I can only be hypothetical about this command, I can’t try it on any of our real filers (disks are expensive!), and on the simulator all disk labels are apparently invalid!

To change or edit a disks label, you need to put the disk into maintenance mode first.

labelmaint isolate disk_id

Once a disk is in maintenance, you can start relabelling it.

usage: label list | summary | examine | examinev1 | compare | edit | editv1 |
keep |restore | save | makeraid | makespare | buildtree | wipe | wipev1 |
vuinfo