发生裂脑之后，同步存储最简单的方法是在链接出现故障时其中一个节点没有发现改变。
The simplest approach to synchronizing storage after split-brain is when one node saw no changes occur while the link was down.
这允许存储节点复制数据(当发现一个设备出现故障时)。
This allows the storage nodes to replicate data (when a device is found to have failed).
为了优化机器的使用并维护HA，我们在每个站点设计了一个4节点集群：一个节点对应一个应用程序，剩下的一个节点充当故障转移节点。
To optimize the use of machines and to maintain ha, we designed for a four-node cluster at each site: one node per application and a spare node that will serve as the failover node.
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