Power efficiency – HP Integrated Lights-Out 2 User Manual
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You must have the Configure iLO 2 Settings privilege to view the Power Regulator for ProLiant Data
page. Power Regulator for ProLiant Data is a licensed feature available with the purchase of
optional licenses. For more information, see
.
To access the Power Regulator for ProLiant Data page, click Power Management>Processor States.
The Power Regulator Data page displays the collected p-state data, starting from host power up
once a second and then refreshes for display once every 5 minutes. The system ROM reads the
current status of each logical processor. The status register in Intel-based platforms reflects the
current operating frequency and voltage. Because of multiple processor dependencies, the status
might or might not reflect an absolute p-state. The frequency might be at one p-state and the voltage
at a higher p-state. The system ROM updates the p-state count of the p-state for the current frequency
and not the current voltage.
Data is displayed using a bar graph, with the total bar length representing 100% of the time
covered by the data. One data graph is displayed for each processor or core. Data graphs for
multiple threads on a processor or core that supports Hyper-Threading are not displayed. A portion
of the bar is colored differently for each p-state the processor was in, with each colored portion
scaled to represent the percentage of the total time the processor spent in that p-state. Pausing the
mouse over the bar graph displays a tool tip that indicates the numeric percentage that portion of
the bar represents.
Power efficiency
iLO 2 enables you to implement improved power usage using a High Efficiency Mode (HEM).
HEM improves the power efficiency of the system by placing the secondary power supplies into
step-down mode. When the secondary supplies are in step-down mode, the primary supplies
provide all the DC power to the system. The power supplies are more efficient (more DC output
Watts for each Watt of AC input) at higher power output levels, and the overall power efficiency
improves.
When the system begins to draw more than 70% capacity of the maximum power output of the
primary supplies, the secondary supplies return to normal operation (out of step-down mode).
When the power use drops below 60% capacity of the primary supplies, the secondary supplies
return to step-down mode. HEM enables you to achieve power consumption equal to the maximum
power output of the primary and the secondary supplies, while maintaining improved efficiency
at lower power usage levels.
HEM does not affect power redundancy. If the primary supplies fail, then the secondary supplies
immediately begin supplying DC power to the system, preventing any downtime.
Power management
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