This already exists -- it just not open sourced, and you could spend 
years trying to create it.  Trust me, once you start dealing with the 
distributed issues with this, its gets very complex.  I am not meaning 
to discourage you, but there are patents already filed on this on 
Linux.    So you need to consider these as well, and there are several 
folks who are already doing this or have done it.  If it goes into 
Microsoft endorsed cross licensed Linuxes It may be ok (Vertias sold 
this capability to Microsoft already, about 12 patents there to worry 
over).  There's also another patent filed as well.  It's a noble effort 
to do a free version, but be aware there's some big guns with patents 
out there already, not to mention doing this is complex beyond belief. 

Anyway good luck.  ~~~~
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