On Mon, Jul 13, 2015 at 5:19 PM, Simon Hobson <li...@thehobsons.co.uk>

> > What's needed is a file system that can do what hard links do, but at the
> > file page level.  I imagine that this would work using the same Copy On
> > Write logic used in managing memory pages after a fork().
> Well some (all ?) enterprise grade storage boxes support de-dup - usually
> at the block level. So it does exist, at a price !

zfs is free and has de-dup. It takes more RAM to support it well,  but not
prohibitively so unless your data is more than a few TB. As with any dedup
solution, performance does take a hit and its often not worth it unless you
have a lot of duplication in the data.

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