面向分布式文件系统的可扩展快照技术  

Scalable Snapshot for Distributed File System

作　　者：刘雅琪[1,2] 邢晶[1] 霍志刚[1] 孙凝晖[1] 

机构地区：[1]中国科学院计算技术研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《高性能计算技术》2013年第6期17-21,共5页

基　　金：本文获得国家“973”计划项目基金（2012CB316502）和国家“863”计划项目基金（2013AA01A211）资助.

摘　　要：摘要快照技术作为保障存储系统数据安全性的重要手段已得到越来越多的应用。然而在面向海量数据的分布式文件系统中，快照技术在快照记录和快照恢复方面存在开销高、扩展性差等问题。为此本文提出了一种面向分布式文件系统的可扩展快照技术，该方法通过基于日志的快照一致性算法和基于目录树的增量快照恢复算法实现了可扩展的快照记录和快照恢复。通过与现有快照进行比较，本文从理论分析角度证明了该方法能够在快照记录和快照恢复过程中有效降低快照开销，实现可扩展的分布式文件系统快照。As a significant means to ensure the data security of storage system, snapshot has been widely used. However, in the distributed file system for massive data, it imposes high overhead and bad scalability whenever recording or restoring snapshot. For this reason, we proposed a method of scalable snapshot for distributed file system, which implement snapshot recording through log-based snapshot consistency algorithm and snapshot restoring through tree-based restoration algorithm for incremental snapshot. By comparing with existing snapshot technology, we theoretically demonstrated that our method are effective in reducing overhead when record or restore snapshot, and realized a scalable snapshot for distributed file system.

关 键 词：分布式文件系统 快照开销 快照一致性 快照恢复 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]