IBM 3480 Service manual

-_ .. -
----
:: =-= ==
-- ---
.:. ~ .: ':' :.
-.--'-
IBM 3480 Magnetic Tape Subsystem Storage
User's Reference Subsystem
Library
GC35-0099-3

Fourth Edition (November 1987)
This is a revision of and makes obsolete GC35-0099-2.
Changes or additions to the text or illustrations will be indicated
by a vertical line to the left of the change.
References in this publication to IBM products, programs, or
services do not imply that IBM intends to make these available in
all countries in which IBM operates. Any reference to an IBM
licensed
program in this publication is not intended to state or
imply that only IBM's licensed program may be used. Any
functionally equivalent program may be used instead.
Publications are not stocked at the address given below.
Requests for IBM publications should be made to your IBM
representative or to the IBM branch office serving your locality.
A form for
reader's comments is provided at the back of this
publication. If the form has been removed, comments may be
addressed
to IBM Corporation, General Products Division,
Department 61C, Tucson, Arizona, U.S.A. 85744. IBM may use or
distribute whatever information you supply in any way it believes
appropriate without incurring any obligation to you.
© Copyright International Business Machines Corporation 1984,
1986, 1987

Preface
Organization
This manual gives programmers information about using the IBM 3480
Magnetic Tape Subsystem. For complete information about specific macros,
commands,
or functions, consult the other manuals listed in "Related
Publications."
This manual contains the following:
• "Chapter 1. Introduction," gives an overview ofthe IBM 3480 Magnetic
Tape Subsystem and the software requirements for the 3480
• "Chapter 2. Tape Characteristics," describes the format of an IBM
standard data set label
• "Chapter 3. Modifying Existing Code," describes the changes to code
that are needed to use the 3480 including DCB parameters, JCL
changes, and modifications to JFCB
• "Chapter 4. Controlling the I/O Device," describes the changes to the
NOTE, POINT, and DEVTYPE macros, as well as the new SYNCDEV
macro
• "Chapter 5. Displaying Messages," describes the new MSGDISP macro
that allows messages to be displayed to the operator
• "Chapter 6. Managing and Controlling Data Sets," describes the
changes for DFHSM when using the 3480
• "Chapter 7. Recording Error or Statistical Information," describes how
to use the 3480 for the IMS/VS log tape and error and statistical
information
• "Chapter 8. Restrictions to Using Sorting Applications," describes the
restrictions to DFSORT when using the 3480
• "Appendix A. Data Control Block Symbolic Field Names," describes the
control block fields
• "Appendix B. Checkpoint/Restart Codes," shows the return and
completion codes for the IBM 3480 Magnetic Tape Subsystem when
taking a checkpoint.
Preface 111

Prerequisite Knowledge
To use this book effectively, you should already understand data
management procedures.
Related Publications
You may want to reference information presented in the publications listed
below.
IBM 3480 Magnetic Tape Subsystem
• IBM 3480 Magnetic Tape Subsystem Introduction, GA32-0041
• IBM 3480 Magnetic Tape Subsystem Planning and Migration Guide,
GC35-0098
• IBM 3480 Magnetic Tape Subsystem Reference: Channel Commands,
Status and Sense Bytes, and Error Recovery Procedures, GA32-0042
• IBM 3480 Magnetic Tape Subsystem Operator's Guide, GA32-0066
• Care and Handling of the IBM Magnetic Tape Cartridge, GA32-0047
• IBM Input/Output Equipment: Installation Manual-Physical Planning
for System/360, System/370,
and 4300 Processors, TNL GN22-2317 to
GC22-7064
• Tape and Cartridge Requirements for the IBM 3480 Tape Drives,
GA32-0048.
MVS/Extended Architecture
• MVS/Extended Architecture Checkpoint/Restart User's Guide, GC26-4139
• MVS/Extended Architecture System-Data Administration, GC26-4149
• MVS/Extended Architecture Data Administration Guide, GC26-4140
• MVS/Extended Architecture Data Administration: Macro Instruction
Reference, GC26-4141
• MVS/Extended Architecture Magnetic Tape Labels and File Structure
Administration, GC26-4145
• MVS/Extended Architecture Message Library: System Messages,
Volumes 1 and 2, GC28-1376 and GC28-1377
• MVS/Extended Architecture Message Library: System Codes, GC28-1157
IV IBM 3480 Magnetic Tape Subsystem User's Reference

