Power And Thermal Budgeting - HP ProLiant DL380 Technical White Paper

HP ProLiant DL380 Generation 3 Server High-Density Deployment
Power and This section provides the information and worksheets necessary to calculate power and thermal
budgeting for system. However, for the most accurate, updated power and thermal budgeting
Thermal Budgeting
calculations for your particular configuration, HP recommends using the online power calculator.
To use the calculator, visit the Active Answers website:
http://activeanswers.compaq.com/ActiveAnswers/Render/1,1027,1-6-100-225-1,00.htm
Note: In this document, derating the input power budget means not using the maximum rated input power
values for the power supply. HP strongly recommends using the installation planner to ensure that the
derated power budget will satisfy all the installation requirements, including future upgrade plans.
All power requirement discussions in this document are based on the input power of the server, since
this number has direct impact in planning for the PDU selection and the facility power source. One of
the following methods can be used to account for input power in the facility power distribution
planning:
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The power budgets of optional components, referred to in the following sections, were derived from
the system input power of a set of selectively measured server configurations. These configurations
measured range from a basic low-end configuration to a fully populated high-end configuration.
Since the input power values used in an installation might vary depending on the software
applications, the information provided in this section should be used as a guideline only.
The server power supply is designed to support future upgrades of processors, DIMMs, and hard disk
drives. As such, the power supply output power is rated at 400 W. Assuming the power supply
efficiency of 71% (including the Power Factor Correction), the power supply input power is rated
at 565 W. This input power value may be used in planning for the power source implementation
and facility cooling requirements. In some cases, the input power requirement for each server might
be desired to be lower.
The input power requirement might be lowered in the following instances:
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Use the maximum power supply rated input AC power.
Use the derated input power, which can be calculated by subtracting the power budgets of
uninstalled optional components from the rated input power.
Use the allocated input power, which can be calculated by dividing the maximum power of a
PDU by the number of servers. This calculated power should be at least the maximum system
configuration power to support all the optional components initially released with the server.
To minimize the number of PDUs, that is, the number of facility power feed lines, required for
each rack.
To match the rack current requirements with the existing facility branch circuit breakers.
To match the rack cooling requirements with the existing facility environment.
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