Sun Jin Oh, Kyung Sook Lee, Ihn Han Bae

The KIPS Transactions:PartB , Vol. 8, No. 5, pp. 523-532, Oct. 2001
10.3745/KIPSTB.2001.8.5.523,   PDF Download:

Abstract

A critical issue in the performance of a video-on-demand system is the required I/O bandwidth of the video server in order to satisfy clients' requests, and it is the crucial resource that may cause delay increasingly. Several approaches such as batching and piggybacking are used to reduce the I/O demand on the video server through sharing. Batching approach is to make single I/O request for storage server by grouping the requests for the same object. Piggybacking is the policy for altering display rates of requests in progress for the same object in order to merge their corresponding I/O streams into a single stream, and serve it as a group of merged requests. In this paper, we propose a reservation-based hybrid disk bandwidth reduction policy that dynamically reserves the I/O stream capacity of a video server for popular videos according to the loads of video server in order to schedule the requests for popular videos immediately. The performance of the proposed policy is evaluated through simulations, and is compared with that of batching and piggybacking. As a result, we know that the reservation-based hybrid disk bandwidth reduction policy provides better probability of service, average waiting time and percentage of saving in frames than batching and piggybacking policy.

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