When a power loss occurs, the UPS device begins supplying power to your storage system from its batteries. The UPS can only supply power as long as its batteries still have enough charge. The UPS is there to give you time to shut down your storage system cleanly.
The following is the shutdown process:
Note: If you do not have AutoSupport enabled, the AutoSupport messages will not be generated.
- When the power loss occurs, an SNMP trap, AutoSupport message, and log messages are generated alerting you that the power loss has occurred.
- When the UPS has warningtime seconds of battery life remaining, Data ONTAP generates another SNMP trap, AutoSupport message, and log message.
- When the UPS has criticaltime seconds of battery life remaining, Data ONTAP generates another SNMP trap, AutoSupport message, and log message and starts shutting down the storage system.
Note: The criticaltime notifications may not be sent, depending on system load.
