On Thu, 2005-08-04 at 18:30 +0300, Marc A. Volovic wrote:
> On Thu, 2005-08-04 at 18:15 +0300, Omer Zak wrote:
>
> > They solve it by journalling the changes which were made to the file
> > since the last backup. So if you lose the original file, you can
> > recover it by retrieving the backup and re-applying to it the changes
> > listed in the journal file.
>
> Au contraire!
>
> ReiserFS, ext3, XFS and JFS journal METADATA! What the gentleman is
> looking to journal is the data.
What I mean is the following application design, if the original
questioner has control over it:
Each time the application modifies the data file, it appends, to a
journal file, information, which would allow it to re-do the same
changes to the data file.
This is the same pattern used by ext3 et.al. and by DBMSs, which
maintain a journal of database modifications.
--- Omer
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