Verifying the system ID change on an HA system

You must confirm the system ID change when you boot the replacement controller and then verify that the change was implemented.

1. If the replacement controller is in Maintenance mode (showing the *> prompt, exit Maintenance mode and go to the LOADER prompt: halt
2. From the LOADER prompt on the replacement controller, boot the controller, entering y if you are prompted to override the system ID due to a system ID mismatch:boot_ontap
3. Wait until the Waiting for giveback... message is displayed on the replacement controller console and then, from the healthy controller, verify that the new partner system ID has been automatically assigned.

   Example

   node1> <kbd className="ph userinput nolinebreak">storage failover show</kbd>
                                       Takeover          
   Node              Partner           Possible     State Description 
   ------------      ------------      --------     -------------------------------------
   node1             node2             false        System ID changed on partner (Old:
                                                     151759755, New: 151759706), In takeover    
   node2             node1             -            Waiting for giveback (HA mailboxes)
   
4. From the healthy controller, verify that any coredumps are saved:
   1. Change to the advanced privilege level: set -privilege advanced

      You can respond Y when prompted to continue into advanced mode. The advanced mode prompt appears (*>).

   2. Save any coredumps: system node run -node local-node-name partner savecore
   3. Wait for savecore command to complete before issuing the giveback.
      You can enter the following command to monitor the progress of the savecore command: system node run -node local-node-name partner savecore -s
   4. Return to the admin privilege level: set -privilege admin
5. Give back the controller:
   1. From the healthy controller, give back the replaced controller's storage: storage failover giveback -ofnode replacement_node_name
      The replacement controller takes back its storage and completes booting.

      If you are prompted to override the system ID due to a system ID mismatch, you should enter y.

      Note

      If the giveback is vetoed, you can consider overriding the vetoes.

      If giveback is vetoed

   2. After the giveback has been completed, confirm that the HA pair is healthy and that takeover is possible: storage failover show

      The output from the storage failover show command should not include the System ID changed on partner message.

6. Verify that the expected volumes are present for each controller: vol show -node node-name
7. If you disabled automatic takeover on reboot, enable it from the healthy controller: storage failover modify -node replacement-node-name -onreboot true