The one consensus regarding power management in the data center is that you must measure the current consumption in order to gauge how effective improvements are.
PUE has been discussed a great deal in terms of power efficiency calculations.
An additional calculation for efficiency is CADE (Corporate Average Data center Efficiency).
CADE calculation is determined as follows: CADE = (Facility Efficiency) x (IT Asset Efficiency)
- Facility Efficiency = Energy delivered to IT / energy drawn from utilities
- IT Asset Efficiency = Average CPU utilization across all servers, often a small percentage such as 5%, until efficiency efforts such as virtualization are undertaken.
The paper also discusses the 5 locations for measuring power.
Server Technologies Sentry Power Manager provides a central interface to access multiple network monitored sentry power distribution units to collect power information including kW and kW-hour information for billing, power monitoring, trending and power reports.
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