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118 Sun Fire V100 Server User’s Guide • December 2001
Note – Power from the standby output is available whenever input power is
connected.
Calculating Power Consumption
A Sun Fire V100 server containing two disk drives has an estimated current
requirement of approximately 1 amp.
TABLE A-3 shows the estimated power consumed by the individual components in a
fully powered system. However, when you are calculating the power requirements
for your system, you must allow for 63 percent PSU efficiency. To perform this
calculation, add the figures for each component installed in the system, then divide
the result by 0.63.
Note – To calculate the total power requirement for several servers installed in a
single rack or cabinet, add the individual power requirement figure for each server
installed.
Calculating Heat Dissipation
To calculate the heat generated by a server so that you can estimate the heat your
cooling system must dissipate, convert the figure for the system’s power
requirement from watts to BTU/hr. A general formula for doing this is to multiply
the figure for the power requirement by 3.415.
TABLE A-3 Estimated Power Consumption of Server Components
Component Sun Fire V100
Base system 22.5W
Memory (per DIMM) 4.59W (256 Mbytes, burst mode)
Hard disk drive 6.5W (40 Gbyte/7200 rpm, idle)