fredag 03 september 2010 01:42:32 skrev  Davina Treiber:
> On 09/02/10 09:19, Mats Atari wrote:
> > Hello NetWorker list.
> > 
> > I am keen on your advice regarding deduplication devices for NetWorker
> > backup environments.
> > 
> > I am all into doing with DataDomain, both VTL and NFS ways. However, not
> > to blindfold myself to much - are there any competitors, which could
> > compare with DataDomain today?
> 
> I don't know the market for dedup devices although I have worked with DD
> lately and rather like them.
> 
> If you want cheap dedup options, there is lessfs on Linux and dedup
> within ZFS. No idea how well these work.

Have played around with lessfs on Linux for some time and found that Networker 
savesets doesn't dedup well with fixed block dedupping. This is probably 
because the files in savesets almost always start at different positions within 
the device block and thus the block is different from last time even if the 
file 
hasn't changed. I just wish there was a feature in Networker to always start a 
file in a saveset on a device block boundary...
The compression feature of lessfs does give a around 50% gain, but a pure 
compressing filesystem would give you the same. (RFE someone influental... :-) )

Best
Dag


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