Glossary

This glossary contains a list of terms used within the Environmental Record Editing and Printing Program library.

A

AFP

Advanced Function Printing.

B

BPI

Bits per inch.

BTAM

Basic telecommunications access method.

BUFE

Buffer error.

BYTES RD⁄SRCHD

Megabytes read⁄searched.

C

CAT

Channel availability table.

CCF

Channel-check frame.

CCH

Channel-check handler.

CCHCRH

CCH channel reconfiguration hardware.

CCHINC

CCH incomplete record.

CCU

Channel control unit.

CCW

Channel control word.

CDDA

Command data.

CE

IBM customer engineer (changed to IBM service representative).

central processor (CP)

One of the internal processors that is part of a central processing complex.

channel

The physical connector between a processor and an input/output device, usually via a control unit of some kind. In the case of the extended architecture (System 370/XA), the hardware channels are replaced by subchannels, which are capable of dynamic variation controlled by microcode in the processor complex.

While this book refers to "subchannels" when discussing fields in 370XA report output, it uses "channel" in the general sense to mean the connection between controller and device.

channel-check frame (CCF)

The record on the ERDS that EREP uses to format channel-check records from the 303X group of processors.

channel-check handler (CCH)

A S/370 hardware feature that, when a channel error occurs, records information about the error and issues a message to the operator. In VSE, machine check analysis and recording performs a similar function. The records created in both cases are called CCH records.

channel-report word (CRW)

In S/370XA, a part of the channel-subchannel recovery mechanism. It contains information about channel incidents reported through machine checks, specifying the error environment and the severity of the error. MVS/XA builds a CRW record that, in combination with the subchannel logout handler record, replaces the CCH record.

CHK

Check.

CHNL

Channel.

CHP

Channel path ID.

CHPID

Channel path ID.

CHR

Channel reporting (error).

CK

Check.

CKD

Count key data.

CLNACT

Cleaner action.

CMD

Command.

CMND

Command.

CMS

Conversational monitor system.

CNT

Count.

CNTRL

Control.

CNTRLR

Controller.

code

The programming-language instructions that make up a computer program. As a verb, "to code" is the same as "to write code".

COMP

Component.

CONS+UR

Console plus unit record.

controller

A single unit that provides an interface between one or more storage control units and a group of devices. Controllers usually reside within the same unit as the lowest drive addresses.

CORR

Correctable.

COR

Corrected.

CP

Central processor.

CPC

Central processing complex.

CPU serial number

A 6-digit hexadecimal number. The first digit identifies the central processor within the central processing complex. The second digit identifies the plant where the CPU was manufactured. The remaining digits identify the sequence number. For example, 120003 is CP 1 of the third CPC manufactured at plant two.

CRH

Channel reconfiguration hardware.

CRW

Channel-report word.

CSCH

Clear subchannel.

CSECTID

Control section (CSECT) identification.

CSID

Channel set ID.

CSW

Channel status word.

CT

Controller; count.

CTCA

Channel-to-channel adapter.

CTLID

Controller ID.

CTLR

Controller.

CU

Control unit.

CUA

Channel-control unit-device address.

CUD

Control unit detecting (error).

CUR

Control unit reporting (error).

D

DATAXFR

Data transfer.

DATA CKS CORR/RTRY

Data checks correctable/retry.

DCB

Data control block.

DCI

Dedicated connection interface.

DDR

Dynamic device reconfiguration.

DDROPR

DDR operator requested.

DDRSYS

DDR system requested.

DEV

Device number.

DEVNO

Device number.

DEVNUM

Device number.

DEVT

Device type.

DLBL

DASD label.

DNO

Device number.

DOS (VS)

Disk Operating System. An obsolete name, replaced by VSE, Virtual Storage Extended. In this book, "VSE" includes and implies all releases of this operating system, from DOS to VSE/ESA.

DPA

Dynamic pathing availability.

DRCT

Storage director.

DTE

Date.

dynamic device reconfiguration

A facility that allows a demountable volume to be moved, and repositioned if necessary, without abnormally terminating the job or repeating the IPL procedure. The MVS operating systems create DDR records to provide information about operator-assisted recovery involving the relocation of tape and movable DASD volumes.

E

EBCDIC

Extended binary code decimal interchange code.

ECC

Error correction code.

ECW

Extended control word.

EOD

End of day.

EQUCHK

Equipment check.

EQUIP

Equipment.

ERDS

Error-recording dataset.

EREP

Environmental record editing and printing program.

ERP

Error-recovery program/processing.

ERROPS

Error operations.

error-recovery dataset

Input to the IFCEREP1 program. In MVS systems, the ERDS is SYS1.LOGREC; in VSE systems, it is SYSREC; in VM, it is the error-recording area or cylinders.

error-recovery program/processing

System routines that detect and process errors, writing records to the ERDS.

