Craig Barratt wrote at about 23:24:41 -0800 on Monday, March 1, 2010:
 > Jeffrey,
 > 
 <snipped> 
 > Craig

ALL SOUNDS AWESOME and thanks for the helpful and patient responses to
my questions and suggestions.

Sounds like a lot of work though and kudos to you to committing to
such an extensive upgrade -- are you going to have the time and
resources to get this done in 2010 (or 2011 or 2012 ;)?

One more question if you don't mind...
Can you give an outline of how expiry works in the absence of
hard-links? Specifically, without walking through the whole pc tree
each night and tabulating all the md5sum references, how do you know
when a pool file no longer has any remaining pc-tree references and
therefore can be deleted from the pool? And if you do walk through the
pool, can you do anything better than an O(n log n) type sort of the
resulting md5sum lists that you would presumably construct?

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