HP ProLiant SL2500 Scalable System - Manual (Page 40)

Power capping 40
installed), then the HP APM detects this change and invalidates the current power baseline. This invalidation
prevents any new caps from being set, but does not disable any existing caps that are set.
If a baseline has been invalidated due to changing hardware in the HP APM domain, then several options
are available:
• If the change was caused by replacement of equipment (for example, a failed power supply was
removed and a new one inserted) then you could restore the old baseline by resetting the HP APM and
forcing it to re-read and re-compare the existing power baseline from the resident EEPROM.
• Always use the SET POWER BASELINE command to establish a new power baseline when the domain
configuration changes because of one or more of the following changes:
o SL Power Management Controller (SL Chassis) Firmware has been updated.
o Add or remove the power supply.
o Install or uninstall a new server or enclosure.
o Add or remove memory from the tray.
o Add or remove CPU from the tray.
o Add or remove GPU from the tray.
Power capping licensing
All servers that are being power capped must have the iLO Scale Out or iLO Advanced License installed.
Before a power baseline can be established, the HP APM verifies that all the servers housed in an SL
enclosure have the advanced license pack installed. If any resident servers in the enclosure do not have the
iLO\LO100 advanced license, the power baseline process (" Power baseline " on page 41 ), a prerequisite
for power capping for the enclosure, is skipped.
HP APM and HP APM Distribution Module cabling
All supported SL enclosures and servers that are wired to the HP APM through one or more HP APM
Distribution Modules can participate in power capping and monitoring. Separate power cap settings can be
made for as many or as few of the enclosures as desired, but the power baseline process must operate as a
global process that interacts with every supported enclosure that the HP APM is connected to through the HP
APM distribution modules.
Rack level power capping
The rack level power cap is a power cap set at the HP APM level and, despite the name, can encompass a
partial rack, a rack, or multiple racks. These domains are established by the reach of the HP APM and
distribution module connections to the support SL enclosures combined with any optional zone definitions
that may have been created. The term rack level power cap is used generically in this document to refer to
any power cap that has been set at the HP APM level.
The power capping feature has two main processes to it. The first process establishes a power baseline. The
second process sets a power cap against the previously established power baseline.