How to failover a two data center deployment

If a failure occurs in your active data center, then failover to your warm-standby data center.

Before you begin the failover process, first confirm that failover is the correct action to take.

Failover to the warm-standby is the appropriate action to take in the following circumstances:

The failure is with the active data center itself, for example:
- All VMs in the active data center are down.
- Network connectivity to the active data is down.
The API Connect deployment in the active data center is in a failed state. For example, the health-check command returns errors, and you are not able to resolve these errors.
```
apicup subsys <subsystem name> health-check
```

The failover steps that you must follow depend on the condition of your active data center: