IBM DFSMSdfp Advanced Services
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Below you will find brief information for DFSMSdfp Advanced Services. This manual provides detailed information about how to manage and use the advanced services of DFSMSdfp for efficiently managing data on DASD volumes. It covers various aspects, including the creation and manipulation of Volume Table of Contents (VTOC), managing data sets in the catalog, executing channel programs for direct access, and utilizing system macro instructions to optimize storage allocation and access.
Key Features
VTOC management
Catalog management
Channel program execution
System macro instructions
Data set security
Data set access methods
Data set backup and recovery
Pages: 536 IBM DFSMSdfp Advanced Services User manual
Brand: IBM Category: Software manuals Size: 3 MB
Languages: English
Table of contents
- 3 Contents
- 7 Figures
- 9 Tables
- 11 About This Document
- 11 Required product knowledge
- 11 Referenced documents
- 13 z/OS information
- 13 How to Read Syntax Diagrams
- 15 Address and Register Conventions
- 17 Summary of changes
- 17 Summary of changes for z/OS Version 2 Release 3 (V2R3)
- 17 Summary of changes for z/OS Version 2 Release 2 (V2R2)
- 18 z/OS Version 2 Release 1 summary of changes
- 19 How to send your comments to IBM
- 19 If you have a technical problem
- 21 Chapter 1. Using the Volume Table of Contents
- 21 VTOC Components
- 22 Data Set Control Block (DSCB) Types
- 24 Format-0 DSCB
- 25 Format-1 and Format-8 DSCBs
- 30 Format-2 DSCB
- 31 Format-3 DSCB
- 31 Format-4 DSCB
- 34 Format-5 DSCB
- 34 Format-7 DSCB
- 35 Format-9 DSCB
- 36 Allocating and Releasing DASD Space
- 37 The VTOC Index
- 38 VTOC Index Records
- 38 VTOC Index Entry Record
- 39 VTOC Pack Space Map
- 39 VTOC Index Map
- 39 VTOC map of DSCBs
- 39 Structure of an Indexed VTOC
- 39 Accessing the VTOC with DADSM Macros
- 40 Requesting DASD Volume Information Using LSPACE
- 41 LSPACE—Standard Form
- 43 LSPACE-Execute Form
- 47 LSPACE—List Form
- 49 LSPACE–DSECT Form
- 52 Return Codes from LSPACE
- 53 LSPACE Information Return Areas
- 57 LSPACE Examples
- 57 Reading DSCBs from the VTOC Using OBTAIN
- 57 Reading a DSCB by Data Set Name
- 60 Return Codes from OBTAIN (Reading by Data Set Name)
- 60 Reading a DSCB by Absolute Device Address
- 62 Return Codes from OBTAIN (Reading by Absolute Device Address)
- 63 Releasing Unused Space from a DASD Data Set Using PARTREL
- 63 The PARTREL Macro
- 64 PARTREL–Execute Form
- 66 PARTREL—List Form
- 67 PARTREL–DSECT Form
- 68 Return Codes From PARTREL
- 69 Creating (Allocating) a DASD Data Set Using REALLOC
- 71 REALLOC–Execute Form
- 74 REALLOC–List Form
- 74 REALLOC–DSECT Form
- 74 REALLOC Parameter List
- 75 Return Codes from REALLOC
- 77 Accessing the VTOC with CVAF Macros
- 77 Serializing and Updating
- 78 Identifying the Volume
- 79 Generating a CVPL (CVAF Parameter List)
- 81 Using Buffer Lists
- 82 Buffer List Header
- 82 Buffer List Entry
- 83 Using Macro ICVEDT02 to Map the Extents Area
- 84 Accessing the DSCB Directly
- 84 Specifying a Data Set Name to Read or Write a DSCB
- 85 Specifying the DSCB Location
- 86 Releasing Buffers and Buffer Lists Obtained by CVAF
- 86 Accessing DSNs or DSCBs in Sequential Order
- 87 Initiating Indexed Access (DSN Order)
