Green IT... A concept... a way

Data center energy savings are a huge opportunity. Data centers consume more energy per square foot than any other part of an office building. But they're part of an information and services supply chain that begins with raw materials and ends with the disposal of waste. The chain includes people, the space they occupy, and the cars they drive. Along the way, the chain increasingly gobbles energy and spews greenhouse gases.

Energy consumption in the data center is predominantly from two loads: servers and cooling. Increasing server density compounds the problem. A Gartner poll showed that more than 69 percent of data centers are constrained for power, cooling and space.

Energy-efficient servers are available from the major vendors, most notably Sun's Cool Threads technology that Sun says makes servers more efficient by a factor of five. Efficient processors from IBM, AMD and Intel are making their way into the mainstream, so your favorite server will soon be available in green.

The payoff of efficient servers is twofold. Servers that consume less energy also throw off less heat, requiring less energy for cooling. Alternative approaches, including ice storage and geothermal energy, accept the heat and focus directly on reducing the cost of cooling the data center.

Reducing cooling loads gets the attention of utilities because their summer peak demand periods are caused by air conditioning. Pacific Gas and Electric Company (PG&E), one of the largest natural gas and electric utilities in the United States serving 350,000 California businesses, is offering $1,000 rebates for buying efficient servers that generate less heat.

Outside the data center, PC workstations make a contribution to US companies' power bills. It's not the 100 watts they consume, it's the sheer number of them out there. The Northwest Energy Efficiency Alliance concluded that the average consumption could be shaved by about 25 percent through effective use of power management tools.

The state of the art in this niche is driven primarily by the demand for a set-it-and-forget-it solution. Workers don't want power management to intrude on their day, and IT doesn't want complaints to intrude on theirs. The result is network-based power management software.

Would centralized sleep control be beneficial to your network? One way to find out is to install Verdiem's Surveyor demo without turning it on. Then use the "prediction" function to calculate the potential savings of each profile. Users will be unaffected and unaware of the test, and you'll have a good idea of the effectiveness in your situation.