Ultra-Dense Server Deployment in Racks

Compaq Ultra-Dense Server Deployment in Compaq Racks 14
128H-0400A-WWEN
2.2 ProLiant DL360 Power and Thermal Budgeting
Note: In this document, de-rating the input power budget means not using the maximum rated input
power values for the power supply. Compaq strongly recommends the installation planner to ensure
that the de-rated power budget will satisfy all the installation requirements, including future
upgrade plans.
All ProLiant DL360 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 the ProLiant DL360 input power in the facility
power distribution planning:
1. Use the maximum rated input power of 292W.
2. Use the de-rated input power, which can be calculated by subtracting the power budgets of uninstalled
optional components from the rated input power.
3. 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 200W, to support all the optional
components initially released with the ProLiant DL360.
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 fully populated high-end configuration. Since the input power
values for a ProLiant DL360 server in an installation might vary depending on the software applications,
the information provided in this section should be use as a guideline only.
The ProLiant DL360 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 190W
. Considering the power
supply efficiency of 65% (including the Power Factor Correction), the power supply input power is rated
at 292W. 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 ProLiant DL360 server
may be desired to be lower than 292W. For example,
• 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.
Table 2-2 demonstrates how significant reduction in input current and thermal dissipation can be realized,
if a deployment plan can limit each ProLiant DL360 configuration over the useful lifetime of a rack
configuration.
Table 2-2. De-rated current and thermal dissipation for reduced input power assumptions
De-Rated Fully Rated
Input Power 100W 200W 292W
Input Current @110V AC 0.91A 1.82A 2.66A
Input Current @208V AC 0.48A 0.96 1.41A
Thermal Dissipation 341 BTUs/hour 682 BTUs/hour 996 BTUs/hour
The de-rated input power values of 100W and 200W can be correlated with the measured input power
values for the minimum and maximum configurations for ProLiant DL360, respectively, considering the
optional components currently offered as illustrated in Section 2.2.2. However, the de-rated input power
value must be high enough to account for any future upgrades for a deployment plan.