ISS Technology Update, Volume 6 Number 7 - Newsletter

ISS Technology Update Volume 6, Number 7
8
How to use the data collected from the request output
With the value of electrical current being drawn by each power supply, you can determine the approximate power used by
each power supply with the following equation:
P
n
= V x I
n
Where (n) is the power supply number, (I) is the current, and (V) is always 51.4 volts.
1
P
n
represents the total power
for supply (n).
For this scenario, the approximate power being used by each supply is provided in Table 2-1.
Table 2-1. Power supply information gathered from the sample request output in Figure 2-2
Location Current (I) Voltage Total power for supply (n)
1 14.973 amps 51.4 volts 769.612 watts
2 12.708 amps 51.4 volts 653.191 watts
4 5.353 amps 51.4 volts 275.144 watts
5 8.904 amps 51.4 volts 457.666 watts
With the power value from each power supply, you can approximate the total power for the entire rack with the following
equation:
P
t
= P
1
+ P
2
+ xxx P
n
Where P
t
equals approximate total power.
By entering the total power for each power supply from Table 2-1 into the equation above, you can determine that the total
power for the entire rack in this scenario is 2155.613 watts.
Additional resources
For additional information on the topics discussed in this article, visit the links in Table 2-2.
Table 2-2. Web resources
Resource URL
HP BladeSystem server information and resources www.hp.com/go/blades
HP Lights-Out product information and resources www.hp.com/go/ilo
HP Systems Insight Manager product information and resources www.hp.com/go/hpsim
1
The power supply is rated for 51.4 volts.