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"madog" <no@no.no> wrote in message news:9rg5d5$adj$1@mail.cn99.com...
> > Speed:
> Despite writing some data more than once, ext3 is often faster (higher
> throughput) than ext2 because ext3's journaling optimizes hard drive head
> motion. You can choose from three journaling modes to optimize speed,
> optionally choosing to trade off some data integrity. One mode,
> data=writeback, limits the data integrity guarantees, allowing old data to
> show up in files after a crash, for a potential increase in speed under
some
> circumstances. This mode, which is the default journaling mode for most
> journaling file systems, essentially provides the more limited data
> integrity guarantees of the ext2 file system and merely avoids the long
file
> system check at boot time. The second mode, data=ordered (the default
mode),
> guarantees that the data is consistent with the file system:
> recently-written files will never show up with garbage contents after a
> crash. The last mode, data=journal, requires a larger journal for
reasonable
> speed in most cases and therefore takes longer to recover in case of
unclean
> shutdown, but is sometimes faster for certain database operations, NFS,
and
> synchronous MTA (mail server) operations. The default mode is recommended
> for all general-purpose computing needs.