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Issue No. 05 - May (2001 vol. 34)
ISSN: 0018-9162
pp: 64-70
<p>The author proposes a design for an efficient video-on-demand system that uses a practical, technologically sophisticated model to serve the home movie-viewing needs of a wide audience, including meeting peak demand for popular, newly released films. </p> <p>In this VoD model, each customer's VoD terminal connects to a television set and the network. Using the network, the customer contacts the VoD provider to request a movie at a specific time. The movie plays without interruption unless the user decides to pause it. The VoD network's bandwidth permits data transfer at a rate equal to or exceeding the rate at which the TV consumes the data. The terminal buffer's large capacity permits uninterrupted movie playing. </p> <p>The system includes the scheduling algorithm, buffer policy, file-storage lay-out, and a feedback mechanism for denying new requests when the system becomes nearly saturated. OEID--one-way elevator with interleaving and delayed start--includes a one-way elevator algorithm for each disk for each round and provides double buffering for each video stream. </p> <p>Other features include interleaved movie file storage and transmission of a warning message when the terminal nears starvation. Interleaving with delayed start offers the optimal strategy for storing movie files on disks because it permits maximum overlap of the read operations--seek, latency, and transfer-- over all disks, whereas striping overlaps only the transfer component. Also, OEID permits an almost perfectly balanced workload over all disks, on every round, regardless of movie popularity. </p>

W. E. Wright, "An Efficient Video-on-Demand Model," in Computer, vol. 34, no. , pp. 64-70, 2001.
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