Enclosure Failover When Two EMMs are Installed
If two EMMs are installed, a certain degree of failover is offered. Control and monitoring of the enclosure elements can be transferred from one EMM to another in the event of an EMM failure. A failover occurs whenever communication is lost between an EMM and its peer.
In the event of a peer EMM failure, the surviving EMM activates the amber status LED of the failed EMM. The surviving EMM then takes over the responsibility of enclosure management, which includes monitoring and control of the audible alarm, enclosure LEDs, power supplies, and fans.
Failover does not include providing connectivity to the drives controlled by the failed EMM. When a failed EMM is replaced, enclosure management functions do not automatically return to the replaced EMM unless an additional failure occurs that triggers another failover event. The new EMM only restores the data path to the hard drives controlled by the failed EMM.
EMM Thermal Shutdown
If critical internal temperatures are reached, the enclosure shuts down automatically through either a thermal shutdown command issued by the EMM firmware or through a command from Dell™ OpenManage™ Server Administrator.
Enclosure Alarms
An audible alarm is activated if any of the fault conditions listed below occur.
The alarm sounds continuously if:
•More than one fan has failed or a power supply/cooling fan module is not installed.
•One or more temperature sensors are in critical range.
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