Date: Sun, 08 Nov 1998 00:17:36 -0700 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Greg Lehey <grog@lemis.com> Cc: "Kenneth D. Merry" <ken@plutotech.com>, bill@bilver.magicnet.net, freebsd-fs@FreeBSD.ORG Subject: Re: RAID1 Software vs Hardware Message-ID: <199811080724.AAA03989@pluto.plutotech.com> In-Reply-To: Your message of "Sun, 08 Nov 1998 17:39:20 %2B1030." <19981108173920.N499@freebie.lemis.com>
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>> 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? RAID 3 is ideal when your data requests are always a multiple of the strip size. In our case, we block video and audio data into a convenient and efficient block size for the current drive configuration / output mode (e.g 625/525 CCR601, compressed 1080I or 720P, 625/525 DVCPRO 25/50Mb). We currently can deliver anywhere from 2 uncompressed DTV streams up to 10 DVCPRO 25Mb streams at a time using a full up system (17 data, two parity, one hot spare). >Greg >-- >See complete headers for address, home page and phone numbers >finger grog@lemis.com for PGP public key -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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