HP BladeSystem

IMPORTANT: If redundancy mode is set to Redundant, AC Redundant, or Power Supply Redundant, and power redundancy is lost, then you must either add additional power supplies or change the redundancy mode setting in the Onboard Administrator to restore Power Subsystem status. See the Insight Display for corrective steps.

Redundant

Redundant

For DC power supplies only. In this configuration, N power supplies are used to provide power and N are used to provide redundancy (where N can equal 1, 2, or 3). Up to three power supplies can fail without causing the enclosure to fail. When correctly wired with redundant DC line feeds, this configuration also ensures that a DC line feed failure does not cause the enclosure to power off.

AC Redundant

AC Redundant

For AC power supplies only. In this configuration, N power supplies are used to provide power, and N are used to provide redundancy (where N can equal 1, 2, or 3). Up to three power supplies can fail without causing the enclosure to fail. When correctly wired with redundant AC line feeds, this configuration also ensures that an AC line feed failure does not cause the enclosure to power off.

Power Supply Redundant

Power Supply

Up to six power supplies can be installed with one power supply always reserved to provide redundancy. In the event of a single power supply failure, the redundant power supply takes over the load. A line feed failure of more than one power supply causes the system to power off.

Not Redundant

None

There is no power redundancy and no power redundancy warnings are given. If all power supplies are needed to supply Present Power, then any power supply or line failure might cause the enclosure to brown out.

Dynamic Power

Dynamic Power

If enabled, Dynamic Power automatically places unused power supplies in standby mode to increase enclosure power supply efficiency, thereby minimizing enclosure power consumption during lower power demand. Increased power demands automatically return standby power supplies to full performance. This mode is not supported for low voltage on the c7000 enclosure.

Enclosure Dynamic Power Cap

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.

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.