HP BladeSystem Onboard Administrator User Guide - HP Business ...

Do not set a Static Power Limit or Enclosure Dynamic Power Cap on an empty enclosure.
Mode Insight Display
name
Enclosure Dynamic
Power Cap
Description
None An optional feature that enables you to cap the servers in an
enclosure as a group. As the servers run, the demand for
power varies for each server. A power cap for each server is
automatically adjusted to provide the server with enough
power to meet workload demands while still conforming to
the Enclosure Dynamic Power Cap.
The feature is enabled with three configuration parameters:
• Dynamic Power Cap—Total enclosure average power
will not exceed Dynamic Power Cap.
• Derated Circuit Capacity—Average power on a single
circuit will not exceed Derated Circuit Capacity.
• Rated Circuit Capacity—Peak power on a single circuit
will not exceed Rated Circuit Capacity.
When configuring these parameters, the Derated Circuit
Capacity must be at least as large as the Dynamic Power
Cap and no larger than the Rated Circuit Capacity.
The Dynamic Power Cap is used to limit the enclosure power
consumption based on a cooling constraint that might be
lower than the Derated Circuit Capacity. The Derated Circuit
Capacity is used to limit the enclosure average power
consumption on a circuit. The Rated Circuit Capacity is used
to limit the enclosure peak power consumption on a circuit.
If you need to restrict an enclosure electrical load and
thermal output, an Enclosure Dynamic Power Cap is better
than a Static Power Limit. Enclosure Dynamic Power Cap
enables more blades to power on than a Static Power Limit.
For a complete list of BladeSystem server blades supported
by Enclosure Dynamic Power Capping, see the HP website
(http://www.hp.com/go/dpc).
Static Power Limit Power Limit An optional setting to limit power. Whenever you attempt to
power on a device, the total power demands of the new
device and of the devices already on are compared against
this Static Power Limit. If the total power demands exceed the
limit, the new device is prevented from powering on.
A Static Power Limit is better when:
• You do not want caps dynamically adjusted on your
blades.
• You prefer to not power on a server blade if it cannot be
allocated full power (even if it typically consumes less).
• More than 1/4 of the blades in the enclosure do not meet
hardware or firmware requirements for the Enclosure
Dynamic Power Cap.
None None The enclosure power usage is not managed or capped.
Understanding Power Capping, Dynamic Power Capping, and Enclosure Dynamic Power Capping
HP delivers three varieties of power management that allows users to limit the server power consumption. All
three power capping varieties work to limit consumption to a specified Watt or Btu/hr goal. The three
technologies are Power Capping, Dynamic Power Capping, and EDPC.
Power Capping
Configuring the HP BladeSystem c7000 enclosure and enclosure devices 164