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。
The below diagram represents primary and HDR secondary nodes, and steps of working log staging during checkpoint.
下图展示了主要服务器与HDR次要节点，以及日志暂存在检查点期间的工作步骤。
Once a checkpoint is transferred to the RSS node, it will start staging the log records coming from the primary in a log staging area at RS secondary server.
一旦将检查点传输给rss节点，它会开始将来自主要服务器的日志记录暂存到RS次要服务器上的日志暂存区域中。
This means a checkpoint at the primary server completes only after the checkpoint at the SD server completes.
这意味着只有在SD服务器中的检查点完成后，主服务器中的检查点才能完成。
This means a checkpoint at the primary server completes only after the checkpoint at the SD server completes.
这意味着只有在SD服务器中的检查点完成后，主服务器中的检查点才能完成。
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