Date: Sat, 10 Nov 2001 14:27:26 -0800 From: Mike Smith <msmith@freebsd.org> To: Greg Lehey <grog@FreeBSD.org> Cc: =?iso-8859-1?Q?S=F8ren_Schmidt?= <sos@freebsd.dk>, john_wilson100@excite.com, freebsd-hackers@FreeBSD.org, sos@FreeBSD.org Subject: Re: HPT370 RAID or Vinum? Message-ID: <200111102227.fAAMRQV01034@mass.dis.org> In-Reply-To: Your message of "Wed, 07 Nov 2001 04:01:35 GMT." <20011107040135.E339@sydney.worldwide.lemis.com>
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> > And why is that ? for RAID's with the same parameters, I'd expect the=
m
> > to perform equal, maybe with a sligtht advantage to the ATA driver si=
nce it
> > saves a few cycles by being tighter integrated.
> =
> 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.
The "algorithms" are in the 'ar' driver, which should really just be a =
vinum shim.
-- =
=2E.. every activity meets with opposition, everyone who acts has his
rivals and unfortunately opponents also. But not because people want
to be opponents, rather because the tasks and relationships force
people to take different points of view. [Dr. Fritz Todt]
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