> Проспись, есть там журналирование. ZILЕсть, то есть, только вот используется оно:
ZIL (ZFS Intent Log)
While ZFS provides always-consistent data on disk, it follows traditional filesystem semantics where the majority of data is not written to disk immediately; otherwise performance would be pathologically slow. But there are applications that require more stringent semantics where the data is guaranteed to be on disk by the time the read(2) or write(2) call returns. For those applications requiring this behavior (specified with O_DSYNC), the ZIL provides the necessary semantics using an efficient per-dataset transaction log that can be replayed in event of a crash.