IoT Hub manual failover is a feature of the IoT Hub that allows customers to failover their hub's operations from a primary region to the corresponding Azure geo-paired region. Manual failover can be done in the event of a regional disaster or an extended service outage. You can also perform a planned failover to test your disaster recovery capabilities, although we recommend using a test IoT hub rather than one running in production. The manual failover feature is offered to customers at no additional cost.
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