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| Air Conditioning airflow efficiency, the amount of heat removed per standard cubic foot of airflow per minute |
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| Cold aisle containment system that directs cooled air from air conditioning equipment to the inlet side of racks in a highly efficient manner |
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| An aisle where rack fronts face into the aisle. Chilled airflow is directed into this aisle so that it can then enter the fronts of the racks in a highly efficient manner. |
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| Cold supply infiltration index, quantifies the amount of hot air mixing with cold inlet air prior to entering the rack |
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| Heating, ventilation and air conditioning system, the set of components used to condition interior air including heating and cooling equipment as well as ducting and related airflow devices |
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| Internet protocol, a communications technology using the internet for communications. |
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| Java virtual machine, Java interpreter. Software that converts the Java intermediate language into executable machine language |
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| Kilovolt amperes = voltage x current (amperage) |
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| Need plus one, a redundancy concept where capacity is configured to include planned capacity plus one additional device to enable continued operations with the failure of one system in the configuration. This presumes immediate detection and remediation of the failed unit. |
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| Power usage effectiveness, a measure of data center energy efficiency calculated by dividing the total data center energy consumption by the energy consumption of the IT computing equipment. This measure is the inverse of DCiE. |
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| Power usage effectiveness, a measure of data center energy efficiency calculated by dividing the total data center energy consumption by the energy consumption of the IT computing equipment. This measure is the inverse of DCiE. |
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| Power usage effectiveness, a measure of data center energy efficiency calculated by dividing the total data center energy consumption by the energy consumption of the IT computing equipment. |
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| Device for holding IT equipment, also called a cabinet |
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| Raised metal floor, an alternate term for the more commonly used term ‘raised floor' |
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| Uninterruptible power supply, device used to supply short-term power to computing equipment for brief outages or until an alternate power source, such as a generator, can begin supplying power. |
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| Rack mount unit, the standardized height of one unit is 1.75" |
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| Robert Sullivan of the Uptime Institute/The design uses air conditioners, fans, and raised floors as a cooling infrastructure and focuses on separation of the inlet cold air and the exhaust hot air. |
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| Virtual machine manager which allows multiple operating systems to share a single hardware host. It controls the host processor and resources, allocating what is needed to each operating system in turn and making sure each guest operating system cannot disrupt the other |
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| In the paravirtual machine model the VMM actually modifies the guest operating system's code |
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| An autonomic computing system would control the functioning of computer applications and systems without input from the user, in the same way that the autonomic nervous system regulates body systems without conscious input from the individual |
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| Blade servers allow more processing power in less rack space, simplifying cabling and reducing power consumption |
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| (online transaction processing) is a class of program that facilitates and manages transaction-oriented applications, typically for data entry and retrieval transactions in a number of industries, including banking, airlines, mailorder, supermarkets, and manufacturers |
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| he air temperature of any environment where computers and related equipment are kept |
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| n building construction, a plenum (pronounced PLEH-nuhm, from Latin meaning full) is a separate space provided for air circulation for heating, ventilation, and air-conditioning (sometimes referred to as HVAC) and typically provided in the space between the structural ceiling and a drop-down ceiling |
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| The Information Technology Infrastructure Library (ITIL) is a globally recognized collection of best practices for information technology (IT) service management.The United Kingdom's Central Computer and Telecommunications Agency (CCTA) created ITIL in response to growing dependence on information technology for meeting business needs and goals. ITIL provides businesses with a customizable framework of best practices to achieve quality service and overcome difficulties associated with the growth of IT systems. Hewlett-Packard Co. and Microsoft are two businesses that use ITIL as part of their own best practices frameworks. |
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| TIA-942 is a standard developed by the Telecommunications Industry Association (TIA) to define guidelines for planning and building data centers, particularly with regard to cabling systems and network design. The standard deals with both copper and fiber optic media. |
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Network architecture
Electrical design
File storage, backup and archiving
System redundancy
Network access control and security
Database management
Web hosting
Application hosting
Content distribution
Environmental control
Protection against physical hazards (fire, flood, windstorm)
Power management |
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| Redundancy is a system design in which a component is duplicated so if it fails there will be a backup. |
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| the most commonly used digital transmission service in the United States, Canada, and Japan. In these countries, it consists of 24 separate channels using pulse code modulation (PCM) signals with time-division multiplexing (TDM) at an overall rate of 1.544 million bits per second (Mbps). T1 lines originally used copper wire but now also include optical and wireless media. A T1 Outstate System has been developed for longer distances between cities. |
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| Pulse code modulation (PCM) is a digital scheme for transmitting analog data |
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| an access point from one place to the rest of the Internet |
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| the International System of Units' (SI) standard unit of power (energy per unit time) |
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| Electrical power is the rate at which electrical energy is converted to another form, such as motion, heat, or an electromagnetic field. |
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1) In a network, latency, a synonym for delay, is an expression of how much time it takes for a packet of data to get from one designated point to another. In some usages (for example, AT&T), latency is measured by sending a packet that is returned to the sender and the round-trip time is considered the latency.
2) In a computer system, latency is often used to mean any delay or waiting that increases real or perceived response time beyond the response time desired. Specific contributors to computer latency include mismatches in data speed between the microprocessor and input/output devices and inadequate data buffers. |
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Dark fiber is optical fiber infrastructure (cabling and repeaters) that is currently in place but is not being used.
Optical fiber conveys information in the form of light pulses so the "dark" means no light pulses are being sent |
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