当目标系统从源系统接收到最新的脏页面时，转移过程结束。
When the target system receives the last dirty page from the source system, the migration is complete.
SecondSite还发现，压缩脏页面能够将单次VM复制的带宽提高80%。
SecondSite also found that compression of dirty pages could yield as much as an 80% improvement in bandwidth for a single VM replication.
让检查点以如此之高的频率出现，不但可以让必须传输的脏页面的数量降至最低，而且还最大限度地降低网络与存储帧的缓存成本。
Having the checkpoints occur at this high a frequency minimizes the number of dirty pages that must be transferred and also minimizes the buffering cost for network and storage frames.
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