集群是指物理上连接并紧密集成的两台或多台服务器,目的是提高可用性和可伸缩性。这些服务器不完全相同但十分相似,每台都能独立完成特定的任务。运行一个集群需要特殊的软件、硬件支持。 第37期中介绍了服务的集群的可用性等级,和高可用性集群突破结构中的“主/从方式”、“双名用方式”、“全部复制”方式、“0共享”方式。 Clusters are two or more servers that are physically connected and tightly integrated to increase availability and scalability. These servers are not exactly the same but very similar, each capable of performing specific tasks independently. Running a cluster requires special software and hardware support. The 37th chapter introduced the availability level of the service cluster and the “master / slave mode”, “dual-use mode”, “all-copy” mode, and “0-sharing” mode in the high availability cluster breakout structure.