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A Hierarchical Network
Storage Architecture for Video-on-Demand Services.
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[Abstract]
[Download Postscript file] |
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Yuan-Cheng Lai, Ying-Dar Lin, Horng-Zhu Lai
Proceedings
of IEEE 21st Conference on Local
Computer Networks, October 1996. |
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Recent
advances in Cable TV networks and multimedia technologies open the possibilities for
network/service/content providers to offer residential customers with video-on-demand
services. However, the mass storage system in supporting such services demands proper
organization and management. In this paper we present a three-level hierarchical network
storage architecture for the video-on-demand storage system. At the first-level (Local
Service Center, LSC) a limited number of programs with high viewing probabilities are
stored; while at the second-level (Local Central Service Center, LCSC) a few programs with
second high viewing probabilities are stored. The third-level (Central Service Center,
CSC) contains all programs provided in the system. Based on this architecture and the
program viewing probability distribution function, we use a minimum-cost function to find
out the numbers of programs stored in the two service centers (LSC and LCSC) and numbers
of links among these three service centers. We also describe two program reallocation
algorithms which swap programs between service centers according to the change in user
request patterns. |
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