Lastly (for now) and getting back to the after-image extents... 2 ai extents is really not a very good idea. That makes it way too easy to get into a bind where normal operations (like making a backup) are difficult or impossible. You should have at least 4 ai extents as a very threadbare minimum. 8 is better. Large numbers of ai extents (more than 16), on the other hand, are not terribly useful.