Roy Sigurd Karlsbakk wrote:
On 11. juni. 2009, at 00.30, Stuart D. Gathman wrote:
One OSS backup product that does
deduplication is BackupPC (written in Perl). In the backup server,
every file
gets hard linked to a name in a special directory that is its md5
checksum
(plus some fiddly logic to handle metadata)
This sounds like file-level deduplication. Most storage systems sing
dedup, uses block-level dedup. NetApp is one example; they dedup
everything with 4k blocks, doing the actual deduplication at night.
Yes, it is a different concept. However it does work very well when you
are storing your backups on a filesystem without block-level dedup. And
that is probably the place where you have the most redundancy - or if
you don't already, you'll be able to store a much longer history.
--
Les Mikesell
lesmikesell@gmail.com
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