Appeal No. 1998-1434 Page 2
Application No. 08/159,647
conventional data transfer (e.g., copying a file, accessing a
spreadsheet) in that it requires a sustained high data rate
rather than a burst of data. Delivery of data is also time
critical; as little as a 0.5 second delay in delivery can
result in the reproduced video breaking up. Full motion video
playback on a plurality of workstations over a network further
complicates data recovery by introducing contention issues.
While redundant arrays of inexpensive disks (RAID)
architectures have successfully met conventional data transfer
demands for increased bandwidth, the application of RAID to
real- time reproduction of independent video segments on a
plurality of processors has been less successful.
Specifically, conventional RAID architectures fail to recover
data quickly enough to meet the real time reproduction
demands.
The inventive RAID architecture services workstations
making independent requests for reproduction of video
segments. Duplicate video segments are stored on each of a
plurality of direct access storage devices (DASDs). In
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