摘要
块级连续数据保护技术能够提供任意时刻的数据恢复,构建可靠数据存储环境,已成为现代存储系统重要的数据保护手段。数据的高可用性对数据恢复效率提出了更高的要求,针对传统块级连续数据保护机制数据恢复效率低的问题,结合数据块级写请求的集中分布特性和连续分布特性,提出了一种块级连续数据保护数据恢复机制——RM-LCDF。RM-LCDF采用去除无效写请求、多缓冲和逻辑块地址排序3种优化策略,对数据恢复过程进行优化。形式化分析及实验结果表明,RM-LCDF能够大幅度减少恢复过程中的I/O数据量,提高I/O并发度及写I/O吞吐率,进而有效提高恢复效率。
Block-level continuous data protection has become an important data protection technology for modem data storage systems. It can restore data to any point in time and support reliable storage. The high availability of computeri- zed data has a raise requirement on the data recovery efficiency, but basic data recovery method for block-level continuous data protection is low. This paper presented a recovery method on the basis of the localized and continuous distribution features （RM-LCDF） for block-level continuous data protection. RM-LCDF reforms the basic data recovery method via three aspects： （1） Invalid write requests elimination, （2） Multi-buffer, and （3） Logical block address sorting. Both mathe- matical analysis and experiments show preliminarily that RM-LCDF can significantly reduce recovery data, improve I/O parallelism and I/O throughput,and thus improve the recovery efficiency.
出处
《计算机科学》
CSCD
北大核心
2013年第6期172-177,共6页
Computer Science
基金
国家重点基础研究发展计划(973计划)课题(2012CB316203)
国家自然科学基金(6103 3007/F020204)资助
关键词
连续数据保护
数据恢复
块数据
可用性
存储系统
Continuous data protection （CDP）, Data recovery, Block-level data, Availability, Storage system
