DRBD supports a variation on each method that provides a bit more data protection than asynchronous at a slight cost in performance.
DRBD支持每种方法的变体，这些方法比异步模式提供更多的数据保护，代价是性能略有下降。
2
Furthermore, there is quite a bit of boilerplate code involved in setting up an asynchronous call.
此外，在建立异步调用时还包括不少样板代码。
3
Remember, we are assuming that the Credit History component takes a bit longer, so we first fire off an asynchronous request to get the History, and retrieve the response at a point later in time.