HP Integrated Lights-Out - Manual (Page 132)

Using iLO 2 132
An optional setting that enables you to set a cap on a group of servers in an enclosure. Set the cap
between the values shown above the Enclosure Dynamic Power Cap field. These values are based
on the enclosure's current configuration.
As the servers run, the demand for power varies for each server. A power cap for each server is set
to provide the server with enough power to meet its workload demands while still conforming to the
Enclosure Dynamic Power Cap.
You can use either the Static Power Limit or the Enclosure Dynamic Power Cap in the following
situations:
o If the facility power is limited to the enclosure, you can enter a fixed limit into each enclosure. For
example, if the hosted location limits the enclosure to 5000 W. In the limit Enclosure Input Watts
field, enter 5000. The Onboard Administrator limits total power allocation to 5000 W, which
might result in denying power to some of the server blades.
o If the facility limits cooling capacity to the enclosure, then divide the limit of Btu/hr available to
the enclosure by 3.41 to determine the watts limit for that enclosure. Enter that watts limit to
restrict the heat load of the enclosures. For example: If the facility limits individual enclosure to
27,280 Btu/hr, then 27,280 divided by 3.41 yields 8,000 W. Enter the watts limit to restrict
that enclosure to 27,280 Btu/hr. This limit can result in denying power to some of the server
blades.
o If you need to restrict an enclosure's electrical load or thermal output, an Enclosure Dynamic
Power Cap is better. It enables more blades to power on than a Static Power Limit does. A Static
Power Limit is better in the following cases:
— You do not want caps dynamically adjusted on your server blades.
— You prefer to not power on a server blade if it cannot be allocated full power (even if it
typically consumes less).
— More than 1/4 of the blades in the enclosure do not meet hardware or firmware
requirements for the Enclosure Dynamic Power Cap.
— You do not have redundant AC power supplies.
— Do not set a cap on an empty enclosure. This disables both the Static Power Limit and the
Enclosure Dynamic Power Cap.
For more information on Static Power Limit, see the HP BladeSystem Onboard Administrator User
Guide.
iLO 2 Virtual Fan
In c-Class blade servers, the HP Onboard Administrator controls the enclosure fans. The iLO 2 firmware
cannot detect these enclosure fans. Instead, the iLO 2 firmware monitors an ambient temperature sensor
located on the blade server. This information displays on the iLO 2 interface and retrieved by the
Onboard Administrator periodically. The Onboard Administrator uses the sensor information collected
from all iLO 2 management processors in the enclosure to determine enclosure fan speeds.
iLO option
The iLO option of the HP Onboard Administrator allows you to access the iLO 2 Web Administration (on
page 133 ), Integrated Remote Console Fullscreen (on page 89 ), Integrated Remote Console (" Integrated
Remote Console option " on page 89 ), Remote Console, and Remote Serial Console (on page 104 ).