• MVS/Extended Architecture, MVS/System Product-JES3 Version 2,
MVS/System Product-JES2 Version 2, LIC PROG 5665-291, 5740-XC6,
Routing and Descriptor Codes, GC28-1194
• MVS/Extended Architecture Installation: System Generation, GC26-4148
• MVS/Extended Architecture Data Facility Product: General
Information, GC26-4142
• MVS/Extended Architecture Conversion Notebook: MVS/System Product
JES2,
LIC PROG 5740-XC6; MVS/System Product JES3, LIC PROG
5665-291, GC28-1143
• MVS/Extended Architecture, MVS/System Product-JES3 Version 2,
MVS/System Product-JES2 Version 2, LIC PROG 5665-291, 5740-XC6,
Job Control Language, GC28-1148
• MVS/Extended Architecture MVS/System Product Version 2 5665-291
5740-XC6, Initialization and Tuning, GC28-1149
• MVS/Extended Architecture, MVS/System Product Version 2-JES3
MVS/System Product Version 2-JES2, LIC PROG 5665-291, 5740-XC6,
Supervisor Services and Macro Instructions, GC28-1154
• MVS/Extended Architecture MVS/System Product-JES3 Version 2,
MVS/System Product-JES2 Version 2, LIC PROG 5665-291, 5740-XC6,
System Macros and Facilities,
Volumes 1 and 2, GC28-1150 and
GC28-1151
• MVS/Extended Architecture, LIC PROG 5665-291, 5740-XC6, System
Modifications, GC28-1152
• MVS/Extended Architecture, MVS/System Product-JES3 Version 2,
MVS/System Product-JES2 Version 2, 5665-291, 5740-XC6, System
Management Facility, GC28-1153
• MVS/Extended Architecture, MVS/System Product-JES2 Version 2,
5740-XC6 Operations: JES2 Commands, SC23-0064
• MVS/Extended Architecture, MVS/System Product JES2 Version 2, LIC
PROG 5740-XC6, Initialization and Tuning, SC23-0065
• MVS/Extended Architecture, MVS/System Product-JES3 Version 2,
LIC PROG 5665-291, Operations: JES3 Commands, SC23-0063
• MVS/Extended Architecture System, MVS/System Product-JES3
Version 2, LIC PROG 5665-291, Initialization and Tuning, SC23-0059
• MVS/Extended Architecture Debugging, MVS/System Product-JES3
Version 2, MVS/System Product-JES2 Version 2,5665-291, 5740-XC6,
Preface V

MVS/370
Handbook, Volumes 1 through 5, LC28-1l64,1 LC28-1l65, LC28-1l66,
LC28-1l67
and LC28-1l68.
• MVS/370 Data Facility Product, 5665-295, Checkpoint/Restart, GC26-4054
• MVS/370 Data Facility Product, 5665-295, System Generation Reference,
GC26-4063
• MVS/370 Data Facility Product, 5665-295, Data Management Macro
Instructions, GC26-4057
• MVS/370 Data Management Services, Data Facility Product 5665-295,
GC26-4058
• MVS/370 Data Facility Product, 5665-295, Data Management, GC26-4056
• MVS/370 Magnetic Tape Labels and File Structure, 5665-295, GC26-4064
• MVS/370 Message Library: System Messages, Volumes 1 and 2,
GC28-1374 and GC28-1375
• OS/VS Message Library: System Codes, GC38-1008
• OS/VS Message Library: VS2 Routing and Descriptor Codes, GC38·1102
• MVS/370 Installation: System Generation, GC26-4166
• MVS JCL MVS/System Product-JES2 Release 3.3, MVS/System
Product-JES3 Release 3.1, LIC PROG 5740-XYS, -XYN, GC28-1300
• MVS/370 Data Facility Product: General Information, GC26-4160
• OS/VS2 System Programming Library: Debugging Handbook,
MVS/System Products, LIC PROG 5740-XYN, -XYS, Volumes 1 through
3, GC28-1047, GC28-1048, and GC28-1049
• OS/ VS2 MVS Supervisor Services and Macro Instructions, GC28-0683
• OS/ VS2 MVS System Programming Library: Initialization and Tuning
Guide, GC28-0681
• OS/VS2 MVS System Programming Library: Supervisor, GC28-0628
• OS/VS2 MVS System Programming Library: System Management
Facilities, GC28-1030.
All five volumes may be ordered under one order number, LBOF-I015.
VI IBM 3480 Magnetic Tape Subsystem User's Reference

