UFS CG's and Thin Provisioning

I've been thinking about a storage "feature"
that some vendors such as 3Par are offering called
"Thin Provisioning".  It looks like this simply
allows you to fake out the size of a given volume, so that
while it appears there is, say, 2TB allocated, in fact there
is only 500G allocated.   What is warping my brain is what
effect this would have on UFS CG's and superblocks.  In a
setup like this, in fact with modern storage arrays in
general, the CG looks like an antiquated concept.

Does anyone have experience with this type of provisioning? 
Any thoughts on how big a problem this is or how its
handled?  Is this even a valid concern?

benr.
 
 
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