A

ABEND - Abnormal End

ACB - Access control block

ACDS - Active control data set

ADS/O - Application Development System/Online

ADSP - Automatic data set protection

AMS - Access Method Services

AMODE - Addressing mode

APAR - Authorized program analysis report

APF - Authorized Program Facility

API - Application Programming Interface

APPN - Advanced Peer-to-Peer Network

ASCB - Address Space Control Block

ASM - Auxiliary Storage Manager

ASMP - Asymmetric Multi Processing

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B

BAL - Basic Assembler Language

BCP - Base Control Program

BCS - Basic catalog structure

BDAM - Basic Direct Access Method

BDW - Block Descriptor Word

BLKSIZE - Block Size

BLOB - Binary large object

BPAM - Basic Partitioned Access Method

BSAM - Basic Sequential Access Method

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C

CA - Control Area

CBU - Capacity Backup

CI - Control Interval

CICS - Customer Information Control System

CIU - Customer Initiated Upgrade

CKD - Count Key Data

CLIST - Command List

CMS - Conversational Monitor System

COBOL - Common Business Oriented Language

COBOL/SF - COBOL Structuring Facility

CP - Central Processor

CPC - Central Processor Complex

CRM - Customer Relationship Management

CSA - Common service area

CSS IOPQ - Channel Subsystem I/O Priority Queuing

CSS - Channel Subsystem

CSTOR - Central Storage

CTC - Channel to Channel

CU - Control Units

CUA - Control Unit Address

CoD - Capacity on Demand

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D

DA - Device Adapter

DASD - Direct Access Storage Device

DAT - Dynamic Address Translation

DBA - Database Administrator

DBCS - Double Byte Character Set

DBMS - Database management system

DB/DC - Database/Data Communication

DCB - Data Control Block

DCLGEN - Declarations generator

DCM - Dynamic Channel

DD - Data Definition

DFS - Distributed File System

DFSORT - Data Facility Sort

DFSMS - Data Facility Storage Management Subsystem

DOS - Disk Operating System

DL/1 - Data Language / 1

DLL - Dynamic link library

DMA - Direct memory access

DR - Disaster Recovery

DUAS - Dual Address Space

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E

EAV - Extended Address Volume

EBCDIC - Extended binary Coded Decimal Interchange Code

EBN - Extended border node

ECKD - Extended Count Key Data

EFDS - Entry Sequence Data Set

ERP - Enterprise Resource Planning

ESA - Enterprise Systems Architecture

ESCON - Enterprise Systems Connection

ESDS - Entry Sequential Dataset

ESS - Enterprise Storage System

ESTOR - Expanded Storage

ETR - External Time Reference

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F

FDUMP - Formatted Dump

FICON - Fiber Connection

FIFO - First In First Out

FDDI - Fiber Distributed Data Interface

FLPA - Fixed Link Pack Area

FTSS/SE - Field Technical Sales Support/Systems Engineer

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G

GDG - Generation Data Groups

GDPS - Geographically Dispersed Parallel Sysplex

GDS - Generation Data Set

GRS - Global Resource Serialization

GTF - Generalized trace facility

GUI - Graphical user interface

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H

HDA - Head Disk Assembly

HFS - Hierarchical File System

HLASM - High Level Assembler

HLQ - High Level Qualifier

HMC - Hardware Management Console

HSA - Hardware System Area

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I

IMS - Information Management System

IDRC - Improved data recording capability

IOCDS - I/O Control Data Set

IOP - I/O Processors

IPL - Initial Program Load

ISAM - Indexed Sequential Access Method

ISDN - Integrated Services Digital Network

ISMF - Interactive Storage Management Facility

ISO - International Organization for Standardization

ISPF - Interactive System Productivity Facility

ISPF/PDF - ISPF/Program Development Facility

ISV - Independent Software Vender

IVS - Installation verification procedure

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J

JCL - Job Control Language

JES - Job Entry Subsystem

JVM - Java Virtual Machine

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K

KSDS - Keyed Sequence Data Set

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L

LCSS - Logical Channel Subsystems

LDS - Linear Data Set

