HP ProLiant SL4500 Series Setup and Installation Guide

Cabling and powering up the chassis 45
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 Insight Display, 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 Insight Display command, or
different caps can be applied to user-defined groups by using flexible zones within the same rack.
NOTE: HP recommends configuring the Insight Display so that it controls only one 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.
Configuring a power cap
To configure power capping, you can use the following utilities:
• HP ProLiant Power Interface Control Utility
PPIC is a standalone utility that runs on a single server within the enclosure. For more information, see
the HP ProLiant Power Interface Control (PPIC) Utility User Guide on the HP website
(http://www.hp.com/support/PPIC_UG_en).
• HP ProLiant SL Advanced Power Manager
SL-APM is a rack level device that can control power caps for all enclosures in the rack. For more
information, see the HP ProLiant SL Advanced Power Manager User Guide on the HP website
(http://www.hp.com/support/SLAPM_UG_en).
Setting the chassis power cap mode with the PPIC utility
1. Download and install the HP ProLiant Power Interface Control Utility from the HP website
(http://www.hp.com/go/hpsc).