Data Center Definitions

This glossary explains the meaning of key words and phrases that information technology (IT) and business professionals use when discussing data centers and related software products. You can find additional definitions by visiting WhatIs.com or using the search box below.

  • G

    GNU Linux

    The GNU Linux project was created for the development of a Unix-like operating system that comes with source code that can be copied, modified, and redistributed... (Continued)

  • green computing

    Green computing is the use of computers and related resources in an environmentally responsible manner. This involves the implementation of energy-efficient central processing units (CPUs), servers and peripherals as well as proper disposal of electronic waste (e-waste)... (Continued)

  • green data center

    A green data center is a repository for the storage, management, and dissemination of data in which the mechanical, lighting, electrical and computer systems are designed for maximum energy efficiency and minimum environmental impact... (Continued)

  • grid computing

    Grid computing uses small, distributed resources from servers and PCs to solve big problems. But will this architecture survive the cloud era?

  • grumble line

    A grumble line is the plotted amount of light from the sky that will be available in a building once an adjacent building has been erected.

  • gzip (GNU zip)

    Gzip (GNU zip) is a free and open source algorithm for file compression. The software is overseen by the GNU project.... (Continued)

  • H

    hard drive overwriter

    In e-cycling, a hard drive overwriter is a program or utility that repeatedly overwrites the data on a computer's hard drive with gibberish.

  • hardware clustering

    Hardware clustering (sometimes called operating system clustering) is a hardware-based method of turning multiple servers into a cluster (a group of servers that acts like a single system).

  • Hardy Heron (Ubuntu 8.04 LTS Server Edition)

    Hardy Heron is the code name for version 8.04 of Ubuntu, the open source Debian -based Linux distribution. Hardy Heron was released in April 2008 and succeeded Gutsy Gibbon. Hardy Heron is widely recognized as one of the most easy-to-use desktop Linux distributions for novice users. (Continued...)

  • Heartbeat

    Heartbeat is a program that runs specialized scripts automatically whenever a system is initialized or rebooted. Originally designed for two-node Linux-based clusters, Heartbeat is extensible to larger configurations... (Continued)

  • high availability (HA)

    In information technology, high availability refers to a system or component that is continuously operational for a desirably long length of time.

  • High Level Assembler (HLASM)

    High Level Assembler (HLASM) is IBM's assembler programming language and the assembler itself for the IBM z/OS, z/VM, OS/390, MVS, VM, and VSE operating systems. Released in June 1992, HLASM was the first new assembler language from IBM in twenty years. Version 4 was released in September 2000.

  • high-performance computing (HPC)

    High-performance computing (HPC) is the use of parallel processing for running advanced application programs efficiently, reliably and quickly. The term applies especially to systems that function above a teraflop or 1012 floating-point operations per second... (Continued)

  • Hot spot/cold spot

    A hot spot/cold spot is an undesirable tightly-focused local temperature variation which often occurs when data center equipment is improperly cooled.

  • hot/cold aisle

    Hot aisle/cold aisle is a layout design for server racks and other computing equipment in a data center. The goal of a hot aisle/cold aisle configuration is to conserve energy and lower cooling costs by managing air flow.

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