- 87 Initiating Physical-Sequential Access
- 88 Reading Sets of DSCBs with CVAF Filter
- 89 RESUME Capability
- 90 Filter Criteria List (FCL)
- 93 Example of CVAFFILT Macro Sequences
- 95 Coding CVAF VTOC Access Macros
- 95 CVAFDIR Macro Overview and Specification
- 96 ACCESS: Read or Write a DSCB or VIRs, or Release Buffer Lists
- 97 DSN: Specify the Name of the DSCB
- 97 BUFLIST: Specify One or More Buffer Lists
- 97 VALIDATE: Validate Modified fields in a DSCB
- 97 VERIFY: Verify that a DSCB is a Format-0 DSCB
- 98 UCB or DEB: Specify the VTOC to Be Accessed
- 98 IOAREA: Keep or Free the I/O Work Area
- 99 MAPRCDS: Keep or Free MAPRCDS Buffer List and Buffers
- 99 IXRCDS: Retain VIERS in Virtual Storage
- 100 BRANCH: Specify the Entry to the Macro
- 101 EADSCB: Specify the support level for extended attribute DSCBs
- 101 MULTIPLEDSCBS: Specify whether multiple DSCBs should be processed
- 102 MF: Specify the Form of the Macro
- 102 Return Codes from CVAFDIR
- 102 Example of Using the CVAFDIR Macro with a VTOC
- 104 Example of Using the CVAFDIR Macro with an Indexed VTOC
- 106 Example of Using the CVAFDIR macro to read multiple DSCBs
- 115 CVAFDSM Macro Overview and Specification
- 115 ACCESS: Request Information from Index Space Maps or the VTOC
- 116 MAP: Identify the Map to Be Accessed
- 116 EXTENTS: Storage Area Where Extents Are Returned
- 117 RTA4BYTE: Specify the Type of Extent Area Used
- 118 MAPRCDS: Keep or Free MAPRCDS Buffer List and Buffers
- 118 UCB or DEB: Specify the VTOC to Be Accessed
- 119 COUNT: Obtain a Count of Unallocated DSCBs or VIRs
- 119 CTAREA: Supply a Field to Contain the Number of Format-0 DSCBs
- 119 HADSCB: Supply a Field to Contain the CCHHR of the Highest Allocated DSCB
- 119 IOAREA: Keep or Free the I/O Work Area
- 120 BRANCH: Specify the Entry to the Macro
- 120 EADSCB: Specify the support level for extended attribute DSCBs
- 121 MF: Specify the Form of the Macro
- 121 Return Codes from CVAFDSM
- 121 CVAFFILT Macro Overview and Specification
- 122 Control Block Address Resolution: Keyword=addr or (reg)
- 123 ACCESS: Retrieve a DSCB, or Release FLTAREA and/or IOAREA
- 123 BUFLIST: Specify a Buffer List
- 124 UCB or DEB: Specify the VTOC to Be Accessed
- 124 FCL: Specify a Filter Criteria List
- 124 FLTAREA: Keep or Free the Filter Save Area
- 125 IOAREA: Keep or Free the I/O Work Area
- 125 BRANCH: Specify the Entry to the Macro
- 125 EADSCB=value: Specify the support level for extended attribute DSCBs.
- 126 MF: Specify the Form of the Macro
- 126 Return Codes from CVAFFILT
- 127 Partially-Qualified Names for CVAFFILT
- 127 Example of Using the CVAFFILT Macro
- 141 CVAFSEQ Macro Overview and Specification
- 142 ACCESS: Specify Relationship between Supplied and Returned DSN
- 142 BUFLIST: Specify One or More Buffer Lists
- 142 DSN: Specify Access by DSN Order or by Physical-Sequential Order
- 143 UCB or DEB: Specify the VTOC to Be Accessed
- 143 DSNONLY: Specify That Only the Data Set Name Is Read
- 143 ARG: Specify Where the Argument of the DSCB Is to Be Returned
- 144 IOAREA: Keep or Free the I/O Work Area
- 144 IXRCDS: Retain VIERs in Virtual Storage
- 145 BRANCH: Specify the Entry to the Macro
- 145 EADSCB=value: Specify the support level for extended attribute DSCBs.
