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Contents xvii

SPEC Server Power and Performance Examples 110
Server Sleep Mode 111
EPA Metrics 114
SPEC’s Feedback on EPA’s First Draft of the ENERGY STAR for
Servers Specification 114
LEED Green Building Rating System 115
History 115
Benefits and Disadvantages 116
Certification 117
LEED Versions 118
LEED and Carbon Trading 120
Professional Accreditation 121
The Green Grid Data Center Power-Efficiency Metrics:
PUE and DCiE 121
Short-Term Green Grid Approach 122
Long-Term Green Grid Direction 124
Data Center Productivity (DCP) 125 ptg
So—What’s the Future for Green IT
Energy-Use Metrics? 127
Chapter 8 ■ What About Chillers, Cooling Tower Fans, and All That
Cooling Equipment Usually Ignored by IT? 129
Starting with the Data Center Cooling Basics 131
Data Center Stored Energy Including
Stored Cooling 132
Back to the Future—Water-Cooled Servers 134
Strategies for Increasing Data Center
Cooling Efficiency 135
1. Proper Sealing of the Data Center Environment 136
2. Optimizing Air Flow 137
3. Using Economizers to Achieve Free Cooling 139
4. Increasing the Efficiency of Room Air Conditioners 140
5. Deploying Supplemental Cooling 142
Fuel Cells for Data Center Electricity 143
Other Emerging Technologies for Data Centers 143
Chapter Summary and Conclusions 145