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Several environmental control systems are required to counteract the threats and vulnerabilities discussed in this section When designed and operated properly, these controls will contribute to high reliability and a good service record for IT equipment, which is sensitive to environmental conditions
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Because the quality of commercial utility electric power is usually insufficient for sensitive and critical computing equipment, several additional controls may be needed to improve the quality and/or quantity of available electric power These controls are: Uninterruptible power supply (UPS) This is a system that filters incoming power of spikes and other noise, and supplies power for short periods through a bank of batteries A UPS is sufficient for power outages that last from a few minutes to as long as a few hours (provided there is sufficient battery capacity) A UPS provides a continuous supply of electricity; when there is a brownout or blackout, power delivered to computer systems is unaffected Electric generator This is a system consisting of an internal combustion engine powered by gasoline, diesel fuel, or natural gas that spins an electric generator A generator can supply electricity for as long as several days, depending on the size of its fuel supply and whether it can be refueled Dual power feeds An organization that is especially dependent on reliable electric power can consider using two separate power feeds that would ideally originate from separate utility substations Power distribution unit (PDU) A power distribution unit is a device that distributes electric power to a computer room or data center A PDU may be large and supply dozens of separate power circuits or be as small as a power strip Some PDUs also have voltage step-down capabilities, converting higher-input voltages into voltage levels used by computer equipment These components are depicted in Figure 6-8
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Figure 6-8 Components in a facility power system
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It is important to understand present and future electric power requirements so that the components discussed here can be appropriately sized Some organizations with high reliability requirements may build fully redundant power systems consisting of dual power feeds, dual switchgears, generators, UPSs, and PDUs, delivering fully redundant power to each computer Organizations that utilize redundant power systems usually refer to their power systems as A side and B side systems Computer and network equipment that utilizes dual power supplies can take advantage of redundant power systems by connecting one power supply to the A side and one to the B side This permits systems to continue functioning, even in the event of a complete failure of any single component in the facility s power system
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Because computing and network equipment sheds a large volume of waste heat, highly reliable and adequately sized HVAC (heating, ventilation, and air conditioning) systems are required The temperature in rooms containing computer and network equipment should range from 68 to 75 F, and humidity should range from 40 to 55 percent In facilities with a considerable number of computer systems, this will require highly reliable and high-capacity HVAC systems It is recommended that facilities utilize an N+1 design, which means that there should be at least one additional HVAC system than is required to continuously cool the facility For example, if a facility requires four HVAC systems for cooling, then at least five HVAC systems should be used This permits adequate cooling to continue in the event one system fails or is being maintained
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6: Information Asset Protection
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Computer facilities should employ continuous temperature and humidity monitoring that regularly records readings, and alerts personnel when readings exceed safe levels Sensitive equipment should also have internal temperature monitoring capabilities that alert support personnel when readings exceed tolerance Systems that are sensitive to variations in temperature should have auto-shutdown capabilities in the event that support personnel are unable to respond in time Many computer rooms and data centers employ a raised floor system consisting of removable tiles The space under the tiles acts as an air plenum for air conditioning systems; tiles with holes in them are strategically placed to direct cold air into areas requiring it Tiled floors are typically 80 to 100 cm above the floor beneath
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