> 
> What was wrong with LVM snapshots?  Performance?

in zfs every write is 'copy on write', so snapshots have 'zero' cost, and 
multiple snapshots can use same data.
in LVM every snapshot is standalone and has all the information it needs. also 
LVM doesn't have snapshot-based replication, and DRBD+ wasn't opensource/free 
at that time either ;-

Though reasons of OpenSolaris vs Solaris are different. 

Domas
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