ProLiant DL360 G2 Server High-Density Deployment

ProLiant DL360 G2 Server High-Density Deployment 14
Table 8. Example De-rating Worksheet (continued)
Maximum Rated Input Power (in watts) for the base configuration Typical Power 146 W
4. Add the typical power for the PCI card 9 W
5. Calculate the total power
Typical power for the desired configuration (in watts)
196 W
6. Calculate the thermal dissipation.
Thermal dissipation for the desired configuration (in BTUs)
196 W × 3.41
668 BTUs/hour
Therefore, the new power budget for this configuration is 196 W (compared to the rated 308 W),
and the thermal dissipation is approximately 668 BTUs/hour (compared to the rated 1050
BTUs/hour).
The rated input power for the ProLiant DL360 G2 power supply is 308 W. Therefore, the power
budget for a maximum configuration is 308 W and the thermal dissipation will be approximately
(308*3.41=) 1050 BTUs/hour.
This de-rated input power budget significantly reduces the power and thermal requirements for
highly populated racks. This also reduces the number of PDUs for certain configurations, which
lowers cost and decreases deployment time. Costs for the facility electrical plumbing, data center
floor ventilation, and facility air conditioning installation can be reduced.
IMPORTANT: It is strongly recommended to verify that the de-rated power budget satisfies all
the installation requirements, including future upgrade plans.
Input Power Budget Allocation
This section explains how to allocate the input power budget for each server. This method can be
used when a PDU is to support a known number of ProLiant DL360 G2 servers. It is important to
verify that the calculated power budget allocation will be sufficient to support the worst-case
server configurations that are to be deployed.
The allocated input power for each server is calculated by multiplying the allocated input current
for each server with the line voltage.
Allocated Input Power = Allocated Input Current * Input Line Voltage
Example
Assume a high voltage PDU rated at 24 A is to support 21 servers. Each server can be allocated
1.143 A. If the line voltage is assumed to be at 208 V, then the allocated input power budget for
each server will be (1.143*208) = 238 W.
Since the input power budget of 238 W exceeds the fully configured system measured input
power of 195 W (as shown in Table 6), 21 ProLiant DL360 G2 servers can be supported by a
24 A high-voltage PDU. That means, only two of these PDUs are needed to support 42 servers
in a 42U rack.
Power Distribution Units
Designed for use in high-volume rack deployments, Compaq offers several PDU models ranging
from 16 – 24A, supporting both high-voltage and low-voltage applications. Compaq PDUs are
equipped with circuit breakers to provide short circuit and over current protection.
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