Now that summer is in full swing, it's natural for IT shops to be concerned about keeping their data centers cool. But with limited budgets, keeping the data center operating efficiently without blowing the utility bill out of the water can be a challenge.
It turns out there are some simple tools and best practices that IT departments can employ to keep data center temperatures -- and budgets -- under control.
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Mind the gaps
First and foremost, say industry professionals, the journey to data center cooling efficiency starts with an assessment of the physical integrity of the facility. While it seems like an obvious fix, all too often data centers have gaps throughout that allow air to escape and penetrate the facility.
"I've been in data centers that have folding, garage-like doors with 1-inch gaps under them," says Joe Capes, business development director for cooling at Schneider Electric, a global provider of energy management products and services.
In addition to leaky windows and doors, another common drain on cooling efficiency is ventilation or ceiling tiles that have been removed and not replaced. "One of the simplest things to do is properly seal the room," Capes adds, as a means of "preventing any type of penetration of outside air through doorways, windows, and so forth." Brush strips, blanking panels, and even curtains can be deployed to provide what is essentially weather-stripping. Pay particular attention to cable cutouts and the space under CRAC units.
For data centers in locations where humidity is of particular concern, it's critical to ensure that the vapor barrier -- the plastic or metal coating for the walls, ceiling and floors that keeps moisture at bay -- remains intact. Many data centers were designed and built with vapor barriers; over time, as equipment is brought in and moved around, the holes that are punched throughout the facility to accommodate conduits compromise the vapor barrier, thereby allowing humidity in and out.
While a vapor barrier provides some protection against air flow leakage, this is not the primary benefit of keeping the barrier intact. "Depending on how precisely you want to maintain the humidity in your space and not waste a lot of energy to humidify or dehumidify it, the vapor barrier becomes critical," according to Dave Kelly, director of application engineering for the Liebert Precision Cooling products, a business unit of Emerson Network Power.
Monitor and measure
It is tough to make efficiency improvements in data center operations without knowing how equipment is performing and where heat is generated. "In many data centers, there is a lot of legacy equipment that is doing nothing," asserts Don Beaty, president of DLB Associates, an engineering firm in Eatontown, N.J., that designs and builds data centers. As new equipment is installed, Beaty says it's fairly typical for existing equipment to remain on board.
This problem has its roots in the IT/facilities disconnect: IT people tend to keep equipment running out of fear of disrupting mission-critical operations, while staff on the facility side focus on energy issues. By installing monitoring equipment on racks and PDUs to measure the load and power consumption, a data center can then identify any equipment that is running inefficiently in terms of capacity or even unnecessarily in terms of the applications that are on it.
"Let's say five racks that are measured all have utilization down under 50 percent," Beaty says. "This would increase the possibility of considering virtualizing those five racks, or consolidating in another way to reduce power consumption."