From owner-freebsd-questions Tue Mar 11 7:36:28 2003 Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 034EB37B401 for ; Tue, 11 Mar 2003 07:36:27 -0800 (PST) Received: from pop016.verizon.net (pop016pub.verizon.net [206.46.170.173]) by mx1.FreeBSD.org (Postfix) with ESMTP id 22F5143F3F for ; Tue, 11 Mar 2003 07:36:26 -0800 (PST) (envelope-from cswiger@mac.com) Received: from mac.com ([129.44.42.236]) by pop016.verizon.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030311153625.RHL8278.pop016.verizon.net@mac.com> for ; Tue, 11 Mar 2003 09:36:25 -0600 Message-ID: <3E6E0275.2020408@mac.com> Date: Tue, 11 Mar 2003 10:36:21 -0500 From: Chuck Swiger Organization: The Courts of Chaos User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3b) Gecko/20030210 X-Accept-Language: en-us, en MIME-Version: 1.0 To: freebsd Questions Subject: Re: Difference between Vinum and atacontrol RAID? References: <20030309233502.GC1899@bubba.toscano.org> <3E6BE734.4040804@mac.com> <20030311032738.GB1912@bubba.toscano.org> In-Reply-To: <20030311032738.GB1912@bubba.toscano.org> X-Enigmail-Version: 0.73.1.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Authentication-Info: Submitted using SMTP AUTH at pop016.verizon.net from [129.44.42.236] at Tue, 11 Mar 2003 09:36:25 -0600 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Pete wrote: [ ... ] > The RAID-1 volume I'm using right now is with two drives attached to > a non-RAID card with a Promise chipset. Does it work if you move the two drives to another machine without a Promise, Highpoint, or other RAID controller card or MB chipset...? >> Hardware based RAID is likely to be faster, particularly in the case >> of parity calculations for RAID-5. (Not that many IDE controllers can >> do RAID-5, but...) > > It would be, but the RAID on the Promise and Highpoint devices is not > true hardware RAID. It's just software RAID with the drivers moved over > to an EPROM on the card. When you write to a RAID-1 mirror on such a device, does the CPU and PCI bus see two copies of the data? Or does the Promise or HPT deal with distributing the data across the right devices itself? > I know from my own experience and that of > other people that the Linux software RAID outperforms the "hardware" > RAID of these devices. I'm willing to bet that the FreeBSD RAID at > least comes close, if not betters the Linux performance. Software-based RAID can do fine for things like -0 & -1; but without numbers, subjective discussion of performance can be misleading.... -Chuck To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message