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[linux-lvm] Data deduplication in LVM?



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?

roy
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Roy Sigurd Karlsbakk
(+47) 97542685
roy karlsbakk net
http://blogg.karlsbakk.net/
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I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.



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