service | NEW! K56Flex support on ALL modems Voice: [+1 312 803-MCS1 x219]| EXCLUSIVE NEW FEATURE ON ALL PERSONAL ACCOUNTS Fax: [+1 312 803-4929] | *SPAMBLOCK* Technology now included at no cost