[linux-lvm] Data deduplication in LVM?
Les Mikesell
lesmikesell at gmail.com
Thu Jun 11 12:30:27 UTC 2009
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 at gmail.com
More information about the linux-lvm
mailing list