This article explores the concepts of redundancy and failover as applied to virtualization environments in addition to the open source offerings for software HA.

除针对软件HA的开源产品之外，本文还探讨了应用于虚拟化环境的冗余与故障恢复的一些概念。

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Terracotta is designed with total HA in mind (n + m redundancy — as many backups as you want, continuous upgrades with no downtime, etc.).

Terracotta设计时就考虑了全面的HA (n + m冗余度——你可以有任意多的备份，不停机的持续升级，等等)。

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With redundancy being the key feature of an ha cluster, the components that are essential in this example are node management, a distributed file system, volume management, and monitoring.

由于冗余是ha集群的关键特性，因而在这个例子中基本的组成部分包括节点管理、分布式文件系统、卷管理和监控。

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