> I am asking how to flush the data from these logs to disk. I know of
> several methods:
> 1. open with O_SYNC,
> 2. sync(2),
> 3. fsync,
> 4. fdatasync,
> 5. msync (if they are mmaped).
>
> Which of these are best and most reliable for (a/b) and for (IDE/SCSI)?
For scsi the combination of O_SYNC and ext3 or fsync and ext3 should be
reliable. fdatasync doesn't write back all the metadata so depending on
the use may not be sufficient. FAT based fs's I believe you need a
current kernel for full O_SYNC behaviour.
> What are differences between them?
See the manual pages and/or standard.
> other precautions that I should be aware of? What about write caches? Are
> write barriers implemented (on IDE and SATA/SCSI) or should I turn caches
> off?
SCSI shoule be fine, IDE turn off the write cache.
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