As far as zfs performance is concerned, O_DSYNC and O_SYNC are equivalent.
This is because, zfs saves all posix layer transactions (eg WRITE,
SETATTR, RENAME...) in the log. So both meta data and data is always
re-created if a replay is needed.
Anton B. Rang wrote On 10/12/06 15:42,:
fsync() should theoretically be better because O_SYNC requires that each
write() include writing not only the data but also the inode and all indirect
blocks back to the disk.
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