一种维护远程备份系统的优化O2-safe方法  

An Optimized O2-safe Approach to Maintaining Remote Backup Systems

作　　者：张艳[1] 李强[2] 李舟军[3] 何德全[1] 

机构地区：[1]四川大学数学学院,四川成都610064 [2]湖南师范大学数学与计算机科学学院,湖南长沙410081 [3]北京航空航天大学计算机学院,北京100083

出　　处：《四川大学学报（工程科学版）》2006年第2期118-124,共7页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金(9010402660473057);国家"十五"科技攻关计划资助项目(2001BA102A07-04-01)

摘　　要：远程备份系统在发生灾难时提供了系统的连续可用性,是支持灾难备份与恢复的重要技术。为克服现有远程备份系统比较低的事务吞吐量,提出了一种维护远程备份系统的优化O2-safe方法,对两段锁协议进行修改,按事务CSB时间戳的顺序而不是先来先服务的方式对备份系统上的数据加锁,以重建备份系统上事务间的相关性,使得不相关的事务能并发执行。理论证明了它的正确性和有效性。模拟测试结果表明,在保证系统完整性和一致性的前提下,优化O2-safe方法充分挖掘备份系统上事务间的并发执行性,从而大大提高了系统的事务吞吐量。Remote backup systems provide system continuous availability even when disasters hit the primary system and is a significant technique used to support disaster backup and recovery. Existing remote backup systems offer lower transaction throughput. In this study, an optimized O2-safe approach was put forward. This method reconstructs dependency between transactions by inserting lock requests on data based on CSB timestamp rather than FCFS mode at the backup, and so sufficiently exploits parallelism between transactions in the backup system. Its correctness and efficiency were validated both theoretically and experimentally. Experimental results showed that optimized O2-safe has high transaction throughput without risking loss of transactions in case of primary failures.

关 键 词：灾难恢复 数据备份 远程备份 分布式事务处理 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]