多媒体网络文件系统的Cache算法设计与实现  

Research and Implementation of the Cache Algorithm for Multimedia Network File System

作　　者：詹玲[1] 彭海云[2] 万继光[1] 

机构地区：[1]华中科技大学计算机学院信息存储系统教育部重点实验室武汉光电国家实验室,湖北武汉430074 [2]周口师范学院计算机科学系,河南周口466000

出　　处：《小型微型计算机系统》2009年第9期1873-1876,共4页Journal of Chinese Computer Systems

基　　金：国家自然科学基金项目(60603075)资助;国家"九七三"重点基础研究发展计划(2004CB318203)资助

摘　　要：通过分析多媒体文件存储和文件访问的特点,在TCP/IP协议和本地文件系统的基础上,针对多媒体应用设计一种高性能的多媒体网络文件系统MNFS(Multimedia Network File System).MNFS采用目录和文件数据两级Cache组织结构,便于Cache的维护和快速查询;为了提高系统性能,采用顺序优化的Cache预测算法;Cache的替换算法采用常用的LRU(Least Re-cently Used)算法,分别将目录Cache和文件数据Cache组织成不同的LRU链表.在以太网环境下对MNFS性能进行了测试,测试结果表明,MNFS随机读的性能同SMB(Server Message Block Protocol)相接近,而MNFS顺序读的性能要比SMB高10-20%左右.After analyzing the storage and access characteristics of Multimedia file, a kind of high-performance MNFS（ Multimedia Network File System） which is based on TCP/IP protocol and local file system is designed for Multimedia. The MNFS uses two-level Cache structure （ directory and data）, which is convenient for the maintenance and fast search. In order to improve the disk access performance of MNFS, an optimized Cache algorithm has been designed. The replacement algorithm of whole Cache is LRU （Least Recently Used）, while the directory Cache and file data Cache are organized to different LRU chain. The performance of MNFS is tested in the environment of 100M Ethernet, and the test result shows that the performance of random reading of MNFS is close to Server Message Block Protocol （SMB） , but the performance of sequentially reading is probable 10-20% higher than SMB.

关 键 词：网络文件系统 多媒体 缓存 替换算法 

分 类 号：TP303[自动化与计算机技术—计算机系统结构]