by clicking on the page. A slider will appear, allowing you to adjust your zoom level. Return to the original size by clicking on the page again.
the page around when zoomed in by dragging it.
the zoom using the slider on the top right.
by clicking on the zoomed-in page.
by entering text in the search field and click on "In This Issue" or "All Issues" to search the current issue or the archive of back issues respectively.
by clicking on thumbnails to select pages, and then press the print button.
this publication and page.
displays a table of sections with thumbnails and descriptions.
displays thumbnails of every page in the issue. Click on a page to jump.
allows you to browse through every available issue.
GCN : November 2013
38 Savvy Power & Cooling Strategies Visit CDWG.com/power-cooling for more resources on power and cooling strategies. overhead conveyance systems. PDUs can be located throughout data center in different zones, providing power to servers, storage and networking devices along with heating and cooling units. UPS systems produce clean power bridging the gap between the time utility-supplied power is disrupted and the time a generator is started. Depending on the size and type of generator, as well as the power management or control system, the generator may: • Start automatically when the control unit detects loss of power • Start within several seconds, including time for power to stabilize for use During the gap between loss of utility power and stable power from the generator, either a battery-powered UPS or a motor generator (whose flywheel continues to rotate from kinetic energy) provides bridge power to keep IT equipment running. Data Center Infrastructure Management (DCIM) software can be extremely valuable in managing the data center cooling to make the most efficient use of the power grid in the facility. Building Roof Power and Networking Cable Conveyance Hot Air Hot Aisle Hot Air Hot Aisle Hot Aisle Raised Floor Cool Aisle Perforated Floor Tile Cool Aisle Perforated Floor Tile Equipment Cabinet Equipment Cabinet Equipment Cabinet Equipment Cabinet Cool Air Cool Air CRAC CRAC COOLING MANAGEMENT cooling. For example, the IT team will want to identify hot spots and cold spots, as well as areas of airflow contention so it can make adjustments. Possible changes might include raising or lowering the temperature in certain sectors, rearranging equipment locations or redesigning exhaust patterns. Cable management and cable conveyance solutions keep cables grouped together to simplify maintenance as well as maintain good airflow. By keeping cables grouped together, underfloor blockage of airflow is minimized, enabling cooling and heating systems to operate more efficiently. e same holds true for cabling within cabinets and equipment racks. Even in this location, organized cabling will result in more efficient cooling. Many new data centers are being built or remodeled with several feet of clearance below the floor, sometimes as much as five or six feet. ese higher raised floors facilitate maintenance, the addition of new cabling and better airflow. In the Cooling Management graphic above, the data center has an exposed ceiling and no overhead return air ducting for heat removal. Hot air is pulled back in from cooling units that produce cool air forced under the raised floor. e cool air under pressure exhausts through perforated floor tiles and is pulled into equipment cabinets arranged in hot and cold aisles. e cold aisle is the cooling row, where equipment intakes face one another in a row, pulling cool air through the perforated floor tiles and exhausting hot air into the hot aisle. In the hot aisles, the exhaust sides of the equipment face one another, with warm air being pulled to the ceiling and back to the cooling units. Also under the raised floor, cable management and cable conveyance systems for networking and electrical power reduce airflow obstructions, reducing the power required to push air throughout the facility. Working with technology suppliers and consultants, airflow and temperature analysis can be performed to assess areas of improvement for optimizing airflow and THE PERCENTAGE OF DATA CENTERS THAT REPORTED UPTIME PROBLEMS DUE TO POWER OR COOLING CONSTRAINTS SOURCE: e Datacenter's Role Delivering Business Innovation: Using DCIM to Provide a Common Management Approach, IDC Global, November 2012 52%