VMjSP and VMjHPO
VSEjSP
• Virtual Machine/System Product Planning Guide and Reference,
SC19-6201
• Virtual Machine/System Product High Performance Option Planning
Guide
and Reference, SC19-6223.
• IBM Virtual Storage Extended/System Package Hardware and Software
Support Extensions, Version 2 Release
1, SC33-6184.
Other Related Publications
• OS/VS Sort/Merge Programmer's Guide Program Product 5740-SM1,
SC33-4035
• Data Facility Hierarchical Storage Manager: Version 2 Release 3.0
Installation and Customization Guide, SH35-0084
• Data Facility Hierarchical Storage Manager: Version 2 Release 3.0
System Programmer's Guide, SH35-0085
• Data Facility Hierarchical Storage Manager: Version 2 Release 3.0
System Programmer's Reference Guide, SH35-0083
• OS/VS2 MVS and Stand-Alone Versions: Input/Output Configuration
Program,
LIC PROG 5740-XYN, -XYS, User's Guide and Reference,
GC28-1027
• Environmental Recording Editing and Printing (EREP) Program,
GC28-1178
• Data Facility/Data Set Services, LIC PROG 5740-UT3, User's Guide and
Reference, SC26-3949
• IBM Input/Output Equipment: Installation Manual-Physical Planning
for System/360, System/370, and
4300 Processors, GC22-7064
• IBM System/370 Installation Manual: Physical Planning, GC22-7004.
Preface Vll

Contents
Chapter 1. The IBM 3480 Magnetic Tape Subsystem ........... 1
IBM
3480 Magnetic Tape Subsystem Operating Mode ............... 2
Conventions Used ........................................... 3
Chapter 2. Tape Characteristics .......................... 5
Changed Format of IBM Standard Data Set Label 2 (HDR2/EOV2/EOF2) 5
Chapter 3. Modifying Existing Code in MVS Systems .......... 7
Selecting Data Set Options .................................... 7
DCB
Parameters .......................................... 7
Coding
the Block Size and Logical Record Length Operands ........ 8
Constructing a Data Control Block ........................... 8
Specifying JCL Options ...................................... 9
Modifying
the Job File Control Block (JFCB) ..................... 9
Setting the Header Label Block ID in the JFCB for High·Speed
Search ................................................ 10
Example of How to Code OPEN(J) ........................... 11
MVS Block Count Checking .................................. 12
User Exits .............................................. 13
EXCP Routines .......................................... 13
User Programs .......................................... 14
Performance Options for IEBGENER ........................... 15
IEBGENER Storage Requirements ........................... 15
Chapter 4. Controlling the 110 Device ..................•.. 17
Controlling High-Speed Search (NOTE/POINT) ................... 17
How the Physical Block Identifier Works ...................... 17
Retrieving the BLOCKID .................................. 17
Performing the High-Speed Search ........................... 18
Comparing
Conventional Search and High-Speed Search .......... 19
Examples of How to Code NOTE and POINT ................... 20
NOTE-Provide Relative Position (BPAM and BSAM) ............ 22
Completion Codes from NOTE .............................. 23
POINT -Moving Tape to a Relative Block Position (BP AM and
BSAM) ............................................... 23
Completion Codes from POINT .............................. 25
Controlling Data Synchronization (SYNCDEV) ................... 25
Example of How to Code SYNCDEV ......................... 27
SYNCDEV-Synchronize Device ............................. 28
SYNCDEV-List Form .................................... 29
SYNCDEV-Execute Form ................................. 30
Completion Codes from SYNCDEV ........................... 31
Obtaining I/O Device Characteristics (DEVTYPE) ................. 32
Contents IX