The backup or shadow server is a continuous checkpoint of the active server, which is implemented through two primary changes to the traditional process of live migration.
备用或影子服务器是活动服务器的一个连续检查点，它通过对传统动态迁移过程进行两处主要改动来实现。
When this command is issued, it waits for checkpoint request from primary.
当发出该命令时，将等待来自主要服务器的检查点请求。
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