I've been posting about this since the beginning on the year. A few times on freebsd-questions, once on freebsd-hackers, and submitted a PR (http://www.freebsd.org/cgi/query-pr.cgi?pr=48165).
Are you sure that configuring the TX2 as "RAID 0" array is what you want to do, vs "SPAN" (aka JBOD)?
I would guess that under vinum, span/jbod would be best, but just guessing.
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