
Different Metrics for Different Audiences 103
Table 5.1 Some Power, Cooling, Floor Space, and Environmental or IT-Related
Metrics
Term Description Comments
AC Alternating cur-
rent
Type of electivity commonly used for most
electrical or electronic devices.
Amps Watts/volts The flow rate of electricity, e.g., 144 watts/
12 volts = 12 amps.
Annual
kWh
kWh
×
24
×
365 Amount of energy used in kilowatts in 1
year.
Bandwidth Bytes per second How much data is moved in 1 second.
Used for measuring storage system as well
as network data in-flight performance
Btu/hour Watts
×
3.413 Heat generated in 1 hour from using
energy, in British thermal units. 12,000 ...