Persistent messages are written to disk and hence, may be recovered if the message broker crashes for some reason.
持久性消息会写入磁盘，因此如果消息代理因为某种原因发生崩溃，则可以恢复这些消息。
Persistent messages are written to disk and are therefore recoverable in the event of a system failure, but are correspondingly slow.
持久化的消息则会把消息写入磁盘，即便系统发生故障也可找回消息，但相应的处理速度较慢。
Persistent preallocation If an application needs to allocate disk space before actually using it, most file systems do so by writing 0s to the not-yet-used disk space.
持久性预分配如果一个应用程序需要在实际使用磁盘空间之前对它进行分配，大部分文件系统都是通过向未使用的磁盘空间写入0来实现分配。
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