How to get smartmontools to talk to your disks on a T5220:
By example:
Say you have a zpool on “c3t1d0s0” and “c3t0d0s0”. Then try:
$ sudo /opt/stow/smartmontools-6.2/sbin/smartctl -d scsi -a /dev/rdsk/c3t1d0s0
$ sudo /opt/stow/smartmontools-6.2/sbin/smartctl -d scsi -a /dev/rdsk/c3t0d0s0