Roy Sigurd Karlsbakk wrote:
Roy Sigurd Karlsbakk wrote:
Hi all
I've been reading up a little about data deduplication, and have been
in search for an OSS filesystem with dedup without much luck. While
testing snapshots and so on in LVM, I started wondering if dedup
would be better off in LVM than in the filesystem. Would it be
possible/efficient to add dedup to the LVM layer, or perhaps a layer
above LVM? This could make dedup work for all or most of filesystems.
Make a hash table with 4k (or whatever) blocks, make virtual blocks
pointing to the physical blocks and run a remapping/deduping job at
night. If written to, copy-on-write could be used to increase speed.
Is this nonsense, or might it be an idea?
This is "supposed" to be coming in the next OpenSolaris/ZFS release
(per the roadmap with the just-released 2009.06 version).
What about Linux/LVM? Or did I misunderstand you?
I thought the question was about OSS... I wouldn't hold my breath
waiting for a Linux/LVM version - and for that matter I'll believe the
ZFS release when I see it, but at least it is being planned and could be
less than a year away.
--
Les Mikesell
lesmikesell@gmail.com
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