Verifying takeover by a standby controller

To verify that a standby Z controller can take over the functions of the Z controller, perform these actions:

Stop the Z controller.
Issue the following command:
```
MODIFY ssname,TAKEOVER
```
Check that the following message appears in the message log:
Standby Z controller message
```
EQQZ129I TAKEOVER IN PROGRESS
```

When the standby Z controller has taken over the functions of the Z controller, more messages will appear in the message log. These are the same messages that appear when a Z controller is started. Verify that the takeover was successful by following the procedures used in the verification of the Z controller.