IBM OS/390 User Manual
GRS. global resource serialization. A component of
MVS/ESA SP used for sharing system resources and
for converting DASD reserve volumes to data set
enqueues.
MVS/ESA SP used for sharing system resources and
for converting DASD reserve volumes to data set
enqueues.
Guest Operating System (GOS). A second operating
system that runs on the primary operating system.
An example the second operating system is VSE
and/or OS/390 and/or TPF etc. running on VM/ESA. In
this example VSE, OS/390, TPF, etc. are referred to as
a second level system or a VSE guest, OS/390 guest,
TPF guest and so on.
system that runs on the primary operating system.
An example the second operating system is VSE
and/or OS/390 and/or TPF etc. running on VM/ESA. In
this example VSE, OS/390, TPF, etc. are referred to as
a second level system or a VSE guest, OS/390 guest,
TPF guest and so on.
Guest Support. A set of functions and services
available on the VM/ESA product that allow other
operating systems such as OS/390, VSE, TPF, VM, and
others to run on the primary host VM/ESA system.
This is also sometimes referred to as
available on the VM/ESA product that allow other
operating systems such as OS/390, VSE, TPF, VM, and
others to run on the primary host VM/ESA system.
This is also sometimes referred to as
″
using VM as a
hypervisor for running other operating systems
″.
H
hardcopy log. In systems with multiple console
support or a graphic console, a permanent record of
system activity.
support or a graphic console, a permanent record of
system activity.
HCD. Hardware Configuration Definition. An
interactive interface in MVS and OS/390 that enables
an installation to define hardware configurations from
a single point of control.
interactive interface in MVS and OS/390 that enables
an installation to define hardware configurations from
a single point of control.
HFS data set. hierarchical file system data set. A
data set that contains a POSIX-compliant hierarchical
file system, which is a collection of files and
directories organized in a hierarchical structure, that
can be accessed using the OpenEdition MVS facilities.
data set that contains a POSIX-compliant hierarchical
file system, which is a collection of files and
directories organized in a hierarchical structure, that
can be accessed using the OpenEdition MVS facilities.
high-level language (HLL). A programming language
whose concepts and structures are convenient for
human reasoning; for example, Pascal. High-level
languages are independent of the structures of
computers and operating systems.
whose concepts and structures are convenient for
human reasoning; for example, Pascal. High-level
languages are independent of the structures of
computers and operating systems.
HMC . Hardware Management Console A console
used to monitor and control hardware such as the
System/390 microprocessors.
used to monitor and control hardware such as the
System/390 microprocessors.
host system. (1) A data processing system used to
prepare programs and operating environments for
use on another computer or controller. (2) The data
processing system to which a network is connected
and with which the system can communicate.
prepare programs and operating environments for
use on another computer or controller. (2) The data
processing system to which a network is connected
and with which the system can communicate.
I
I/O area. An area of storage that contains data which
is used in input/output operations; for example, an I/O
buffer.
is used in input/output operations; for example, an I/O
buffer.
ICCF. See Interactive Computing Control Facility.
ICKDSF. See Device Support Facilities.
IDCAMS. Utility program name for Access Method
Services (AMS).
Services (AMS).
IMS/VS. See Information Management
System/Virtual Storage.
System/Virtual Storage.
Information Management System/Virtual Storage
(IMS/VS). A data base/data communication (DB/DC)
system capable of managing complex data bases and
networks
(IMS/VS). A data base/data communication (DB/DC)
system capable of managing complex data bases and
networks
information processing. The systematic performance
of operations on information in conjunction with a
computer system to obtain, manipulate, duplicate,
exchange, or communicate its meaning; for example,
file management, word processing, document
interchange, facsimile, videotext.
of operations on information in conjunction with a
computer system to obtain, manipulate, duplicate,
exchange, or communicate its meaning; for example,
file management, word processing, document
interchange, facsimile, videotext.
Information/Management. A feature of the
Information/System licensed program that provides
interactive systems management applications for
problem, change, and configuration management.
Information/System licensed program that provides
interactive systems management applications for
problem, change, and configuration management.
Information/System. In the NetView program, an
interactive retrieval program with related utilities
designed to provide systems programmers with
keyword access to selected technical information
contained in either of its companion products,
Information/MVS or Information/VM-VSE.
interactive retrieval program with related utilities
designed to provide systems programmers with
keyword access to selected technical information
contained in either of its companion products,
Information/MVS or Information/VM-VSE.
initiator/terminator. The job scheduler function that
selects jobs and job steps to be executed, allocates
input/output devices for them, places them under task
control, and at completion of the job, supplies control
information for writing job output on a system output
unit.
selects jobs and job steps to be executed, allocates
input/output devices for them, places them under task
control, and at completion of the job, supplies control
information for writing job output on a system output
unit.
input data set. A data set that contains data to be
processed.
processed.
input file. A file that has been opened in order to
allow records to be read. Contrast with output file.
allow records to be read. Contrast with output file.
input/output (I/O). Pertaining to a device, process, or
channel involved in data input, data output, or both.
channel involved in data input, data output, or both.
installation. (1) In system development, preparing
and placing a functional unit in position for use. (2) A
particular computing system, including the work it
does and the people who manage it, operate it, apply
it to problems, service it, and use the results it
produces.
and placing a functional unit in position for use. (2) A
particular computing system, including the work it
does and the people who manage it, operate it, apply
it to problems, service it, and use the results it
produces.
installation exit. The means specifically described in
an IBM software product
an IBM software product
′
s documentation by which an
IBM software product may be modified by a
customer
customer
′
s system programmers to change or extend
the functions of the IBM software product. Such
modifications consist of exit routines written to
replace one or more existing modules of an IBM
software product, or to add one or more modules or
subroutines to an IBM software product, for the
modifications consist of exit routines written to
replace one or more existing modules of an IBM
software product, or to add one or more modules or
subroutines to an IBM software product, for the
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VSE to OS/390 Migration Workbook