Date: Sun, 11 Nov 2001 11:05:43 +0000 From: Greg Lehey <grog@FreeBSD.ORG> To: =?iso-8859-1?Q?S=F8ren_Schmidt?= <sos@freebsd.dk> Cc: Mike Smith <msmith@FreeBSD.ORG>, 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> In-Reply-To: <200111110833.fAB8Xun88149@freebsd.dk>; from sos@freebsd.dk on Sun, Nov 11, 2001 at 09:33:56AM %2B0100 References: <200111102227.fAAMRQV01034@mass.dis.org> <200111110833.fAB8Xun88149@freebsd.dk>
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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
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