directory caching meaning in Chinese

The goal we must achieve , when designing distributed parallel file system , was analyzed also . the thesis present the logic structure of dpfs , the structure and the flush strategy of the module of directory cache and its role in the read - write operation , duplicate table ' s physical and logical structure , the management and synchronization algorithm of the duplicate table , and the model and the management algorithm of the module of intelligent duplicate management . also the effects that dpfs exerts to the system reliability and the read and write performance compared to ext2 were analyzed
本文首先介绍了数据存储的发展概况与新的需求，分布式文件系统对其发展的重要影响以及设计分布式文件系统需要考虑的各种问题；然后分析了为满足分布式并行服务器的功能需求， dpfs应实现的目标；接着介绍了dpfs设计的总体逻辑结构，目录缓存管理模块的结构设计、刷新策略以及该模块在文件读写重定向中的作用，副本表的逻辑、物理结构、对其缓存的管理和同步算法的实现，以及副本智能管理的设计模型及其管理算法的设计与实现，还分析了dpfs对系统可靠性的影响以及在读写文件时与ext2文件系统性能的比较。