Failover Events
The events that result in a failover, and the response to each event by the primary and secondary EMS server instances are described in this section.
| Event | Active EMS Instance Reaction | Standby EMS Instance Reaction |
|---|---|---|
| Failure of the active EMS server instance, other than a write failure. | The EMS server attempts to restart and synchronize with the activated standby server. | Activates the EMS server instance and begins local writes. |
| Failure of the active EMS server hardware. | n/a | Activates the EMS server instance and begins local writes. |
| Failure of the standby EMS server hardware. | Performs local writes only. | n/a |
| An internal system error on the active appliance. | Stops the EMS server instance. | Activates the EMS server instance and begins local writes. |
| An internal system error on the standby appliance. | Performs local writes only. | Cannot be activated. |
| Active EMS server local write fails. | Stops the EMS server instance. | Activates the EMS server instance and begins local writes. |
| Standby EMS server local write fails. | Performs local writes only. | The EMS server restarts. |
| Failure of the standby EMS server, other than write failure. | Performs local writes only. | The EMS server attempts to restart and synchronize with the active server. |
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