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They do if you don't use F_FULLSYNC, even apple acknowledges it (quote apple man pages): > Specifically, if the drive loses power or the OS crashes, the applic
by dathinab 5y ago
They do if you don't use F_FULLSYNC, even apple acknowledges it (quote apple man pages):
> Specifically, if the drive loses power or the OS crashes, the application may find that only some or none of their data was written.
It's also worse then just write losses:
> The disk drive may also re-order the data so that later writes may be present, while earlier writes are not.
- colanderman 5y agoI'm using "acknowledged" in the sense of SCSI-level flush (per the thread OP), not mac OS's peculiar implementation of fsync.
- dathinab 5y agoBut the thread OS is about it not being a problem that SCSI-level flushes are supper slow, which is only not a problem if you don't do them (e.g. only use fsync on Mac)? But reading it again there might have been some confusion about what was meant.
- marcan_42 5y agomacOS does issue an NVMe flush on standard kernel panics, although of course it's possible to have it die in a way where that doesn't work.