Dell PowerVault MD1000 Hardware Owners Manual - Page 16
Enclosure Failover When Two EMMs are Installed, Enclosure Mode Switch Settings - management
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Figure 1-7. Enclosure Mode Switch Settings 1 2 1 unified mode switch setting 2 split mode switch setting NOTE: To change the enclosure mode, you must change the position of the enclosure mode switch before turning on power to the enclosure. Changing the position of the switch while the enclosure is on will not affect enclosure operation until the enclosure is rebooted. For a complete description of the roles of the primary and secondary EMMs, see "Operating Your Storage Enclosure." 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 and holds it in reset. 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. 16 About Your System