HP ProLiant G7 c-Class server blades with Intel® Xeon® processors

Power Savings mode. The latter automatically
Additional information on the HP Power Regu
adjusts available power to match processor demand.
lator is provided in the paper titled “Power Regulator for
ProLiant servers”:
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00300430/c00300430.pdf.
HP Dynamic Power Capping
HP Dynamic Power Capping achieves the goal of maintaining server power consumption at or below
the cap value set by an administrator. HP Dynamic Power Capping can bring a server experiencing a
sudden increase in
response prevents any surge in power demand that could cause a typical data center circu
workload back under its power cap in less than one-half second. This fast
it breaker
to trip. Dynamic Power Capping prevents tripping circuit breakers that have a specified trip time of
percent overload.
.com/bc/docs/support/SupportManual/c01549455/c01549455.pdf
three s
econds or longer at 50° C and 150
The ability to keep server power consumption below the power cap in real time means that Dynamic
Power Capping can be an effective tool in planning and managing both electrical provisioning and
cooling requirements in the data center. An administrator can electrically provision a PDU or a rack to
something less than the full faceplate power rating of all the servers supported because Dynamic
Power Capping guards against any unexpected change in power consumption that might cause a
circuit breaker to trip.
Support for Dynamic Power Capping requires iLO 2 version 1.70 or later, system BIOS 2008.11.01
or later, and BladeSystem Onboard Administrator firmware version 2.32 or later for HP BladeSystem
enclosures.
For detailed information about HP Dynamic Power Capping, refer to the HP technology brief titled
“HP Power Capping and HP Dynamic Power Capping for ProLiant servers”:
http://h20000.www2.hp .
ned Enclosure Dynamic Power Capping
technology specifically for BladeSystem
ht
strator (OA) firmware
sting cap
levels on individu
al server blades. Special hardware on each server blade lowers the processor
erver’s energy use
0 seconds. Normally, the OA software can quickly raise a low power cap
HP Enclosure Dynamic Power Capping
HP has desig
enclosures. It allows your administrator to set a power cap on an enclosure by using either HP Insig
Control power management (ICpm) version 2.0 or later, or Onboard Admini
version 2.30 or later
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. The OA monitors and maintains the enclosure’s power cap by adju
performance states (P-states), throttles the processor clock, or both, to keep the s
below the cap.
The total power for an enclosure includes the power used by the managed server blades as well as
the power used by unmanaged devices such as I/O peripherals (switches) and cooling fans. The OA
cannot control the power use of unmanaged devices, so it calculates a blade server power budget
that represents the maximum amount of power the servers can consume. With the blade power
budget as its limit, the OA software uses a sophisticated algorithm to increase the power caps of
busier server blades and decrease the caps of less busy server blades. This power reallocation
process is repeated every 2
for an idle server blade when it receives new work with little overall impact on enclosure
performance. And if the power demand of all the server blades exceeds the available energy, the OA
will share the available power among all busy server blades.
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See the Blade Servers Support Matrix at http://h18004.www1.hp.com/products/servers/management/dynamic-
power-capping/support.html.
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