Initiate Redundancy Commands in the RMCT
On the Synchronization tab in the RMCT, you can initiate these redundancy commands:
- Synchronize Secondary
- Disqualify Secondary
- Initiate Switchover
- Become Primary
Redundancy Commands
Synchronization events are logged on the Synchronization tab of the RMCT and can help you troubleshoot redundancy issues. See View the Synchronization Log.
Synchronize Secondary
The Synchronize Secondary command forces the primary redundancy module to attempt synchronization with its partner. This command is available only when the chassis redundancy state is one of the following:
- Primary with Disqualified Secondary
- Disqualified Secondary
Synchronization is asynchronous with the execution of this command. Successful execution of this command begins with synchronization, which can take several minutes. Monitor the chassis status at the bottom of the RMCT to determine when synchronization is complete.
Disqualify Secondary
The Disqualify Secondary command forces the primary redundancy module to disqualify its partner.
ATTENTION:
Disqualifying the secondary chassis makes it unable to assume control functions and redundancy is lost. If you disqualify the secondary and a major fault occurs on the remaining primary, a switchover does not occur.
This command is available only when the chassis redundancy state is one of the following:
- Primary with Synchronized Secondary
- Synchronized Secondary
If you use the Disqualify Secondary command when the Auto-synchronization setting is Always, a synchronization attempt occurs immediately after the secondary chassis becomes disqualified. To keep the secondary disqualified after initiating the Disqualify Secondary command, set Auto-synchronization to Conditional or Never before disqualifying the secondary.
Initiate Switchover
The Initiate Switchover command forces the system to initiate an immediate switchover from the primary chassis to the secondary chassis. Reasons to initiate a switchover manually include these scenarios:
- During a redundancy firmware update
- After you complete maintenance on one chassis in the redundant chassis pair
- To perform a test of your redundant system behavior by simulating a failure that is detected in the primary chassis
This command is available only when the chassis redundancy state is one of the following:
- Primary with Synchronized Secondary
- Synchronized Secondary
Become Primary
The Become Primary command forces a disqualified secondary chassis to become a primary chassis. This command is available only when the chassis redundancy state is Secondary with No Primary.
IMPORTANT:
When you initiate the Become Primary command, the controller restarts with the controller project erased. During the power-up process, the controller is unavailable. Once the controller is powered-up, download your current project to the controller.
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