Dell POWEREDGE M1000E - Manual (Page 201)

health is marked non-critical. If the smaller grid cannot support the total chassis power allocations, then grid
redundancy status is reported as No Redundancy and Chassis health is displayed as Critical.
Power Supply Redundancy Policy
The power supply redundancy policy is useful when redundant power grids are not available, but you may want to be
protected against a single PSU failure bringing down your servers in a modular enclosure. The highest capacity PSU is
kept in online reserve for this purpose. This forms a Power Supply redundancy pool. The figure below illustrates power
supply redundancy mode.
PSUs beyond those required for power and redundancy are still available and is added to the pool in the event of a
failure.
Unlike Grid Redundancy, when power supply redundancy is selected, CMC does not require the PSU units to be present
in any specific PSU slot positions.
NOTE: Dynamic Power Supply Engagement (DPSE) allows PSUs to be placed in standby. The standby state
indicates a physical state during which power is not supplied from the PSU. When you enable DPSE, the extra
PSUs may be placed in Standby mode to increase efficiency and save power.
Figure 6. Power Supply Redundancy: Totally 4 PSUs with a failure of one PSU
No Redundancy Policy
The no redundancy mode is the factory default setting for three PSU configuration and indicates that the chassis does
not have any power redundancy configured. In this configuration, the overall redundancy status of the chassis always
indicates no redundancy. The figure below illustrates no redundancy mode is the factory default setting for three PSU
configuration.
CMC does not require the PSU units to be present in any specific PSU slot positions when No Redundancy is configured.
NOTE: All PSUs in the chassis are Online if DPSE is disabled when in No Redundancy mode. When DPSE is enabled
all active PSUs in the chassis are listed as Online and additional PSUs may be turned to Standby to increase the
system's power efficiency.
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