Installation Manual

Configuring the HP Moonshot System 44
Power capping
The HP Moonshot System provides a power capping feature that operates at the chassis level. The capping
feature can be activated using the iLO CM firmware that runs on each HP Moonshot 1500 chassis. After a
power cap is set for the chassis, all the resident cartridges in the chassis 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 iLO
CM firmware. A global power cap can be applied to all chassis 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 HP Moonshot 1500 Chassis supports different power capping modes. The setting impacts how the
chassis reacts to changes in power supply functionality, such as loss of input power to a power supply or
failure or removal of a power supply from the system. Selecting the appropriate power capping mode
depends on system requirements, how the chassis is provisioned, and how power feeds are supplied. The
power capping mode alone does not guarantee availability in the event of power loss. The chassis requires
at least two power supplies. The type and number of power supplies depends on the cartridges installed in
the chassis.
The following power capping modes are standard and are configurable in the power management
controller:
• Mode 0: No Redundancy
All power-capping is disabled. This mode may 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 due to a power supply loss.
Configuring a power cap
To configure power capping for the HP Moonshot System, use the HP Moonshot iLO Chassis Management
Firmware. The iLO CM firmware is a single point of access for chassis management for the HP Moonshot
1500 Chassis. For more information, see the HP Moonshot iLO Chassis Management User Guide on the HP
website (http://www.hp.com/go/moonshot/docs).
Setting the chassis power cap mode using iLO CM firmware
To set the power cap:
1. Log in to the iLO CM firmware (on page 40).
2. Enter the following command to review the current power capacity mode for the chassis:
show chassis power