Messages in this thread | | | Date | Tue, 26 Feb 2002 11:15:09 -0700 | From | Andreas Dilger <> | Subject | Re: ext3 and undeletion |
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On Feb 26, 2002 10:00 -0800, H. Peter Anvin wrote: > Rose, Billy wrote: > > My company can tolerate 0% loss of data (which is why I raised this issue). > > There is no such thing as 0% loss of data. You can get some amount of > security with backups, snapshots (really useful!) or undelete, but you > can *NEVER* guarantee 0% loss of data... consider the case when a > (l)user overwrites (not just deletes) a newly created file.
Snapshots at the filesystem level could handle the overwrite case.
However, even then it cannot be 0% loss of data, unless you have snapshots for _every_ write of the file, which would quickly become prohibitive in space usage (think autobackup from an editor on a large file). Sometimes people just have to learn from their mistakes...
Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/
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