基于QOS的磁盘调度策略  

A Disk Scheduling Scheme with QoS Guaranteeing

作　　者：厉励[1] 张宏坡[1] 李海[1] 周兵[1] 

机构地区：[1]郑州大学,郑州450001

出　　处：《计算机科学》2006年第9期118-120,221,共4页Computer Science

基　　金：河南省高校杰出人才创新工程资助;河南省骨干教师项目资助。

摘　　要：随着视频点播、视频会议、视频监控、数字图书馆等流媒体应用的普及,流媒体服务器存储资源管理成为制约服务质量的瓶颈之一。根据多媒体服务器的性能要求,提出了一种支持QoS的磁盘调度策略。它由三个主要部分组成：探测模块、负载监测模块和自适应管理模块。探测模块,负责判断当前的资源情况能否满足服务请求；自适应模块,根据负栽监测模块检测到的负载变化情况,动态调整服务周期在实时请求和尽力服务请求之间的分配。实验表明此磁盘调度策略能在保证实时请求无抖动执行的同时,明显减少了非实时请求的响应时间。With booming of the application of streaming media such as VoD, video conference, video surveillance sys tern, digital library etc, the management of storage resource becomes one of the bottlenecks that restrict the service quality of streaming media server. In this paper a novel disk scheduling scheme of QoS guaranteeing is proposed for media streaming servers in this paper. The scbeme consists of three parts： a request detecting module which determines whether the current resource meets the demand; a workload detecting module which monitors the load change in each application; a disk period manager which uses the workload statistical results to dynamically adjust the period allocation of each application. The scheme gives priority to the Best-Effort disk requests while meeting real time request deadlines. Experiments show this scheme can reduce the mean response time of the Best-Effort requests while guaranteeing the real time requests with little jitters.

关 键 词：多媒体服务器 磁盘调度 实时请求 尽力服务请求 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]