On Wed, 1 Aug 2001, Jay R. Ashworth wrote:
> But you see, if the sales pitch is "journalling is worth the speed hit
> because it protects your *data*", then they're lying. It only protects
> your file system structures.
Those aren't data? Corrupt metadata is potentially worse than losing files
- you can easily lose whole directories. It is still a huge improvement
in reliability over nonjournalled filesystems.
There are severally levels of journalling, by the way, from metadata only
to full data journalling. The latter (which ext3 optionally supports)
ensures that the disk is entirely consistent each time the journal is
committed. While not perfect, it's pretty darn good. Combine with an
external non-volatile RAM for a journalling device and you've got pretty
damn high reliability.
--
"Love the dolphins," she advised him. "Write by W.A.S.T.E.."
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