Aaah, that makes sense :)

If it's just performance you're after for small writes, I wonder if you've 
considered putting the ZIL on an NVRAM card?  It looks like this can give 
something like a 20x performance increase in some situations:

http://blogs.sun.com/perrin/entry/slog_blog_or_blogging_on

>From what I've read of the ZIL, it degrades gracefully when the NVRAM is full 
>too, reverting to storing the log in the main pool.
 
 
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