- 146 MF: Specify the Form of the Macro
- 146 Return Codes from CVAFSEQ
- 147 Example of using the CVAFSEQ macro with an indexed VTOC
- 149 Example of using the CVAFSEQ macro to process a volume in physical sequential order
- 159 CVAFTST Macro Overview and Specification
- 160 UCB: Specify the VTOC to Be Tested
- 160 Return Codes from CVAFTST
- 160 VTOC Index Error Message and Associated Codes
- 160 Error Message
- 161 Codes Put in the CVSTAT Field
- 161 VTOC Error Responses
- 161 Recovering from System or User Errors
- 162 GTF Trace
- 162 VTOC and VTOC Index Listings
- 163 Chapter 2. Managing the Volume Table of Contents
- 163 Creating the VTOC and VTOC Index
- 163 Protecting the VTOC and VTOC Index
- 163 RACF®
- 163 APF
- 164 Password Protection
- 164 Copying/Restoring/Initializing the VTOC
- 164 Volumes Containing a Nonindexed VTOC
- 164 Volumes Containing an Indexed VTOC
- 165 Deleting a Data Set from the VTOC
- 165 Specifying the Volumes Affected
- 165 Erasing Sensitive Data
- 166 System-Managed-Storage Considerations
- 166 General Considerations and Restrictions
- 167 SCRATCH and CAMLST Macro Specification
- 167 Example
- 168 SCRATCH Parameter List
- 169 Return Codes from SCRATCH
- 170 Status Codes from SCRATCH
- 171 Renaming a Data Set in the VTOC
- 171 Specifying the Volumes Affected
- 171 System-Managed-Storage Considerations
- 171 General Considerations and Restrictions
- 171 Multivolume Considerations
- 172 Unrenamable Data Sets and UNIX Files
- 172 Data Set Security
- 172 Renaming a Data Set That Might be in Use
- 173 RENAME and CAMLST Macro Specification
- 173 Example
- 174 RENAME Parameter List
- 174 Return Codes from RENAME
- 175 Status Codes from RENAME
- 177 Chapter 3. Using Catalog Management Macros
- 177 Application Program Considerations
- 177 Catalog Search Order
- 177 Retrieving Information from a Catalog
- 178 Retrieving Information by Data Set Name (LOCATE and CAMLST NAME)
- 179 Example
- 179 Retrieving Information by Generation Data Set Name (LOCATE and CAMLST NAME)
- 180 Example
- 181 Retrieving Information by Alias (LOCATE and CAMLST NAME)
- 182 Example
- 182 Reading a Block by Relative Block Address (LOCATE and CAMLST BLOCK)
- 182 Return Codes from LOCATE
- 183 Using Non-VSAM Data Set Catalog Entries
- 183 Cataloging a Non-VSAM Data Set (CATALOG and CAMLST CAT)
- 184 Programming Considerations for Multiple-Step Jobs
- 184 Example
- 184 Uncataloging a Non-VSAM Data Set (CATALOG and CAMLST UNCAT)
- 185 Example
- 186 Recataloging a Non-VSAM Data Set (CATALOG and CAMLST RECAT)
- 186 Example
- 187 Return Codes from CATALOG
- 189 Chapter 4. Executing Your Own Channel Programs
- 189 Comparing EXCP and EXCPVR
- 190 Using EXCP and EXCPVR
- 191 Allocating the Data Set or Device
- 192 Opening the Data Set
- 192 Direct Data Set Considerations
- 192 VSAM Data Set Considerations
- 193 Creating the Channel Program
- 193 CCW Channel Program
- 195 zHPF Channel Program
- 196 Comparing CCW and zHPF channel programs
- 197 EXCP 64-bit Storage Considerations
- 197 IDAW Requirements for EXCP Requests
- 198 IDAW Requirements for EXCPVR Requests
- 200 MIDAW Requirements
- 201 TIDAW requirements for EXCP requests
- 201 An EXCP Request with a Single 16K Storage Area
- 201 An EXCP Request with a virtual TIDAL
- 202 Determining Whether zHPF is Supported for a Device
- 203 Modifying a Channel Program During Execution
- 203 VIO Considerations
- 204 Creating the EXCP-Related Control Blocks
- 204 Input/Output Block (IOB)
- 204 Input/Output Block Common Extension (IOBE)
- 204 Event Control Block (ECB)
- 204 Input/Output Error Data Block (IEDB)
- 204 Data Control Block (DCB)
- 205 Data Control Block Extension (DCBE)
- 205 Data Extent Block (DEB)
- 205 Executing the Channel Program
- 205 Using the EXCP macro instruction
- 206 Using the EXCPVR macro instruction
- 207 Initiating the Channel Program
