Compaq ProLiant DL360 Ultra-Dense Server Deployment in Compaq Racks

Compaq ProLiant DL360 Ultra-Dense Server Deployment in Compaq Racks 17
128H-1100B-WWEN
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.
As stated earlier, the power supply is designed to support future processor and hard drive
upgrades. When installing 42 servers, the number of PDUs to be installed will depend on the
support for the input current requirement. Carefully de-rating the input power may very well
satisfy deployment needs and also reduce the number of PDUs per rack. Reducing the number of
PDUs has a direct impact on the deployment time and maintenance of an installation.
The remainder of this section explains the input power relationships to input current and thermal
dissipation to aid customers in de-rating the input power.