Synchronizing and Smoothing the Video Streams between Different Hierarchical Storage in VOD Servers

Abstract

ronize and guarantee smooth transitions between different storages in a VOD server while displaying a video stream. So far no paper ever explored deeply the flow control of video streams between different storages in the hierarchical architecture. Here the policies and mathematical models are proposed to manage all levels of storages. A new technique called Dynamic Replacement Policy (DRP) is proposed to manage the disks efficiently, and it guarantees that a granted request can be definitely serviced within each cycle, even if no sufficient spaces are reserved for the granted request in advance. Finally simulation experiments are conducted to evaluate and compare different cases. The results show that 1) DRP is a good policy for managing disks, and 2) although minimizing the size of the tertiary stage section can store more popular video files in the hot video section for servicing more clients at the same time, it will increase the waiting time of the requests.