Opinion: Green In and Out

Computerworld - There are two kinds of people: optimists and pessimists. Sadly, Im one of the latter. So I wasnt surprised when the vast majority of scientists concluded that human contributions to the buildup of greenhouse gases are a key component of global warming.

I sometimes wonder, Whats the use? After all, China and India are just getting started as major producers of greenhouse gases, and the U.S. government seems unwilling to lead this nation in efforts to conserve energy. The future looks very bleak.

Unless you talk to the right optimists.

I recently had the privilege of chatting with John Engates, chief technology officer at Rackspace Managed Hosting in San Antonio. His company has eight global data centers running more than 30,000 servers for 10,000 customers, primarily small and midsize companies. Engates is not only an optimist, but hes also someone with the authority to make changes in how his company consumes energy within its core business operations  the data center.

Naturally, Rackspace is already doing a lot of the things that experts say can cut energy consumption in the data center (see "Seven Steps to a Green Data Center," June 25, 2007). Like many organizations, the company is aggressively pursuing server virtualization. The goal is not only to reduce its server count, but also to get better utilization of system memory, Engates says. As Robert Mitchell pointed out (see "Memory: The New Power Hog," April 30, 2007), RAM power requirements in new servers are double those of CPUs.

As data center managers seek to cut power costs, servers get most of the focus. But Rackspace looks at all the gear it uses. Energy concerns now affect how the company buys and deploys network switches and routers. Engates goal is to reduce unused network ports, which translates into fewer machines and less power used.

Engates emphasizes that thinking green goes beyond looking at what you plug into an electrical socket. You need to look at your entire operation. Because Rackspace buys so many identical servers from the same vendor, it has arranged for the supplier to stop including redundant cables and manuals in each box, so theres less packaging to throw away.

At a more strategic level, Rackspace has committed to using electricity generated from renewable resources. Its new data center in the U.K. will be run completely by biomass- generated power. Its electricity that will be grown instead of mined, Engates says.

For each server Rackspace buys and places in U.S. data centers where renewable energy sources arent available, the company buys offset energy credits from Native Energy LLC in Charlotte, Vt. Native Energy uses that money to develop renewable-energy projects. And Rackspace has joined The Green Grid, a consortium dedicated to cutting data center power consumption.