Adiabatic cooling relies on reducing heat through a change in air pressure caused by volume expansion. Adiabatic processes facilitate “free cooling” methods that make efficient use of water and electricity.Overhead chilled air service to the cold aisles and either raised ceilings or chimneys atop the back of the racks can be used to push/pull air through the IT systems. Cold air falls to the floor and warm air rises to the ceiling. Natural convection can be used to move air through a well-designed facility.Practicing either hot or cold aisle containment.Īfter the basic cooling designs are considered, there are a number of cooling options to contend with, including:.Using blanking panels in empty rack spaces to ensure no leakage of cold air directly into the hot aisle.Alternating the direction of equipment to create naturally formed hot aisles and cold aisles.Data center architects must commit to either air or water as the cooling medium of choice and adhere to design basics, such as:
HYPERPLAN DENSE FULL
Having a tall column full of IT gear generating new levels of heat in hyperscale facilities leads to cooling challenges. Current rack power planning finds UPS functionality being distributed across the data center, within the individual IT rack. Hyperscale data center operators paved the way to eliminate the larger UPS systems in modern data center construction. No longer are the large centralized battery banks and distributed UPS (uninterrupted power supply) systems located along the walls of the data center or at the end of a row of IT cabinets sufficient. To support greater rack densities, the devices governing power to the servers and drives must also evolve. National Renewable Energy Laboratory has confirmed this power usage rise, reporting that 30-kilowatt racks are not uncommon today. In fact, whereas per-rack consumption used to be between one and three kilowatts, consumption has now risen to 20 and even 40 kilowatts in a cabinet. With more devices packed into racks comes more power consumption. More servers and hard drives are placed into a single rack than ever before - in a scale-out (more servers) approach rather than a scale-up (mainframe) approach. Server sales to hyperscalers are increasingly captured by “no name” white-box vendors that give them exactly what they want.ĭuring the past 20 years, the data center industry has seen rack-power density go up commensurate with compute and storage densities. For legacy hardware providers this trend portends a narrower customer base with both a higher technical acumen and closer attention to the bottom line. According to the Cisco Global Cloud Index 2015-2020/Synergy Research, by 2020, 47 percent of all servers sold are expected to go to hyperscalers, which deploy distributed computing environments ranging up to tens of thousands of servers.
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