12 disks in mirrored pairs is a small configuration. The "smaller" sets
you referrer to might be the number of disks in a raidz/raidz2/raidz3
top level vdev.
You say performance is one of your top priorities but what is the
workload ? Mostly read ? Mostly write ? Random ? Sequential ?
See the ZFS Best Practices guide on the solarisinternals.com site for
guidance on how to select your pool layout.
http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide
In particular this part:
http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#Storage_Pool_Performance_Considerations
--
Darren J Moffat
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