Update: After a little more research, I've got it setup.
The one remaining question I have now is that with a UFS file system, my current vfstab entry,
( /dev/dsk/c2d0s6 /dev/rdsk/c2d0s6 /export/home/myfolder/ ufs 2 yes - )
if the added disk happens to not be available, it prevents the server...