One of the quoted participants is Richard Elling, the other is Edward Ned 
Harvey, but my quoting was screwed up enough that I don't know which is which.  
Apologies.

>> >    zdb -DD poolname
>> This just gives you the -S output, and the -D output all in one go.  So I

>Sorry, zdb -DD only works for pools that are already dedup'd.
>If you want to get a measurement for a pool that is not already dedup'd, you 
>have to use -S

And since zdb -S runs for 2 hours and dumps core (without results), the correct 
answer remains:
zdb -bb poolname | grep 'bp count'
as was given in the summary.

The theoretical output of "zdb -S" my be superior if you have a version that 
works, but I haven't seen anyone mention onlist which version(s) it is, or 
if/how it can be obtained; short of recompiling it yourself.

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