LPAR - Logical Partition

LRECL - Logical Record Length

LU - Logical Unit

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M

MIPS - Million Instruction Per Second

MLPA - Modified Link Pack Area

MS COBOL - Microsoft COBOL

MTBF - Mean Time Between Failure

MVS - Multiple Virtual Storage

MVS/ESA - Multiple Virtual Storage/Enterprise System Architecture

MVS/SP - Multiple Virtual Storage/System product

MVS/XA - Multiple Virtual Storage/Extended Architecture

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N

NUMA - Non Uniform Memory Access

NCP - Network Control Program

NFS - Network File System

NIP - Nucleus initialization program

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O

ODBC - Open Database Connectivity

OLTP - Online Transaction Processing

OO COBOL - Object Oriented COBOL

OS/VS COBOL - Operating System/Virtual Storage COBOL

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P

PAV - Parallel Access Volume

PCB - Program Control Block

PDF - Portable Document Format, sorry(!) Program Control Facility

PDS - Partitioned Data Set

PDSE - Partitioned Data Set Extended

PDSU - Partitioned Data Set Unloaded

PFA - Predictive Failure Analysis

PLPA - Pageable Link Pack Area

POR - Power On Reset

PSA - Prefix Storage Area

PSA - Prefixed Saved Area

PSW - Program Status Word

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Q

QSAM - Queued Sequential Access Method

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R

RACF - Resource Access Control Facility

RAS - Reliability, Availability, Serviceability

RCT - Region Control Task

RDF - Record Descriptor Field

RDW - Record Descriptor Word

RECFM - Record Format

REXX - Restructured Extended Executor

RISC - Reduced Instruction Set Computer

RMF - Resource Measurement Facility

RMODE - Residency mode

RRDS - Relative Record Data Set

RSM - Real Storage manager

RTM - Recovery Termination Manager

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S

SAP - System Assistance Processor

SBCS - Single Byte Character set

SCB - Status Control Block

SCP - System Control Program

SDSF - System Display and Search Facility

SFM - Sysplex Failure Manager

SIE - Start Interpretive Execution

SIGP - Single Processor

SLA - Service Level Agreement (Batch window defined here)

SMB - Server Message Block

SMF - System management facilities

SMP - Symmetric Multi Processing

SMP/E - System Modification program/Extended

SMS - System Managed Storage / Storage Management Subsystem

SNA - System Network Architecture

SPUFI - SQL Processing Using File Input

SQA - System Queue Area

SQL - Structured Query language

SQLCA - Structured Query language/Control Area

SQLDA - Structured Query language/Data Area

SRB - Service Request Block

SRM - System Resource Manager

STI - Self timed interface

SVC - Supervisor Call

SYSPLEX - System Complex

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T

TCB - Task Control Block

TCP - Transmission Control Protocol

TFS - Temporary File System

TOR - Terminal Owning Region

TPS - Transactions per second

TSO - Time Sharing Option

TSO/E - Time Sharing Option/Extensions

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U

UCB - Unit Control Block

UDB - Universal Database

UIB - User Interface Block

UID - User Identifier

USS - Unix System Services

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V

VOLSER - Volume Serial Number

VM - Virtual Machine

VS COBOL - Virtual COBOL

VSAM - Virtual Storage Access Method

VSCR - Virtual Storage Constraint

VSM - Virtual Storage Manager

VTAM - Virtual Telecommunications Access Method

VTOC - Volume Table of Contents

VVDS - VSAM volume data set

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W

WLM - Workload Manager

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X

XA - Extended Architecture

XREF - Storage cross Reference

XCF - Cross System coupling facility

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Y

Y2K - Year 2000

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Z

z/OS NFS - z/OS Network File System

z/OS MF - z/OS management Facility

z/TPF - Z/Transaction Processing Facility

z/VM - Z/Virtual Machine

z/VSE - Z/Virtual Storage Extended

zAAP - Z/OS Application Assist Processor

zFS - zSeries File System

zIIP - Z/OS Integrated Information Processor