Sen­sor sup­port is a “small” prob­lem for me: What I don’t under­stand is why the FreeB­SD team refuse to include the geom_raid5 mod­ule used in FreeNAS !
The exist­ing geom_vinum mod­ule includ­ed in FreeB­SD ⁶⁄₇ is too bug­gy for RAID 5: This is why FreeNAS uses anoth­er not-official more sta­ble geom mod­ule. But this mod­ule was nev­er accept­ed to be includ­ed in FreeB­SD. Now the orig­i­nal devel­op­er of geom_raid5 stop to main­tains it (dis­cour­aged), and it’s very hard to found some­one to adapt it to FreeB­SD 8.0.