每个节点有其自己的处理器和内存，节点间可以互相通信。
Each node has its own processors and memory; the nodes can talk to each other.
每个额外节点都需要额外的内存来保存集群中每个节点的备份，所以很快就会用光内存。
Each extra session requires extra memory for its backups on every node in the cluster, so you quickly run out of memory.
在这种模式下，写操作是在数据存储到本地磁盘并镜像到对等节点内存后被确认的。
In this mode, the Write operation is acknowledged after the data is stored on the local disk and mirrored to the peer node's memory.
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