Superb news, thanks Jeff.

Having that will really raise ZFS up a notch, and align it much better with 
peoples expectations.  I assume it'll work via zpool import, and let the user 
know what's gone wrong?

If you think back to this case, imagine how different the users response would 
have been if instead of being unable to mount the pool, ZFS had turned around 
and said:

"This pool was not unmounted cleanly, and data has been lost.  Do you want to 
restore your pool to the last viable state: (timestamp goes here)?"

Something like that will have people praising ZFS' ability to safeguard their 
data, and the way it recovers even after system crashes or when hardware has 
gone wrong.  You could even have a "common causes of this are..." message, or a 
link to an online help article if you wanted people to be really impressed.
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