The U.S. Environmental Protection Agency expects to introduce its first Energy Star rating for servers by year-end, although a more comprehensive system that measures actual workloads will take longer to develop.

The Energy Star program is designed to make it easier for customers to identify the most energy-efficient products on the market. It is already offered for more than 50 kinds of products, including desktop PCs, monitors, ceiling fans and even windows, but the rating system for servers has been much harder to develop.

"This server program is one of the most complicated we've tried to deal with," said Arthur Howard, an associate with ICF International, which provides technical consulting to the EPA for its Energy Star programs.

That's partly because servers are used for so many types of work. Server makers say a benchmark test that measures power efficiency using one type of workload, such as file serving, won't provide meaningful results for customers that use the server for a different task, such as online transaction processing.

The EPA has been gathering input from server makers and other stakeholders for about a year. It quickly determined they would not be able to agree on a way to measure the "useful work" a server can perform with a given amount of power, said Andrew Fanara, who heads the Energy Star product development team.

"We all knew that in the long run, the most intellectually satisfying approach would be to marry energy consumption with work completed, yet admittedly we are not quite there yet in devising that holistic metric," he said in a recent interview.

The EPA hopes to use benchmark tests developed by a nonprofit group called the Standard Performance Evaluation Corp., or SPEC, but so far that group has published only one test for measuring power efficiency, based on a Java workload. It expects to publish several others but has not said when.

The EPA decided to sidestep the issue and come up with an initial, "Tier 1" rating that addresses two key areas it thinks can be measured. One is the efficiency of a server's power supply, which can be measured at various load levels. The other is how much power a server consumes at idle, when it isn't doing any real work.

The EPA will meet with stakeholders at Microsoft's campus in Redmond, Wash., next week to try to hash out definitions for a second draft specification, which could be ready for use by the end of the year, Fanara said. He acknowledged that it will be something of a stop-gap measure.

The IDG News Service is a Network World affiliate.

Whitepapers

• Advancing the Economics of Networking
• Enterprise Data Center Network Reference Architecture
• Implementing HA at the Enterprise Data Center Edge to Connect to a Large Number of Branch Offices
• File Integrity Monitoring: Secure Your Virtual and Physical IT Environments
• 6 Simple Steps to Disaster Recovery Planning
• PRICING STUDY: GROUNDWORK OPEN SOURCE VS. HP SOFTWARE

View more DATA CENTER whitepapers

Webcasts

• PoE Plus: Impact on the PoE Market
• Creating a high performance workplace with wireless networking
• Harnessing the power of communications to increase workplace performance
• Making data centers the IT strategic focus
• Protecting assets and employees with IP Video Surveillance
• Stay out of the headlines: Detecting and preventing network intrusions

View more DATA CENTER webcasts

Special Reports

• IT Buyer's Guide To: Data backup and Replication
• Bringing IT Operations Management to Open Source and Beyond
• Data Centers: At the center of the action
• Executive Guide: Virtualization Reality Check
• Executive Guide: Storage Heats Up
• Get More From Your WAN

View more DATA CENTER special reports