Figure 23. Power Architecture - Dell PowerEdge M1000e Technical Manual

Dell
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When Dynamic Power Supply Engagement (DPSE) is enabled, the PSU units move between On and Off
states depending upon actual power draw conditions to achieve high power efficiency by driving
fewer supplies to maximum versus all with partial and less-efficient loading.
In the N+N power supply configuration, the system will provide protection against AC grid loss or
power supply failures. If one power grid fails, three power supplies lose their AC source, and the
three power supplies on the other grid remain powered, providing sufficient power for the system to
continue running. In the N+1 configuration only power supply failures are protected, not grid
failures. The likelihood of multiple power supplies failing at the same time is remote. In the N+0
configuration there is no power protection and any protection must be provided at the node or
chassis level. Typically this case is an HPCC or other clustered environment where redundant power
is not a concern, since the parallelism of the processing nodes across multiple system chassis
provides all the redundancy that is necessary.
The midplane carries all 12 Volt DC power for the system, both main power and standby power. The
CMCs, LCD and Control Panel are powered solely by 12 Volt Standby power, insuring that chassis level
management is operational in the chassis standby state, whenever AC power is present. The server
modules, I/O Modules, Fans, and iKVM are powered solely by 12 Volt Main power.
PowerEdge M1000e Technical Guide

Figure 23. Power Architecture

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