Well, then you could have more "logical space" than "physical space", and that 
would be extremely cool, but what happens if for some reason you wanted to turn 
off dedup on one of the filesystems? It might exhaust all the pool's space to 
do this. I think good idea would be another pool's/filesystem's property, that 
when turned on, would allow allocating more "logical data" than pool's 
capacity, but then you would accept risks that involve it. Then administrator 
could decide which is better for his system.
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