Performance analysis of video storage server under initial delay bounds

Previous studies on video storage servers focused on improving the disk throughput and reducing the server buffer size. However, the initial delay of a new request, one of the most important quality of service (QoS) parameters from the usersʹ point of view, is almost neglected while designing a storage subsystem or evaluating its performance. For different types of video-on-demand (VOD) services such as interactive video game, digital library, or movie-on-demand system, the initial delay can vary from 0.5 s to 5 min. This criterion brings some impacts on designing a storage server for a particular VOD application. In this paper, we investigate the storage server design and the performance evaluation of VOD systems with different initial delay guarantees. We propose a new performance model on evaluating the efficiency of a video storage server so that a cost-effective configuration can be easily obtained under a specified initial delay bound.