With asynchronous replication, order is preserved, but the write is allowed to complete without waiting for an acknowledgement from the target node that the write has been received there.
对于异步复制，顺序是一样的，但是无需等待目标节点确认已经收到写入操作，就可以完成生产节点上的写入操作。
DRBD supports two modes for Write operations called fully synchronous and asynchronous.
DRBD支持两个模式的写操作，即完全同步和完全异步。
The framework doesn't try to isolate synchronous code from asynchronous code in a consistent way, making it dangerously easy to write code that accidentally blocks the entire stage.
框架并没有尝试以一种一致的方式将同步代码从异步代码中分离开来，从而使编写出的代码很容易意外阻塞整个阶段。
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