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Configuring the system
Power capping
The HP ProLiant XL family of products provides a power capping feature that operates at the server enclosure
level. The capping feature can be activated with PPIC.EXE, a stand-alone utility that runs in the environment
of one of the resident servers in the chassis to be power capped. After a power cap is set for the enclosure,
all the resident servers in the enclosure will have the same uniform power cap applied to them until the cap
is either modified or canceled.
With HP APM, the enclosure-level power capping feature can be expanded without the need to use the
PPIC.EXE utility. A global power cap can be applied to all enclosures with one HP APM command, or
different caps can be applied to user-defined groups by using flexible zones within the same rack.
Power capping modes
The following Power Management modes are standard and are configurable in the power management
controller:
•
Mode 0: No Redundancy
All power-capping is disabled. This mode can be used to minimize any possible performance impact of
power-capping logic.
•
Mode 1: Max Performance with Redundancy
This is the default power capping mode. This mode allows the maximum number of nodes to run by
engaging power-capping if the power draw from the chassis attempts to exceed the load supported by
the active power supplies. In this mode, the system is expected to survive an unexpected power loss to
one of the power supplies.
•
Mode 2: Full AC/DC Redundancy Mode
Power-capping is enforced such that system has N+1 power redundancy. In this mode, the system
should see no performance degradation because of a power supply loss.
•
Mode 3: User Configurable Mode
The user can specify a valid power cap value from a pre-defined range. A cap cannot be set below a
minimum or above a maximum. The cap includes all server nodes, fans, and drives. User configurable
mode requires an iLO Scale Out or iLO Advanced license.
NOTE:
Configuring a power cap
To configure power capping, you can use the following utilities:
•
HP ProLiant Power Interface Control Utility
Mode 3 is only supported through HP APM.
Configuring the system 33
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