- Measure PUE
- Manage Air Flow
- Adjust Thermostat (run hotter)
- Use Free Cooling (ambient cooling)
- Optimize power distribution
They also recommend the GreenGrid standards for measuring PUE, which is an interesting set of guidelines to consider.
Given that Workday is sharing data centers with other tenants (co-location), we don't have the same degree of choice, but we are working with our data center providers to understand their respective PUE as well as the energy mix going into powering the data center. This gives us a good understanding of how "green" a data center is in the end.