if you rsync data to zfs over existing files, you need to take something more 
into account:

if you have a snapshot of your files and rsync the same files again, you need 
to use "--inplace" rsync option , otherwise completely new blocks will be 
allocated for the new files. that`s because rsync will write entirely new file 
and rename it over the old one.

not sure if this applies here, but i think it`s worth mentioning and not 
obvious.....
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