From owner-freebsd-fs Sat Nov 7 23:26:29 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id XAA10662 for freebsd-fs-outgoing; Sat, 7 Nov 1998 23:26:29 -0800 (PST) (envelope-from owner-freebsd-fs@FreeBSD.ORG) Received: from pluto.plutotech.com (mail.plutotech.com [206.168.67.137]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id XAA10657 for ; Sat, 7 Nov 1998 23:26:28 -0800 (PST) (envelope-from gibbs@plutotech.com) Received: from narnia.plutotech.com (narnia.plutotech.com [206.168.67.130]) by pluto.plutotech.com (8.8.7/8.8.5) with ESMTP id AAA03989; Sun, 8 Nov 1998 00:24:23 -0700 (MST) Message-Id: <199811080724.AAA03989@pluto.plutotech.com> X-Mailer: exmh version 2.0.2 2/24/98 To: Greg Lehey cc: "Kenneth D. Merry" , bill@bilver.magicnet.net, freebsd-fs@FreeBSD.ORG Subject: Re: RAID1 Software vs Hardware In-reply-to: Your message of "Sun, 08 Nov 1998 17:39:20 +1030." <19981108173920.N499@freebie.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 08 Nov 1998 00:17:36 -0700 From: "Justin T. Gibbs" Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org >> 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