clustered ontap 8.3 change shelf id on disks

Hi ,

I have a clustered ontap 8.3.2 ( FAS 8020) . Recently i added a disk shelf , however it picked up a wrong shelf id (basically shelf id 7) and i already have another shelf with same ID.

I changed it on the shelf to 8 . However the new disks are still seeing them as 7 , i power cycled the shelf but still no good.

how do i change the shelf id on the disks?