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

• Migrate many applications into fewer images
IT Infrastructure Energy-Efficiency Strategy • Simplify IT environment
• Reduce operations resources
• Improve application-specific monitoring and
• Consolidate from many to • Consolidate many • Remove physical resource tuning
fewer data centers servers into fewer boundaries
on physical
• Reduce infrastructure resource • Increase hardware utilization
complexity boundaries
• Allocate less than physical Application
• Improve facilities • Reduce system boundary Integration
management management
complexity • Reduce software
• Reduce staffing licensing
requirements • Reduce physical costs
footprints Virtualization State-of-
• Improve business the-Art
resilience (manage
fewer things better)
• Integrated
• Improve operational Physical Best power
costs Consolidation management
Practices • Direct liquid
• Hot and cold aisles
cooling
• Improved efficiency
• Combined heat
transformers, UPS, and power
chillers, fans, and
Centralization
Improved pumps
Operations • Free cooling
• Conservation techniques
• Infrastructure energy efficiency
• Improved airflow management
Facility Infrastructure Energy-Efficiency Strategy
Source: IBM Big Green Team ptg
Figure 2.2 An energy-efficiency strategy for facility infrastructures
Software/Applications/Process Workload—
Often-Overlooked Areas for Green IT
Our discussion on green IT has focused on IT equipment and facilities
requirements. This includes the significant energy-efficiency topics such
as virtualization to improve server efficiency, or to power off unused
equipment. However, the software that uses the IT equipment can also
be a significant opportunity for saving energy. Applications require CPU
cycles to execute the millions of instructions needed to complete trans-
actions and units of work. Storage devices for source code, executables,
and the information used and produced as the applications execute all
consume energy and facilities space, and produce e-waste. Although it
might not be immediately obvious, you can take actions to make your
applications greener, reducing both the energy and resources required to
keep your business running.