Configuring the system 33
Configuring the system
Power capping
The HPE 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 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 APM command, or different
caps can be applied to user-defined groups by using flexible zones within the same rack.
Power capping modes
NOTE: Mode 4 is only supported through APM.
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 (with degraded
performance) an unexpected power loss to one or more 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
will throttle the nodes allowing for one of the available power supplies to be held in reserve. If only
one power supply is available, the system will throttle the nodes as to allow the full use of that power
supply’s capacity.
• 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.
• Mode 4: Rack Level Dynamic Power Capping Mode
In conjunction with APM, the user can specify a maximum power capacity for the entire rack. The
APM dynamically allocates power to the applicable chassis within the rack to maximize performance
given the available power. For more information, see the HPE Apollo Platform Manager User Guide
on the Hewlett Packard Enterprise website (http://www.hpe.com/support/APM_UG_en).
• Mode 5: Power Feed Redundancy Mode
When used with an A+B power feed configuration, Power Feed Redundancy Mode throttles the
system 100%, bringing the nodes to a complete stop if a power feed loss is deduced. Full throttling
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