From owner-freebsd-hackers Sun Nov 11 3: 6:27 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from sydney.worldwide.lemis.com (dhcp243.rocks.bsdconeurope.org [195.40.100.243]) by hub.freebsd.org (Postfix) with ESMTP id 3282837B405; Sun, 11 Nov 2001 03:06:03 -0800 (PST) Received: (from grog@localhost) by sydney.worldwide.lemis.com (8.11.6/8.9.3) id fABB5iE32153; Sun, 11 Nov 2001 11:05:44 GMT (envelope-from grog) Date: Sun, 11 Nov 2001 11:05:43 +0000 From: Greg Lehey To: =?iso-8859-1?Q?S=F8ren_Schmidt?= Cc: Mike Smith , john_wilson100@excite.com, freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG Subject: Re: HPT370 RAID or Vinum? Message-ID: <20011111110543.F31680@sydney.worldwide.lemis.com> References: <200111102227.fAAMRQV01034@mass.dis.org> <200111110833.fAB8Xun88149@freebsd.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.2.5i In-Reply-To: <200111110833.fAB8Xun88149@freebsd.dk>; from sos@freebsd.dk on Sun, Nov 11, 2001 at 09:33:56AM +0100 Organization: The FreeBSD Project Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-418-838-708 WWW-Home-Page: http://www.FreeBSD.org/ X-PGP-Fingerprint: 6B 7B C3 8C 61 CD 54 AF 13 24 52 F8 6D A4 95 EF Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sunday, 11 November 2001 at 9:33:56 +0100, Søren Schmidt wrote: > It seems Mike Smith wrote: >>> Agreed. I don't think the RAIDs will have the same parameters. Most >>> of these cheap controllers have fairly simplistic algorithms. Note >>> that I said "guess", though. In my language, that means "don't know >>> for sure". I'd really like to see some objective benchmarks. >> >> Er. >> >> These "cheap controllers" don't have any algorithms at all to speak of; >> they're just ATA controllers with BIOS code that supposedly understands >> striping/mirroring. > > There is no algorithm to speak of involved with striping, and just > a little more in mirroring in the error case, but anyways.. Well, there are questions of stripe size and whether you read entire stripes or just the part you want. >> The "algorithms" are in the 'ar' driver, which should really just be a >> vinum shim. > > Well, the way vinum is implemented that wont work unfortunately. Details? Greg -- See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message