From owner-freebsd-fs  Sat Nov  7 22:09:50 1998
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From: "Kenneth D. Merry" <ken@plutotech.com>
Message-Id: <199811080608.XAA14179@panzer.plutotech.com>
Subject: Re: RAID1 Software vs Hardware
In-Reply-To: <19981108094916.T499@freebie.lemis.com> from Greg Lehey at "Nov 8, 98 09:49:16 am"
To: grog@lemis.com (Greg Lehey)
Date: Sat, 7 Nov 1998 23:08:30 -0700 (MST)
Cc: bill@bilver.magicnet.net, freebsd-fs@FreeBSD.ORG
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Greg Lehey wrote...
> On Saturday,  7 November 1998 at  8:31:26 -0500, Bill Vermillion wrote:
> > They current have 6 classes - 0 thru 5 - and there is a chart
> > in Adaptec's book on I/O subsytems listing the pro's'/con's of
> > each.  RAID2/3/4 aren't used, and from what I've seen drives that
> > use to have spindle sync for byte/sector striping aren't being made
> > anymore.  But with drives now at 20MB/sec+ speeds, the old needs
> > are gone.
> 
> Correct.  You'd be surprised how many products offer RAID-2/3/4,
> though.  I think the product manager got a checklist to tick off.  I
> have deliberately left these three out of Vinum.

RAID 3 is still used, and is still useful.  All of Pluto's products (see
http://www.plutotech.com) use RAID 3.  It works quite well for video data.

Ken
-- 
Kenneth Merry
ken@plutotech.com

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