摘要： Replication is the process of sharing information so as to ensure consistency between redundant resources, such as software or hardware components, to improve reliability, fault-tolerance, or accessibility. (wikipedia) 从定义来看, replication技术的目的主要是用于提高分布式系统(distributed object, database, file system等)的可依赖性(dependability), 实现依赖于冗余资源, 需要维护这些资源间的一致性. 按照复制的对象, 可分为data replication与computation replication两种. 按照实现方式, 可分为active replication与passive replication两种. 阅读全文