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1st ed., 6/30/04 - 312579601
660 VM/HSC 6.0 System Programmer’s Guide
frozen panel— A panel to which cartridges cannot
be moved. This restriction includes allocating new
cartridge locations on a panel as a result of:
• a MOVe command, utility, or PGMI request
• cartridge entry into the ACS
• float, scratch dismount, or scratch redistribution
processing.
G
GB— Gigabyte, billion (10
9
) bytes.
GDG— Generation Data Group. An MVS data set
naming convention. Sequence numbers are appended
to the basic data set name to track the generations
created for that data set.
GDG Separation— Occurs when a Generation Data
Group gets separated because the volumes of
different generations reside in different locations.
Usually, all generations of a GDG are mounted on a
single drive to reduce the number of drives needed
for a job.
GTF— Generalized Trace Facility. An MVS facility
used to trace software functions and events.
H
HDA— Head/disk assembly.
Helical— A generic value that can be specified on
the RECtech parameter and includes all helical
transports.
HOSTid— A HOSTid is the host identifier specified
in the HOSTID parameter of the SLILIBRY
LIBGEN macro. The HOSTid is the SMF system
identifier for both JES2 and JES3.
High Watermark Setup (HWS)— In JES3, a
setting specified on the HWSNAME initialization
statement that reduces the number of devices
reserved for a job. JES3 accomplishes this task by
assessing each jobstep to determine the maximum
number of devices needed for each device type and
reserving those devices.
Host Software Component (HSC)— That portion
of the Automated Cartridge System which executes
on host systems attached to an automated library.
This component acts as the interface between the
operating system and the rest of the automated
library.
host system— A data processing system that is used
to prepare programs and the operating environments
for use on another computer or controller.
HSC— See Host Software Component.
HWS— See High Watermark Setup.
I
ICRC— See Improved Cartridge Recording
Capability.
ID— Identifier or identification.
IDAX— Interpreter Dynamic Allocation Exit. This
is a subfunction of the DFSMS/MVS subsystem
request (SSREQ 55) that the MVS JCL Interpreter
and dynamic allocation functions issue for calling
DFSMS ACS routines for management of the data
set requested.
IDRC— Improved Data Recording Capability.
IML— See Initial Microprogram Load.
Improved Cartridge Recording Capability
(ICRC)— An improved data recording mode that,
when enabled, can increase the effective cartridge
data capacity and the effective data rate when
invoked.
index— A function performed by the cartridge
scratch loader that moves cartridges down the input
or output stack one cartridge position. A scratch
loader can perform multiple consecutive indexes.
INISH deck— A set of JES3 initialization
statements.
Initial Microprogram Load (IML)— A process
that activates a machine reset and loads system
programs to prepare a computer system for
operation. Processors having diagnostic programs
activate these programs at IML execution. Devices
running µ-software reload the functional µ-software
usually from a floppy diskette at IML execution.
Initial Program Load (IPL)— A process that
activates a machine reset and loads system programs
to prepare a computer system for operation.
Processors having diagnostic programs activate these