Here's one horror story of mine - ZFS taking over 20 minutes to flag a drive as 
faulty, with the entire pool responding so slowly during those 20 minutes that 
it crashed six virtual machines running off the pool:
http://www.opensolaris.org/jive/thread.jspa?messageID=369265&#369265

There are some performance tweaks mentioned in that thread, but I haven't been 
able to test their effectiveness yet, and I'm still concerned.  A pool 
consisting of nothing but three way mirrors should not even break a sweat when 
faced with a single drive problem.

When you're implementing what's sold as the most advanced file system ever, 
billed as good enough to obsolete raid controllers, you don't expect to be 
doing manual tweaks just so it can cope with a drive failure without hanging 
the entire pool.

ZFS has its benefits, but if you're not running it on Sun hardware you need to 
do a *lot* of homework.
-- 
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