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
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 the possibility of 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
.
• 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 continues until
the power feed is brought back online. In this mode, the system is expected to survive an unexpected loss
of an entire power feed to half of the power supplies.
Configuring a power cap
To configure power capping, you can use the following utilities:
• HPE ProLiant Power Interface Control Utility
PPIC is a standalone utility that runs on a single server within the enclosure. For more information, see the
ProLiant Power Interface Control (PPIC) Utility User Guide
on the
Hewlett Packard Enterprise website
.
• Apollo Platform Manager
APM is a rack level device that can control power caps for all enclosures in the rack. For more information,
see the
HPE Apollo Platform Manager User Guide
on the
Hewlett Packard Enterprise website
.
Power capping modes
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