For most of my ZFS solutions, you better bet that I have a table and a set of labels identifying drives by their partial SAS WWN. This is a function of the LSI controllers I use, which read like:
NAME STATE READ WRITE CKSUM
vol1 ONLINE 0 0 0
mirror-0 ONLINE 0 0 0
c10t50000393482B340Cd0 ONLINE 0 0 0
c10t50000393482B4CF0d0 ONLINE 0 0 0
mirror-1 ONLINE 0 0 0
c10t50000393482B4DB4d0 ONLINE 0 0 0
c10t50000393482BAB48d0 ONLINE 0 0 0
mirror-2 ONLINE 0 0 0
c10t50000393482BDA68d0 ONLINE 0 0 0
c10t500003935803910Cd0 ONLINE 0 0 0
There are a couple of options to getting this to work. One is the commercial SanTools SMARTmon utility that's available to OEMs and integrators. It leverages the SCSI Enclosure Services (SES) features in external JBOD units, but has some magic for internal disks, too.
You may also have an option depending on the controller you're using. Are you just using a motherboard controller or a purpose-built non-RAID SAS HBA?