Finding a Disk's Serial Number in FreeNAS

When a harddisk pool in FreeNAS encounters many errors, FreeNAS would report errors. In this case, we need to figure out which physical disk may have problem. The following steps help us find out serial numbers of the disk,, in conjunction with the BIOS information, we may figure which physical disk has problem.

# show a list of disks with their GPT IDs
zpool status
# show the mapping beetween GPT IDs and device names
glabel status
# from above two steps, we can know which physical device may have 
# problem, e.g., /dev/ada5p2
sudo  smartctl -a /dev/ada5 | grep "Serial Number"