验证同步和异步服务调用正在将调用确认消息记录到控制台输出，如图19所示。
Verify that synchronous and asynchronous service calls are logging invocation confirmation messages to console output, as shown in Figure 19.
在同步模式下，只有接收到来自hdr备用服务器的确认，主服务器才会提交事务。
In synchronous mode, transactions on the primary server will not commit until it receives an acknowledgement from the HDR secondary server.
此确认消息是同步发送的；也就是说，不需要对消息进行响应，只需将消息排队等待主系统进行处理。
This confirmation message is sent asynchronously; that is, no response to the message is required and the message is simply queued to the main system for processing.
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