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  • C

    CADE (Corporate Average Data center Efficiency)

    CADE (Corporate Average Data center Efficiency) is a metric used to rate the overall energy efficiency of an organization's data centers. CADE was introduced in a joint Uptime Institute and McKinsey report that proposed the metric as a single key performance indicator that could be used to compare the energy consumption of one data center against another. CADE combines measurements of the energy efficiency and utilization of IT equipment and facilities into a single percentage. (Continued...)

  • Calibrated Vectored Cooling (CVC)

    Calibrated Vectored Cooling (CVC) is an air-cooling technology developed by IBM for server systems with high component density.

  • capacity on demand (COD)

    Capacity on demand (COD) is a purchasing option that allows companies to receive equipment with more computer processing, storage, or other capacity than the company needs at the time of purchase, and have that extra capacity remain unused and unpaid for until the company actually requires it.

  • carbon usage effectiveness (CUE)

    Carbon usage effectiveness (CUE) is a metric developed by The Green Grid to help organizations measure the amount of carbon used -- or carbon footprint -- in the daily operations of their data centers.

  • Categories of twisted pair cabling systems

    ANSI/EIA (American National Standards Institute/Electronic Industries Association) Standard 568 is one of several standards that specify "categories" (the singular is commonly referred to as "CAT") of twisted pair cabling systems, such as wires, junctions, and connectors.

  • CEEDA (Certified Energy-Efficient Datacenter Award)

    CEEDA is a data center certification for the efficient use of energy.

  • channel

    In telecommunications in general, a channel is a separate path through which signals can flow. Depending on the context, this term has various meanings.

  • channel extender

    A channel extender is a device used with IBM's S/390 line of computers to increase the maximum communication distances between the S/390 channel-connected mainframe computers, or between an S/390 and peripheral devices such as workstations, printers, and storage devices.

  • chmod (change mode)

    In a UNIX-based operating system, chmod (change mode) is a command used by a file owner or administrator to change the definition of access permissions to a file or set of files.

  • CICS (Customer Information Control System)

    CICS (Customer Information Control System) is an online transaction processing (OLTP) program from IBM that, together with the COBOL programming language, has formed over the past several decades the most common set of tools for building customer transaction applications in the world of large enterprise mainframe computing.

  • Cisco Catalyst Blade Switch 3020

    The Cisco Catalyst Blade Switch 3020 is a switch designed for the Hewlett-Packard (HP) BladeSystem c-Class of blade servers... (Continued)

  • CMDB (configuration management database)

    A configuration management database (CMDB) is a database that contains all relevant information about the hardware and software components used in an organization's IT services and the relationships between those components.

  • colocation marketplace

    A colocation marketplace is an online platform that connects colocation users with managed service providers, IT vendors and potential business partners.

  • compaction

    In a data center, compaction is the reduction or consolidation of hardware to make better use of physical floor space.

  • computer room air conditioning unit (CRAC)

    A computer room air conditioning (CRAC) unit is a device that monitors and maintains the temperature, air distribution and humidity in a network room or data center. CRAC units are replacing air-conditioning units that were used in the past to cool data centers. According to Industrial Market Trends, mainframes and racks of servers can get as hot as a seven-foot tower of powered toaster ovens, so climate control is an important part of the data center's infrastructure.

  • computer room air handler (CRAH)

    A computer room air handler (CRAH) is a device used frequently in data centers to deal with the heat produced by equipment.

  • computer-intensive

    Computer-intensive is a term that applies to any computing application that requires the resources of a lot of computers, such as grid computing.

  • computerized maintenance management system (CMMS)

    A computerized maintenance management system (CMMS) is software that helps operations and maintenance staff identify and track the status of maintenance tasks and availability of replacement parts.

  • converged data center

    A converged data center pre-integrates server, storage and networking hardware with management, hypervisor and operating system platforms, as well as applications and services.

  • COTS (commercial off-the-shelf)

    COTS (commercial off-the-shelf) describes ready-made products that can easily be obtained.

  • COTS, MOTS, GOTS, and NOTS

    COTS, MOTS, GOTS, and NOTS are abbreviations that describe pre-packaged software or hardware purchase alternatives.

  • cow power (biogas)

    Cow power is a term for the conversion of manure to usable energy. The energy produced can supplement the electric power offered by a utility or power a facility, such as a factory or a data center.

  • CRON script

    A CRON script is a list of one or more commands to a computer operating system or application server that are to be executed at a specified time.

  • crontab

    crontab is a UNIX command that creates a table or list of commands, each of which is to be executed by the operating system at a specified time.

  • crossbar latch

    A crossbar latch, also called a molecular crossbar latch, is a nanoscale device with properties similar to those of a conventional silicon transistor, but physically much smaller, having a diameter of approximately 2 nanometers (nm, where 1 nm = 10-9 m).

  • Cygwin

    Cygwin is an open source collection of tools that allows Unix or Linux applications to be compiled and run on a Windows operating system from within a Linux-like interface.

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