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The Greening of IT
xvi How Companies Can Make a Difference for the Environment

Chapter 6 ■ A Most-Significant Step—“Virtualizing” Your
IT Systems 85
The Concepts of Consolidation and Virtualization 87
Consolidation: A Key in Energy Efficiency 88
Virtualization: The Greenest of Technologies 89
Server Virtualization 92
Partitioning 92
Other Virtualization Techniques 92
Storage Virtualization 93
IBM SAN Volume Controller 93
Virtual Tapes 95
Client Virtualization 95
A Further Look at Reasons for
Creating Virtual Servers 97
The Ultimate in Server and Data Storage Virtualization 98
Cloud Computing—The Exciting Future 99 ptg
Cluster Architecture for Virtual Servers 99
VMware Clusters (VMotion) 99
Blade Servers and Virtualization 101
The Benefits of Blades 102
Virtualizing Blade Servers? 103
Business Continuity—Disaster Recovery 103
Combining Blades and Virtualization 104
Impacts of Server Virtualization on Data Storage 105
Infrastructure Options and Plans 106
Storage Management Issues 106
Data Protection 107
Disaster Recovery 107
Server and Storage Virtualization 107
Chapter Summary and Conclusions 108

Chapter 7 ■ The Need for Standard IT Energy-Use Metrics 109
SPEC 110
SPEC Metrics for Virtual Servers 110