Cannot export pool; Resource busy

$ zpool export foobar
cannot unmount '/Volumes/foobar': Resource busy

This occurs when exporting a pool (without the 'force' flag) as Apple's 
fseventsd is still holding 
onto an open resource (even though it's not using it at present). I suspect 
that the key problem is 
the fseventsd opens a file, and keeps it open, even though the disk isn't 
needed any more.

There may be a way to kick fseventsd in the future so that it goes away, but 
for the time being, this 
message may come up. The workaround is to use zpool export -f foobar.

Original issue reported on code.google.com by alex.ble...@gmail.com on 8 Mar 2010 at 1:49

Blocked on: #8

gmzang / maczfs

Cannot export pool; Resource busy #40