Date: Sun, 8 Nov 1998 17:39:20 +1030 From: Greg Lehey <grog@lemis.com> To: "Kenneth D. Merry" <ken@plutotech.com> Cc: bill@bilver.magicnet.net, freebsd-fs@FreeBSD.ORG Subject: Re: RAID1 Software vs Hardware Message-ID: <19981108173920.N499@freebie.lemis.com> In-Reply-To: <199811080608.XAA14179@panzer.plutotech.com>; from Kenneth D. Merry on Sat, Nov 07, 1998 at 11:08:30PM -0700 References: <19981108094916.T499@freebie.lemis.com> <199811080608.XAA14179@panzer.plutotech.com>
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On Saturday, 7 November 1998 at 23:08:30 -0700, Kenneth D. Merry wrote: > 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. I suppose it gives you good throughput. But how do you handle the I/O load? Are you effectively delivering a single video stream? Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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