用于VOD系统的块重组策略及分组调度算法  

Block Rearrangement Policy and Grouped Scheduling Algorithms for VOD System

作　　者：黄建忠[1] 谢长生[1] 傅湘林[1] 方志鹏[1] 

机构地区：[1]华中科技大学计算机学院外存储国家重点实验室,武汉430074

出　　处：《计算机科学》2003年第7期53-55,共3页Computer Science

基　　金：国家自然科学基金(NO.60173043)

摘　　要：With the advances in storage subsystems, compression and network technology, video-on- demand (VOD)is increasingly becoming an important services, the investigation to improve the performance of VOD servers has be-come a major focus. In this paper, we propose two rearrangements of data block and a request scheduling algorithms.With this approach, the data blocks with comparable access frequency are kept closer to each other, so as to reducethe moving distance of disk head and the seeking time. The simulation result demonstrates that the strategy and algo-rithms can effectively reduce disk access time and response latency respectively.With the advances in storage subsystems, compression and network technology, video-on- demand (VOD) is increasingly becoming an important services, the investigation to improve the performance of VOD servers has become a major focus. In this paper, we propose two rearrangements of data block and a request scheduling algorithms. With this approach, the data blocks with comparable access frequency are kept closer to each other, so as to reduce the moving distance of disk head and the seeking time. The simulation result demonstrates that the strategy and algorithms can effectively reduce disk access time and response latency respectively.

关 键 词：块重组策略 分组调度算法 VOD系统 视频点播系统 租赁模式 视频服务器 

分 类 号：TN948.64[电子电信—信号与信息处理]