Enclosure failover when two EMMs are installed

NOTE: At least one EMM must be installed in the enclosure. If only one EMM is installed in the enclosure, it must be installed in the primary EMM bay and a blank must be installed in the secondary EMM bay. See Installing an EMM blank .

Figure 5. Enclosure Management Module

Item	Indicator,	Icon	Description
	Button, or
	Connector

1,2,3,4	SAS port (Input or		Provides SAS connections for cabling the host or an upchain
	Output)		expansion enclosure and to the next down chain expansion
			enclosure in a daisy chain.(Single Port, Redundant, and Multi-
			chain Configuration)
5	USB Mini-B (serial		For engineering use only.
	debug port)
6	7-Segment		Display the enclosure location in SAS Chain.
	Display

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 network communication is ended 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 enclosure LEDs, power supply units, and fans.

EMM thermal shutdown

If critical internal temperatures are reached, the enclosure turns off automatically through either a thermal shutdown command issued by the EMM firmware or through a command from Dell OpenManage Server Administrator.

MD1400 specifications

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