- 207 Translating the Channel Program
- 207 DASD Channel Program Prefix CCW Commands
- 207 DASD Rotational Positioning Sensing
- 208 Command Retry Considerations
- 209 Magnetic Tape Considerations
- 209 Lost Data Condition on IBM 3800
- 209 Processing the I/O Completion Status
- 209 Interruption Handling and Error Recovery Procedures
- 210 Reexecuting Channel Programs by Error Recovery Procedures
- 210 Example
- 211 Requesting Extended Error Information
- 212 Requesting Different Levels of ERP Processing
- 212 VIO considerations
- 212 Invalid ending status
- 213 Device No Longer Supports zHPF or Required zHPF functions
- 213 Handling End of Volume and End-Of-Data-Set Conditions
- 215 Closing the Data Set
- 216 Control Block Fields
- 216 Data Control Block (DCB) Fields
- 219 DCB Fields that do not have Macro Parameters
- 219 Foundation Block Parameters
- 220 EXCP Interface Parameters
- 221 Foundation Block Extension and Common Interface Parameters
- 223 Device-Dependent Parameters
- 227 Mapping the DCB
- 227 Data Control Block Extension (DCBE) Fields
- 228 Set and Retrieve Data Set Block Size
- 229 Input/Output Error Data Block (IEDB) Fields
- 231 Input/Output Block (IOB) Fields
- 234 IOBFLAG3 and IOBCSW Format for Different Channel Program Types
- 236 Input/Output Block Common Extension (IOBE) Fields
- 240 Event Control Block (ECB) Fields
- 242 Data Extent Block (DEB) Fields
- 242 EXCP and EXCPVR Appendages
- 244 Making Appendages Available to the System
- 244 The Authorized Appendage List (IEAAPP00)
- 245 Start-I/O Appendage
- 246 Page Fix and EXCPVR Start I/O Appendage
- 246 PGFX Appendage
- 247 SIO Appendage
- 247 Program-Controlled Interruption Appendage
- 248 End-of-Extent Appendage
- 249 Abnormal-End Appendage
- 251 Channel-End Appendage
- 252 Converting a Relative Track Address to an Actual Track Address
- 254 Return Codes from the Relative to Actual Conversion Routine
- 254 Converting an Actual Track Address to a Relative Track Address
- 255 Return Codes from the Conversion Routine
- 256 Using the IECTRKAD Callable Service or the TRKADDR Macro
- 256 Obtaining the Sector Number of a Block on an RPS Device
- 259 Chapter 5. Using XDAP to Read and Write to Direct Access Devices
- 259 Using XDAP
- 260 Macro Instructions Used with XDAP
- 260 Defining a Data Control Block (DCB)
- 260 Initializing a Data Control Block (OPEN)
- 261 End of Volume (EOV)
- 261 Restoring a Data Control Block (CLOSE)
- 261 Executing Direct Access Programs
- 264 Control Blocks Used with XDAP
- 264 Input/Output Block
- 264 Event Control Block
- 264 Direct Access Channel Program
- 265 RPS Device Sector Numbers
- 267 Chapter 6. Using Password Protected Data Sets
- 268 Providing Data Set Security
- 269 PASSWORD Data Set Characteristics
- 270 Creating Protected Data Sets
- 270 Tape Volumes Containing Multiple Password-protected Data Sets
- 270 Protection Feature Operating Characteristics
- 271 Terminating the Protection Feature Process
- 271 Password Protection When Switching Volumes
- 271 Password Protection When Concatenating Data Sets
- 271 Password Protection SCRATCH and RENAME Functions
- 271 Maintaining the Counter for Password Protection
- 272 Maintaining the PASSWORD Data Set Using PROTECT
- 272 Record Format
- 272 Protection-Mode Indicator
- 273 PROTECT Macro Specification
- 274 PROTECT Macro Parameter Lists
- 277 Return Codes from the PROTECT Macro
- 279 Chapter 7. Using System Macro Instructions
- 279 Ensuring Data Security by Validating the Data Extent Block (DEBCHK macro)
- 280 DEBCHK Macro Specification
- 283 Return Codes from DEBCHK
- 283 Obtaining I/O Device Characteristics (DEVTYPE macro)
- 284 DEVTYPE Macro Specification
- 284 Minimum Type Call
- 284 UCBLIST or INFOLIST Type of Call
- 287 DEVTYPE—Execute Form
- 289 DEVTYPE—List Form
- 290 DEVTYPE—Info Form
- 293 Device Characteristics Information
