To effectively organize the historical data of Continuous Data Protection ( CDP) systems and improve the recovery efficiency in case of the disaster occurrences, this paper presented three different methods for metadata management in CDP systems, which has important impacts on the system recovery performance. The former two (DIR-MySQL and OPT-MySQL) were simple implementations based on MySQL database and the other one ( META-CDP) was designed taking its characteristics into consideration. The experimental results show that the three methods all can increase the recovery efficiency of CDP systems. MySQL based methods will get worst as the amount of recovery data increases, and the META-CDP method is not much sensitive to the increasing amount of recovery data. The META-CDP method is far more efficienl than the other two and its performance is reasonably acceptable.%为有效组织连续数据保护(CDP)的历史数据以提高灾难发生时系统的恢复效率,研究了影响CDP系统恢复性能的元数据管理方法,设计并实现了三种元数据管理方法.其中两种(DIR-MySQL和OPT-MySQL)是简单的基于MySQL数据库的实现,而另一种(META-CDP)是根据应用特点而设计的.实验结果表明,三种管理方法均能够有效提高系统的恢复效率.其中,前两种方式随着恢复数据量的增加,所需要的恢复时间剧增；而后一种方式随着数据量的增加,恢复时间增加很小,其效率比前两种方法高很多,而且其性能也在可接受范围内.
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