[linux-lvm] Data deduplication in LVM?

[Roy Sigurd Karlsbakk]

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
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roy at karlsbakk.net
http://blogg.karlsbakk.net/
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