Analyzing cache performance for video servers

Video-on-demand (YOD) is expected to become one of the most important and successful services to be offered on emerging technologies. There is not just an interest in the delivery of digital video for home entertainment purposes, bur there are also several educational and commercial benefits from this service. However for this service to become viable, if is important that the video sewers meet the demanding data rates and real-time performance requirements imposed by video. Interval caching has been proposed as a cost-effective way of improving the throughout of a sewer but all previous studies on interval caching have used simulation With numerous parameters and their complex interplay affecting the performance of interval caching, if is infeasible to consider a full-factorial experiment with simulation. This paper presents an analytical model for interval caching on video servers. The model has been extensively validated over a range of client requests, video data and server parameters. In addition, the model has been generalized to accommodate variable lengths of video data stored at the sewer Using this model, the impact of different parameters has been studied on the performance of interval caching scheme.