Compaq ProLiant DL320 Ultra-Dense Server Deployment in Compaq Racks

Compaq ProLiant DL320 Ultra-Dense Server Deployment in Compaq Racks 41
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Appendix C – Power and Thermal
Budgeting
All power requirements for ProLiant DL320 servers that are discussed in this document are based
on the input power of the server. Compaq recommends using the maximum rated power supply
input of 200 W when planning power distribution. Derate the input power for any of the
following reasons:
• To minimize the number of PDUs required for each rack
• To match the rack current requirements with the existing circuit breaker capacity
• To match the rack cooling requirements with the existing facility cooling capability
Note: In this document, derating the input power budget means not using the maximum rated
input power values for the power supply. Please verify that the derated power budget satisfies
all the installation requirements including future upgrade plans.
Use either of the following methods to determine lower input power requirement for ProLiant
DL320 servers:
• Use the derated input power. Calculate this value by using the supplied worksheet at the end
of this appendix.
• Use the allocated input power. Calculate this value by dividing the maximum power of a
PDU by the number of servers. This calculated power must be at least 151 W (200 W peak)
to support all the optional components initially released with the ProLiant DL320.
Table 20 demonstrates how calculating the derated input power of the system can significantly
reduce input current and thermal dissipation.
Table 20. Derated current and thermal dissipation for reduced input power assumptions
Input Power Derated Fully Rated
100 W 151 W 200 W
Input Current @110V AC 0.91 A 1.37 A 1.81 A
Input Current @208V AC 0.48 A 0.73 A 0.96 A
Thermal Dissipation 341 BTUs/hour 515 BTUs/hour 682 BTUs/hour
The derated input power values of 100 W and 151 W can be correlated with the measured input
power values for the minimum and maximum configurations of ProLiant DL320 servers and
optional components outlined in this paper. However, the derated input power value must be high
enough to account for any future upgrades.
Carefully derating the input power may satisfy deployment needs and also reduce the number of
PDUs per rack.