Abstract

In this paper, we evaluate three storage systems for movieson -demand video servers. We show that striped disk farms, in which portions of movies are interleaved among disks, perform best. They achieve close to full disk utilization, good load balancing, and the lowest cost per video stream. Disk farms that store one movie per disk have lower performance, since disks holding less popular movies are under-utilized; however, these systems achieve relatively good performance by replicating movies according to their popularity in the request pattern. Finally, we evaluate the use of storage hierarchies to support movies-on-demand video service. We show that their performance is so poor that their effective cost per video stream is two orders of magnitude higher than that of magnetic disk systems. We conclude that for the foreseeable future, most video servers will store movies entirely on disk. INTRODUCTION This paper explores storage system alternatives for movieson -demand video servers...

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