ERSGAP

Erase gap.

ESIO

I/O devices on ESCON link.

ESW

Extended status word.

EXCP

Execute channel program.

EXTD

External damage.

F

FBA

Fixed block access.

FCF

Function control flag.

FCG

Floating channel group.

FLG

Flag.

FMT

Format.

FRF

Function request flag.

FRR

Function recovery routines.

FTA

File tape adapter.

H

hard machine check or error

A hardware error that disables the processor or other unit.

HDR SER

Header (tape)/serial number of drive that created tape.

HIRS

Hardware instruction retry (successful).

HSCH

Halt subchannel.

I

IC

Incident code.

ICHPT

Installation channel path table.

ID

Identification.

initial program load (IPL)

The process by which an operating system is initialized at the beginning of the day or session. At IPL, the system operator enters the installation-specific information the operating system must have in order to manage the installation’s computing system and handle the installation’s application programs. This information includes system parameters, system dataset definitions, and other information needed so the operating system can begin operating.

installation

A data processing system location; for example, a computer center housing processors, I/O devices, other hardware devices, the software that controls the machines, and the people who control the computer center.

INV

Invalid.

INVK

Invoked.

IOB

Input output block.

IPL

Initial program load.

IRB

Interrupt response block.

J

JCL

Job control language.

JCS

Job control statement.

K

KB

Kilobyte.

L

LEN

Length.

LMAT

Load-module-address table.

LSQA

Local system queue area.

M

machine-check frame (MCF)

The record, on the ERDS, that EREP uses to format machine-check records from the 303X group of processors.

machine-check handler (MCH)

A S/370 hardware feature that analyzes errors and attempts recovery by retrying the failing instruction. If unsuccessful, it causes an interrupt that triggers the creation of an error record. In VSE systems, machine check analysis and recording performs similar functions. The records created in either case are called MCH records.

MB

Megabyte.

MCF

Machine-check frame.

MCH

Machine-check handler.

MCHTRM

MCH System terminated.

MCIC

Machine check interrupt code.

MCK

Machine check.

MDC

Maintenance device code.

MDR

Miscellaneous data record.

MDRDAS

DASD MDR record.

MI

Maintenance information.

MICR

Magnetic ink character recognition.

MIH

Missing-interrupt handler.

miscellaneous data record (MDR)

A record type that records error and usage information from buffered control units or communications controllers, and device failures on TP devices connected to 3705/3725 communications controllers. The record is created when there is an overflow of statistical counters; its purpose is to provide more information about the accompanying failure.

missing-interrupt handler (MIH)

An MVS and MVS/XA facility that keeps track of I/O interrupts, informing the operator and creating a record whenever an expected interrupt fails to occur in a preset time interval.

MIX

The XA version of the missing-interrupt handler.

MOD

Module.

MSHP

Maintain system history program.

MVS, MVS/ESA, MVS/XA

Multiple Virtual Storage, Multiple Virtual Storage/Enterprise Systems Architecture, and Multiple Virtual Storage/Extended Architecture, two versions of the System/370 operating system that are extensions of OS/VS2.

This manual uses "MVS" to refer to a family of operating systems that controls System/370 computing systems. "MVS" includes MVS/370, MVS/XA and MVS/ESA.

N

NCP

Network control program.

network management vector transport (NMVT)

An SNA management services request unit that flows over an active session between a device implementing an SNA physical unit and a device implementing an SNA control point.

NMVT

Network management vector transport.

O

OBR

Outboard recorder.

OBRDMT

OBR demount record.

OBRDPA

OBR dynamic pathing availability.

OBRDPS

OBR dynamic pathing validation analysis.

OBREOD

OBR End-of-day.

OBRPRM

OBR Permanent error record.

OBRPTH

OBR Permanent path error record.

OBRSHT

OBR Short record.

OBRTMP

OBR Temporary error.

OCR

Optical character recognition.

Operating System/Virtual Storage (OS/VS)

A family of operating systems that control IBM System/370 computing systems. OS/VS includes VS2, MVS/370, MVS/XA and MVS/ESA. This book refers to these operating systems by the general term "MVS".

OS/VS

Operating System/Virtual Storage.

OS/VS2

Virtual Storage 2 (MVS, Version 1). MVS/370; one of the MVS operating systems.

outboard recorder (OBR)

In VSE systems, the outboard recorder is a feature that records pertinent data about an unrecoverable I/O error. MVS systems create a similar record from information recorded when an I/O device is in unit-check status. The resulting record in both cases is called an OBR record.

OVERRN

Overrun.

OVERRUN CDDA

Overrun command data.

OVRN

Overrun.

P

PCCA

Physical configuration communications area.

PCT

Product control table.

PCUA

Primary channel-control unit-device address.

PDAR

Program damage assessment and repair.

PERM

Permanent.

PFU

Probable failing unit.

