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).
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