Dell POWEREDGE M1000E - Manual (Page 202)

Figure 7. No Redundancy with three PSUs in the chassis
A PSU failure brings other PSUs out of Standby mode, as needed, to support the chassis power allocations. If you have
four PSUs, and require only three, then in the event that one fails, the fourth PSU is brought online. A chassis can have
all six PSUs online.
When you enable DPSE, the extra PSUs may be placed in Standby mode to increase efficiency and save power. For
more information, see
Default Redundancy Configuration .
Extended Power Performance (EPP)
Extended Power Performance mode enables allocation of 30% additional power in a configuration of six Power Supply
Units (PSUs), to the M1000e chassis, than the redundant power in a Grid Redundancy configuration using 3000 W AC
PSUs. However, the power allocated to servers is automatically reduced in the event of an AC grid failure or a PSU
failure, so that the servers are not powered off. A maximum of 2700W power can be allocated to support chassis with
high-end configurations.
By default, the EPP feature is enabled on six 3000W AC power supply configuration. You can view the current setting,
disable and enable this feature using both the Web interface and the Command Line interface.
EPP feature allows power allocations only when:
• Power is configured for Grid redundancy.
• There are six PSUs that are of 3000W AC type.
• System Input Power Cap is higher than 13300W AC (45381 BTU/h).
The power gained using EPP mode is available for increasing the server performance. When compared with a six 2700W
AC PSU configuration, the additional power available on a six 3000W AC PSU configuration with Enhanced Cooling
Mode for fans enabled and active is 723W. When compared with a six 2700W AC PSU configuration, the additional
power available in standard fan configurations mode, is 1023W.
The EPP additional power available is 2700W, which can be used to increase server performance only.
The EPP mode can be enabled only when the following power features are disabled:
• Max Power Conservation Mode (MPCM)
• Dynamic Power Supply engagement (DPSE)
• Server Based Power Management (SBPM)
• Server Performance Over Power Redundancy (SPOPR)
Trying to enable EPP when any of the four features, MPCM, DPSE, SBPM or SPOPR, is enabled results in display of a
message. The message prompts you to disable these four features before Extended Power Performance mode can be
enabled. When Extended Power Performance mode is enabled, any of these other three features, DPSE, SBPM or
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