基于移动Agent的新型分布式文件系统研究  

The Research of Mobile Agent-based Distributed File System

作　　者：卢军[1] 卢显良[1] 韩宏[1] 许腾[1] 

机构地区：[1]电子科技大学计算机学院,成都610054

出　　处：《计算机科学》2002年第10期42-45,48,共5页Computer Science

基　　金：国家95重点攻关项目支持

摘　　要：1.引言 现代分布式文件系统的发展趋势[1]是Transparency、Scalability、UnixSemantics、Reliability、Adaptation和Security.随着技术的发展,人们希望建立一种分布式文件系统来管理更广范围的文件资源,例如管理WAN环境中的文件资源,甚至管理Web环境中的文件资源.传统分布式文件系统大多是针对高带宽、低时延的LAN设计的,不能适应低带宽、高时延的WAN环境[1],主要体现在:(1)文件存储协议、Cache 管理机制不适合WAN.传统分布式文件系统的文件传输协议、Cache管理机制是针对高带宽、低时延的LAN设计的,在低带宽、高时延的WAN下性能很差.In general,conventional distributed file systems is designed for LAN environment. They always play worse performance in WAN than in LAN. In this paper we present a new distributed file system-The Mobile Agent-based File System (MADFS). The intent of MADFS is to minimize the latency overhead inherent to the distribution of a large file system in WAN. MADFS organizes hosts into a hierarchical structure, uses Mobile Agents as the underlying transfer, communication and synchronization mechanism and uses hierarchical-and-converge cache coherency protocol to minimize network usage. MADFS can achieve better performance and availability than conventional distributed file system in WAN. In this paper, the architecture of MADFS, performance analysis, cache coherency protocol and security are discussed. At last of this paper, the disadvantage and future work of MADFS are presented.

关 键 词：分布式文件系统 文件资源 局域网 广域网 计算机网络 文件传输协议 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]