NILFS creates a number of checkpoints every few seconds or per synchronous write basis (unless there is no change).

NILFS每隔数秒或每次同步写操作时创建若干个检查点。

youdao

Unless the redo log buffer is particularly full, only one synchronous writes is required per transaction. if piggybacking occurs, there can be less than one synchronous write per transaction.

除非重做日志缓冲区特别满，否则每个事务处理只需要一个同步写入。

youdao

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。

youdao