Integrated Lights-Out 3 technology

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settings for actual conditions rather than over-cooling the server. Refer to your server’s documentation to
determine the sensor and temperature information available through iLO 3.
HP Power Regulator
HP Power Regulator is an OS-independent power management capability of ProLiant servers that lets you
control power use without significantly affecting server performance. In its default configuration, Power
Regulator dynamically adjusts power consumption to match the workload of the server.
The Power Regulator firmware uses system processor performance registers to monitor processor
utilization. iLO 3 collects the data for each processor in the server when the server is on. iLO 3 does not
collect the utilization data when the server is in POST. You can configure Power Regulator settings to
switch the processor dynamically from one performance state, or P-state, to another as processor
utilization changes. Modifying the processor P-state by reducing or increasing processor voltage and
frequency can result in significant power savings with minimal performance degradation.
See the paper
“http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00300430/c00300430.pdf” for
more information.
Power Meter
The first step in managing power consumption at the server or facility level is to quantify how much power
a server is actually using. With iLO 3, you can view measured system power in Watts and BTU/hr. iLO 3
records and saves the data every 5 minutes. It displays the last 24 hours of power consumption data.
HP Power Capping – firmware based
Certain ProLiant servers support basic HP Power Capping that controls a server’s maximum power
consumption. The iLO 3 firmware monitors the server power consumption and checks it against a power
cap set by the administrator. iLO 3 firmware adjusts server power performance to maintain an average
power consumption that does not exceed the power cap setting. This lets you allocate data center cooling
resources more effectively based on actual server power consumption.
Basic power capping requires the following system firmware:
 iLO 3 version 1.00 or later
 System BIOS 2007.05.01 or later
Refer to your server’s user guide to determine whether the server supports Power Capping.
HP Dynamic Power Capping – hardware based
Some ProLiant servers support HP Dynamic Power Capping. iLO 3 implements Dynamic Power Capping
by using a server power microcontroller to measure and control power consumption. It brings a server
experiencing a sudden increase in workload back under its power cap in less than one-half second. This
prevents any surge in power demand that could cause a circuit breaker to trip (Figure 5). Dynamic Power
Capping can prevent tripping circuit breakers that have a specified trip time of three seconds or longer at
50° C and at a 150 percent overload.
You can set Dynamic Power Caps for individual servers from the iLO 3 user interface (with an iLO 3
Advanced Pack license). You can set Dynamic Power Caps for multiple rack-mount and blade servers from
the power management module within HP Insight Control Environment.
HP Dynamic Power Capping is OS-independent and functions with all software applications. It will
continue to function even if the OS should fail.