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.
如果从旧主机迁移到新主机的页面数量众多(脏工作集)，则会导致十分明显的延迟。
This results in a noticeable delay as a function of the number of pages (dirty working set) to migrate from the old to new host.
这么做可以限制内存中 “脏”页面的数量，从而进一步减少I/O开销和磁盘碎片。
The reason for this is to limit the amount of dirty pages in memory, which further reduces I/O overhead and disk fragmentation.
注意，一些页面可以指向文件，在这种情况下，如果页面是脏(dirty)的，数据将被冲洗，如果页面是干净的(clean)，直接丢掉。
Note that some pages can refer to files, in which case, the data can be flushed if dirty (through the page cache) or, if the page is clean, simply discarded.
注意，一些页面可以指向文件，在这种情况下，如果页面是脏(dirty)的，数据将被冲洗，如果页面是干净的(clean)，直接丢掉。
Note that some pages can refer to files, in which case, the data can be flushed if dirty (through the page cache) or, if the page is clean, simply discarded.
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