[krondor]

I'm not sure about FreeNAS, but I do want to point out this is possible in the btrfs filesystem (sharded raid across drives). I'm not aware of any FreeNAS equivalents though utilizing it, but rolling your own is certainly an option.

[nfriedly]

RockStor is a Linux/btrfs equivalent to FreeNAS - I've been running it for a few months and have been pretty happy overall.

http://rockstor.com/