I am also accustomed to seeing diluted properties such as compressratio.  IMHO 
it could be useful (or perhaps just familiar) to see a diluted dedup ratio for 
the pool, or maybe see the size / percentage of data used to arrive at 
dedupratio.

As Jeff points out, there is enough data available to calculate this.  Would it 
be meaningful enough to present a diluted ratio property?  IOW, would that tell 
me anything than I don't get from simply using "available" as my fuel gauge?

This is probably a larger topic:  What additional statistics would be genuinely 
useful to the admin when there is space interaction between datasets.  As we 
have seen, some commands are less objective with dedup:

http://www.c0t0d0s0.org/index.php?url=archives/6168-df-considered-problematic.html
http://blogs.sun.com/jsavit/entry/deduplication_now_in_zfs

Thanks everyone...   -cheers, CSB
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