Thank you for the answers. I'm still confused. If fsync is not replicated to the slave, then how is replication affected by a corrupt master? If the master dies and there's a commit recorded in the wal log that didn't actually happen, wouldn't the slave still be expected to be in a sane state, with the wal logs accurately reflecting what's on disk?
Maybe I just don't understand streaming replication enough. The docs seem to say that synchronous commits mean that the slave also has to verify a write before a transaction is considered complete. How does fsync affect the way/order in which statements are sent to the slave for replication?
