Compaq ProLiant DL360 Ultra-Dense Server Deployment in Compaq Racks

Compaq ProLiant DL360 Ultra-Dense Server Deployment in Compaq Racks 21
128H-1100B-WWEN
Adding back 2x128 MB DIMM:
The peak input power of the server will be (219+(2*3)) = 225W. Therefore, the new power
budget for this configuration is 225W (compared to the rated 292W), and the thermal
dissipation will be approximately (225*3.41=) 765 BTUs/hour (compared to the rated 996
BTUs/hour).
This de-rated input power budget significantly reduces the power and thermal requirements for
highly populated racks. This can mean reduced number of PDUs for certain configurations
illustrated in Section 3. Fewer PDUs translates to faster deployment time and lower cost. This can
also mean reduced costs for the facility electrical plumbing, data center floor ventilation, and
facility air conditioning installation. However, care must be taken in de-rating the input power
budget.
Note: Compaq strongly recommends the installation planner to ensure that the de-rated power
budget will satisfy all the installation requirements, including future upgrade plans.
When a subsystem is removed, the typical or the peak power will be subtracted depending on
whether the server input power budget or the thermal dissipation is to be calculated.
2.2.4 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 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 24A is to support 21 servers. Each server can be allocated
1.143A. If the line voltage is assumed to be at 208V then the allocated input power budget for
each server will be (1.143*208) = 238W.
Since the input power budget of 238W satisfies the fully configured system measured input
power of 185W (as shown in Table 2-3), 21 ProLiant DL360 servers may be supported by a 24A
high-voltage PDU. That means, only two of these PDUs are needed to support 42 servers in a
42U rack. This example configuration is further explained in Section 7.1.