HP ProLiant DL170e G6 Server - Manual (Page 40)

Power capping 40
advanced license, the power baseline process (" Power baseline " on page 40 ), a prerequisite for power
capping for the enclosure, is skipped.
The SL-APM has no licensing considerations.
SL-APM and SL-APM Distribution Module cabling
All supported SL enclosures and servers that are wired to the SL-APM through one or more SL-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 SL-APM is connected to through the
SL-APM distribution modules.
Rack level power capping
The rack level power cap is a power cap set at the SL-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 SL-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 SL-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.
Power baseline
The power baseline is a calibration that indicates the range of how little power the chassis can consume at
their maximum allowable power cap and how much power they can consume when completely uncapped.
The minimum value is derived by capping the servers at their maximum internally allowable cap setting,
running the enclosure fans up to 90% of capacity, and then measuring the power consumption of the chassis
at the power supply level.
SL enclosures cannot be power calibrated by the SL-APM if:
• All the servers that populate the chassis do not carry the iLO/LO100 advanced license (empty slots are
permitted).
• The chassis is using incompatible SL Power Management (SL Chassis) enclosure firmware prior to
version 4.3.
• The server or enclosure hardware does not support the power capping feature.
If these checks are met (SL-APM verifies these conditions for each chassis), then the power baseline process
will proceed for that chassis. The baseline calibration process is run against every enclosure connected to the
SL-APM with the exceptions listed previously. Some enclosures might be baselined while others are not due
to the previously listed reasons. After a power baseline is established for all enclosures, then the baseline is
committed to the SL-APM onboard EEPROM so that it becomes persistent when SL-APM is reset during
operation.
NOTE: The power baseline process is required for power capping functionality to work
properly. All servers must be powered on and running an expected typical workload before
starting the power baseline process. Because the baseline process will cap the servers briefly,
performance will be impacted while power is measured and the baseline established.