From owner-freebsd-questions Thu Apr 18 02:21:54 1996 Return-Path: owner-questions Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id CAA25116 for questions-outgoing; Thu, 18 Apr 1996 02:21:54 -0700 (PDT) Received: from shell.aros.net (shell.aros.net [205.164.111.19]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id CAA25110 Thu, 18 Apr 1996 02:21:51 -0700 (PDT) Received: (from angio@localhost) by shell.aros.net (8.7.5/Unknown) id DAA17482; Thu, 18 Apr 1996 03:21:50 -0600 (MDT) From: Dave Andersen Message-Id: <199604180921.DAA17482@shell.aros.net> Subject: Re: SCSI RAID controller support? To: angio@aros.net (Dave Andersen) Date: Thu, 18 Apr 1996 03:21:50 -0600 (MDT) Cc: freebsd-questions@FreeBSD.org, gpalmer@FreeBSD.org, thekind@NETural.com In-Reply-To: <199604180543.XAA15760@shell.aros.net> from Dave Andersen at "Apr 17, 96 11:43:24 pm" X-Mailer: ELM [version 2.4ME+ PL13 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-questions@FreeBSD.org X-Loop: FreeBSD.org Precedence: bulk Lo and behold, Dave Andersen once said: > Quite obviously, RAID 0 and RAID 3 have the potential to be > considerably faster than an ordinary disk. I don't know how they compare > to software striping as in the ccd, I don't think anyone's done any > comparisons.:) I've used some of these in graphic design applications, > and they *really* fly. A RAID level 0 array like the FWB Jackhammer is a > very pretty piece of equipment, though a tad expensive for most people. :) As a bit of a followup to this before Terry gets the chance to jump on me: The RAID level 3 disks perform very well in situations where they need high stustainable data transfer rates. The seek times, because of the parity checking, aren't as spectacular as level 0 or as something like software striping (ccd). In a heavy seeking environment with multiple users, RAID level 0 will still show performance bonuses, level 3 less so. -Dave Andersen -- angio@aros.net Complete virtual hosting and business-oriented system administration Internet services. (WWW, FTP, email) http://www.aros.net/ http://www.aros.net/about/virtual "There are only two industries that refer to thier customers as 'users'."