Integrated Lights-Out 3 technology

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Figure 5: Dynamic Power Capping can avoid circuit breaker trips
Dynamic Power Capping requires HP ProLiant hardware and the following system firmware:
 System BIOS 2008.11.01 or later
 iLO 3 version 1.00 or later
 Firmware version 3.4 or greater for HP ProLiant G5 and c-Class blades servers
 Firmware version 2.32 or greater for HP ProLiant G6 servers in ML and DL form factors
 Onboard Administrator firmware version 2.32 or later for HP BladeSystem enclosures
Refer to the support matrix at http://h18004.www1.hp.com/products/servers/management/dynamic-
power-capping/support.html for more information.
Sensors and fan control – Sea of Sensors
HP developed the Sea of Sensors to increase server performance and decrease power utilization. This lets
you optimize server provisioning and deployment in the data center. The Sea of Sensors monitors
temperature in strategic places throughout the system and allows iLO 3 to control the RPM of each fan
individually.
In ProLiant G7 servers, iLO 3 firmware v 1.00 incorporated and expanded on the sensor control functions
of the south bridge I/O chip. The iLO 3 firmware uses a proportional–integral–derivative (PID) control
feedback algorithm to set and control the speed for each fan. The PID algorithm allows much tighter
control than previous multi-segment sensors. It takes into account the following elements:
 Proportional control: The algorithm output varies based on the temperature as compared to the target
set point.
 Integral control: The output varies based on the sum of the temperature changes over time. This is a
function of how long the system takes to get closer to the target temperature set point.
 Derivative control: The output varies based on the rate of temperature change over time. A greater rate
of change in temperature results in increased fan speed.