IBM OS/390 User Manual
Storage Management Subsystem (SMS). A
component of MVS/DFP that is used to automate and
centralize the management of storage by providing
the storage administrator with control over data class,
storage class, management class, storage group, and
ACS routine definitions.
component of MVS/DFP that is used to automate and
centralize the management of storage by providing
the storage administrator with control over data class,
storage class, management class, storage group, and
ACS routine definitions.
structured programming. A method for constructing
programs using only hierarchically nested constructs
each having a single entry and a single exit point.
Three types of control flow are used in structured
programming: sequential, conditional, and iterative.
programs using only hierarchically nested constructs
each having a single entry and a single exit point.
Three types of control flow are used in structured
programming: sequential, conditional, and iterative.
sublibrary. In VSE, a subdivision of a library. See
also library.
also library.
subprogram. A program invoked by another
program. Contrast with main program.
program. Contrast with main program.
subroutine. A sequenced set of instructions or
statements that may be used in one or more
computer programs and at one or more points in a
computer program. (3) A group of instructions that
can be part of another routine or can be called by
another program or routine.
statements that may be used in one or more
computer programs and at one or more points in a
computer program. (3) A group of instructions that
can be part of another routine or can be called by
another program or routine.
subsystem. A secondary or subordinate system,
usually capable of operating independently of, or
asynchronously with, a controlling system.
usually capable of operating independently of, or
asynchronously with, a controlling system.
supervisor. The part of a control program that
coordinates the use of resources and maintains the
flow of processing unit operations. See also system
supervisor.
coordinates the use of resources and maintains the
flow of processing unit operations. See also system
supervisor.
symbolic name. In a programming language, a
unique name used to represent an entity such as a
field, file, data structure, or label.
unique name used to represent an entity such as a
field, file, data structure, or label.
syntax. (1) The relationship among characters or
groups of characters, independent of their meanings
or the manner of their interpretation and use. (2) The
rules governing the structure of a language.
groups of characters, independent of their meanings
or the manner of their interpretation and use. (2) The
rules governing the structure of a language.
syntax error. A compile-time error caused by
incorrect syntax. See also semantic error.
incorrect syntax. See also semantic error.
sysplex. A multiple-MVS system environment that
allows MCS consoles or extended MCS consoles to
receive messages and send commands across
systems.
allows MCS consoles or extended MCS consoles to
receive messages and send commands across
systems.
system console. A console, usually equipped with a
keyboard and display screen, that is used by an
operator to control and communicate with a system.
keyboard and display screen, that is used by an
operator to control and communicate with a system.
system date. The date established for the system
when it is started.
when it is started.
system generation (SYSGEN). The process of
selecting optional parts of an operating system and of
creating a particular operating system tailored to the
requirements of a data processing installation.
selecting optional parts of an operating system and of
creating a particular operating system tailored to the
requirements of a data processing installation.
system maintenance. The modification of a system to
correct faults, to improve performance, or to adapt
the system to a changed environment or changed
requirements.
correct faults, to improve performance, or to adapt
the system to a changed environment or changed
requirements.
system management facilities (SMF). See SMF.
system-managed storage. Storage managed by the
Storage Management Subsystem. SMS attempts to
deliver required services for availability, performance,
space, and security to applications. See also DFSMS
environment.
Storage Management Subsystem. SMS attempts to
deliver required services for availability, performance,
space, and security to applications. See also DFSMS
environment.
system-managed volume. A DASD, optical, or tape
volume that belongs to a storage group. Contrast
with DFSMShsm-managed volume and
DFSMSrmm-managed volume.
volume that belongs to a storage group. Contrast
with DFSMShsm-managed volume and
DFSMSrmm-managed volume.
System Modification Program (SMP). A program
used to install software and software changes on MVS
systems.
used to install software and software changes on MVS
systems.
system operator. An operator responsible for
performing system- oriented procedures.
performing system- oriented procedures.
system programmer. A programmer who plans,
generates, maintains, extends, and controls the use of
an operating system with the aim of improving overall
productivity of an installation.
generates, maintains, extends, and controls the use of
an operating system with the aim of improving overall
productivity of an installation.
system resources. Those resources controlled by the
system, such as programs, devices, and storage
areas that are assigned for use in jobs.
system, such as programs, devices, and storage
areas that are assigned for use in jobs.
system software. Software that is part of or made
available with a computer system and that
determines how application programs are run; for
example, an operating system. Contrast with
application software.
available with a computer system and that
determines how application programs are run; for
example, an operating system. Contrast with
application software.
system support. The continued provision of services
and material necessary for the use and improvement
of an implemented system.
and material necessary for the use and improvement
of an implemented system.
SystemPac. A software package consisting of
installed products for a ready-to-IPL system. Some of
the products have been customized in response to
information provided to IBM. A SystemPac can be
used to install an MVS system for the first time or to
replace an existing MVS system.
installed products for a ready-to-IPL system. Some of
the products have been customized in response to
information provided to IBM. A SystemPac can be
used to install an MVS system for the first time or to
replace an existing MVS system.
systems management. Functions in the application
layer related to the management of Open Systems
Interconnection resources and their status across all
layers of the OSI architecture.
layer related to the management of Open Systems
Interconnection resources and their status across all
layers of the OSI architecture.
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VSE to OS/390 Migration Workbook