PR/SM

Program resource/system manager.

PRGM INT

Program-initiated.

PRI

Primary.

PRM

Permanent.

product control table (PCT)

The internal table that contains data EREP needs in order to identify and process records from a particular IBM device or product.

PROG-EC

Program-extended control mode.

PSF

Print Services Facility.

PSW

Program status word.

PUB

Physical unit block.

Q

QSAM

Queued sequential access method.

R

RCT

Record control table.

RCVRYXIT

Recovery exit module.

RD

Read error.

RDE

Reliability data extractor.

REC-TYP

Record type.

ROD

Record on demand.

RPA

Return point address.

RSM

Real storage manager.

RTM

Recovery termination manager.

RTN

Routine.

RTRY

Retry.

R/W

Read/write.

S

S/370 and S/370XA

Computing systems built around large IBM processors. XA stands for Extended Architecture, the architecture basis for the 3081 and later processors, characterized by 31-bit addresses. S/370 implies not only the processor but also the many other data processing devices that can be connected to it to make a 370 (or 370XA) data processing system.

SCD

System control data.

SCP

System control program.

SCSW

Subchannel status word.

SCU

Storage control unit.

SCUA

Secondary channel-control unit-device address.

SCUID

Storage control unit ID.

SD

Storage director.

SDR

Statistical data recorder.

SDWA

System diagnostic work area.

SE

Systems Engineer.

SEC

Secondary.

SEEKS CNTR/HH

Seek errors cylinder track/head

SFT

Software record. A record that is produced as part of the system error recovery process. It includes such software-specific information as the ERRORID and the system diagnostic work area control block and its extensions for the failing task or request block. MVS and AIX/ESA ® build software records.

SFTABN

SFT ABEND record.

SFTLST

SFT lost record.

SFTMCH

SFT machine error, recoverable.

SFTPI

SFT program interrupt.

SFTRST

SFT restart.

SIM

Service information messages.

SIO

Start I/O.

SKS

Seeks; data access errors.

SLH

Subchannel-logout handler.

SNA

Systems network architecture.

SNID

Sense path group ID (DPA).

Soft machine check or error

A hardware error that is not disabling.

SPID

Set path group ID (DPA).

SQA

System queue area.

SRC

System reference code.

SRCHD

Searched.

SRF

Service record file.

SSYS ID

Subsystem identifier.

STOR

Storage error.

storage control unit

A functional unit which resides between channels and controllers.

STSCH

Store subchannel.

SSCH

Start subchannel.

subchannel

The extended architecture version of "channel". See also channel.

subchannel-logout handler

A S/370XA feature that provides detailed model-independent information relating to a subchannel; the subchannel logout describes equipment errors detected by the channel subsystem. MVS/XA and MVS/ESA build an SLH record that, in combination with the CRW record, replaces the CCH record.

subsystem

In hardware terms, a group of devices that function together to perform I/O operations. An I/O subsystem can consist of a control unit (controller) and its associated drives—either disk or tape; or it can consist of all the DASD or tape storage—including drives and controllers—in an installation. In the case of newer DASD, the I/O subsystem also includes storage control units and storage directors, within the controller.

SVC

Supervisor call.

syntax

The relationships among the elements and characters in a parameter or language statement. For our purposes, the way you have to code something in order for the program to understand and accept it.

SYSGEN

System generation.

system control program

The minimum software package that will make your operating system work.

system generation

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. Can also include I/OGEN, which is the time when the system programmer defines the installation’s computing system configuration to the operating system.

Systems Engineer

The person responsible for helping you maintain the IBM software in your installation.

T

TCO

Triple capacity option.

TEMP

Temporary.

TERM

Terminal.

TLBL

Tape label.

TMP

Temporary.

TP

Teleprocessing.

TPF

Transaction processing facility.

transaction processing facility (TPF)

A high performance, real-time operating system designed for message-driven applications that require high availability and rapid response time at high message volumes.

TSCH

Test subchannel.

U

UCB

Unit control block.

V

virtual machine (VM)

A time-sharing system control program that manages the resources of an IBM System/370 computing system so that multiple remote terminal users have a functional simulation of the computing system (a virtual machine) at their disposal. This book uses "VM" to mean all versions of the Virtual Machine system control program, including VM/370, VM/System Pro duct, VM/SP/High Performance Option, VM/ESA, and VM/XA.

Virtual Storage Extended (VSE)

A family of disk operating systems that controls IBM System/360 and System/370 computing systems and includes VSE and VSE/Advanced Functions.

VM

Virtual machine.

VOLID

Volume serial number.

VS2

Virtual Storage 2 (MVS, Version 1). MVS/370; one of the OS/VS operating systems.

VSAT

Virtual storage address table.

VSE

Virtual Storage Extended.

VSE/AF

Virtual Storage Extended/Advanced Functions.

W

WRT

Write error.