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After the redundancy feature has been configured and is enabled, you can control its behavior using the redundancy control commands:
CAUTION: The commands below MUST only be run on one of the sites. Running commands on both sites simultaneously can lead to the HA system not working properly.
- redundancy control set-preferred-site – Updates the preferred site. Effective as soon as it is entered. Does not require a redundancy restart.
- Three options are available: none, site-a, site-b.
- redundancy control start – Activates redundancy feature. If successful, data replication/resource monitoring will start.
- redundancy control stop – Stops the redundancy feature. Replication, monitoring and failover functions are all stopped.
- Stopping redundancy will stop data replication. Data will be stored to the data store on the active site only.
- Redundancy feature can be stopped on both sites by running redundancy control stop command on a site only.
- However, the redundancy feature must be stopped by manually rerunning redundancy control stop command again on the remaining site if a site is in shutdown or unreachable while stopping the redundancy feature process.
- Do not force reboot/shutdown Skylight orchestrator while stopping redundancy feature process.
- redundancy control restart – Equivalent to entering the start and stop commands. If you change the redundancy configuration, you must enter the restart command.
- redundancy control switch – Switches the active site (from the site that is currently active to the site that is currently passive). If a manual switch is initiated, the Preferred-site option will be automatically set to none.
- redundancy control suspend – This command puts the redundancy features completely on hold:
- It disables failover (automatic and manual).
- It stops replication and monitoring immediately.
- Failover will not occur regardless of the conditions.
- Important:
- redundancy control resume – Re-enables automatic failover after the suspend command was executed.
- redundancy control handle-split-brain – Handling data cannot synchronize between two sites issue.
All commands are run from the appliance console. See Accessing the Appliance Console.
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