Data center systems management Definitions

  • J

    JCL (job control language)

    JCL (job control language) is a language for describing jobs (units of work) to the MVS, OS/390, and VSE operating systems, which run on IBM's S/390 large server (mainframe) computers.

  • job

    In certain computer operating systems, a job is the unit of work that a computer operator gives to the operating system.

  • Job Entry Subsystem (JES)

    Job Entry Subsystem (JES) is a subsystem of the OS/390 and MVS mainframe operating systems that manages 'jobs' (units of work) that the system does. Each job is described to the operating job control language (JCL).

  • job scheduler

    A job scheduler is a program that enables an enterprise to schedule and, in some cases, monitor computer 'batch' jobs (units of work, such as the running of a payroll program).

  • job step

    In certain computer operating systems, a job step is part of a job, a unit of work that a computer operator (or a program called a job scheduler) gives to the operating system.

  • L

    liquid-tight strain-relief connector

    A liquid-tight strain-relief connector is a special electrical connector or jacket used in cabling for electronic and computer systems where water or contaminant intrusion is a concern... (Continued)

  • load bank

    A load bank is a device that generates a prescribed amount of electricity draw to test the reliability of electrical switching, generator output, uninterruptable power supply (UPS) systems and cooling in a data center.

  • M

    moves, adds and changes (MAC)

    Moves, adds and changes (MAC) keep computing equipment in line with user needs and up-to-date, with disciplined process management.

  • MVS (Multiple Virtual Storage)

    MVS (Multiple Virtual Storage) is IBM's best-known operating system for mainframe and large server computers.

  • N

    Net-SNMP (Net Simple Network Management Protocol)

    Net-SNMP is a set of tools and libraries for implementing the Simple Network Management Protocol (SNMP) on enterprise networks.

  • P

    P/390

    The P/390 is basically an IBM mainframe system adapted to run on a personal computer.

  • R

    remote hands

    Remote hands is a service offered by colocation providers that allows customers to delegate management tasks to a technician hired by the provider.

  • Remote Job Entry (RJE)

    Remote Job Entry (RJE) is a facility that allows remote computer users to submit a job (the running of a specific program or group of programs) to a centrally-located IBM mainframe computer.

  • S

    server consolidation

    Server consolidation is an approach to the efficient usage of computer server resources in order to reduce the total number of servers or server locations that an organization requires.

  • server sprawl

    Server sprawl is a situation in which multiple, under-utilized servers take up more space and consume more resources than can be justified by their workload.

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