From owner-freebsd-hackers@FreeBSD.ORG  Fri Mar 27 08:39:02 2015
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
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>
> Does anyone have anything that we can expose to userland / GEOM?

there are some SATA protocol extension proposed that would just show what 
are stripe ranges.

I thing nandfs is the best starting point to implement filesystem on them.