cam control

root@canolfan:~ # camcontrol devlist -v | grep scbus7
scbus7 on mps0 bus 0:
<ATA WDC WD2000FYYZ-0 1K02>        at scbus7 target 1 lun 0 (da2,pass2)
<ATA WDC WD2000FYYZ-0 1K02>        at scbus7 target 2 lun 0 (da3,pass3)
<ATA WDC WD2000FYYZ-0 1K02>        at scbus7 target 7 lun 0 (da4,pass4)
<>                                 at scbus7 target -1 lun ffffffff ()