- 298 DEVTYPE—Return Codes and Reason Codes
- 299 DEVTYPE—Example 1—Referring to a DD Statement
- 299 DEVTYPE—Example 2—Includes Building a Parameter List
- 300 DEVTYPE—Example 3—Building a Parameter List and Using IHADVA
- 301 IHADVA Mapping macro
- 304 Reading and Modifying a Job File Control Block (RDJFCB Macro)
- 307 RDJFCB Macro Specification
- 309 Example
- 310 Type 07 JFCB Exit List Entry
- 313 Type 13 JFCB Exit List Entry
- 319 DEQ at Demount Facility for Tape Volumes
- 321 High-Speed Cartridge Tape Positioning
- 322 OPEN - Initialize Data Control Block for Processing the JFCB
- 324 Purging and Restoring I/O Requests (PURGE and RESTORE macros)
- 324 PURGE Macro Specification
- 326 Return Codes from PURGE
- 326 Modifying the IOB Chain
- 327 RESTORE Macro Specification
- 327 Performing Track Calculations (TRKCALC macro)
- 328 Using TRKCALC
- 328 Determining the number of equal-length records that can be written on a track
- 328 Determining the total track capacity
- 328 Determine whether a record can be written in the space remaining on a track and return the new track balance
- 329 Determine the track balance if the last record were removed from a track
- 329 Determine the length of the longest possible record that can be written on a track
- 329 Restrictions
- 329 TRKCALC Macro Specification
- 329 TRKCALC—Standard Form
- 333 TRKCALC—Execute Form
- 334 TRKCALC—List Form
- 334 TRKCALC—DSECT Only
- 335 Input Register Usage for All Forms of MF
- 335 Output from TRKCALC
- 336 Return Codes from TRKCALC
- 336 TRKCALC Macro Examples
- 337 Perform calculations and conversions with 28-bit cylinder addresses (TRKADDR macro)
- 337 Calculate the relative track number on the volume (TRKADDR ABSTOREL)
- 337 Parameters
- 338 Compare two track addresses (TRKADDR COMPARE)
- 338 Parameters
- 338 Extract 28-bit cylinder number (TRKADDR EXTRACTCYL)
- 338 Parameters
- 339 Extract 4-bit track number (TRKADDR EXTRACTTRK)
- 339 Parameters
- 339 Increment track address (TRKADDR NEXTTRACK)
- 339 Parameters
- 339 Normalize cylinder number (TRKADDR NORMALIZE)
- 340 Parameters
- 340 Convert a relative track number to a 28-bit cylinder address (TRKADDR RELTOABS)
- 340 Parameters
- 340 Set cylinder number from register (TRKADDR SETCYL)
- 341 Parameters
- 341 Convert normalized track address into an absolute 28-bit track address (TRKADDR NORMTOABS)
- 341 Parameters
- 341 Determining Level and Name of DFSMS
- 342 Determining Version, Release, and Modification Level of DFSMS
- 343 Determining Name of DFSMS
- 343 Determining DFARELS During Assembler Macro Phase
- 345 Chapter 8. Displaying Messages on Cartridge Magnetic Tape Subsystems (MSGDISP macro)
- 346 MSGDISP—Displaying a Mount Message
- 348 MSGDISP—Displaying a Verify Message
- 350 MSGDISP—Displaying a Ready Message
- 351 MSGDISP—Displaying a Demount Message
- 354 MSGDISP—Resetting the Message Display
- 356 MSGDISP—Providing the Full Range of Display Options
- 358 Return Codes from MSGDISP
- 361 Chapter 9. Using DFSMSdfp Callable Services
- 362 Call for DFSMS Level Determination
- 362 Format
- 363 Parameters
- 364 Return Codes
- 364 Example
- 365 Call for Data Set Attribute Retrieval
- 366 Format
- 366 Parameters
- 367 Return Codes
- 367 Example
- 367 Call for Data Set Backup-While-Open Support
- 367 Format
- 367 Parameters
- 369 Return Codes
- 369 Example
- 370 Using the Backup-While-Open Facility
- 373 Call for DFSMSdfp Share Attributes
- 373 Format
- 373 Parameters
- 374 Return Codes
- 374 IGWASYS, IGWASMS, IGWABWO, IGWLSHR Return and Reason Codes
- 375 Call for Record-Level Sharing Query (IGWARLS)
- 375 Format
- 376 Parameters
- 377 Return Codes
- 378 Example
- 379 Call for converting and comparing 28-bit cylinder addresses (IECTRKAD)
- 379 Format
- 379 Parameters
- 382 Character Data Representation Architecture (CDRA) APIs
- 383 Chapter 10. Using the DESERV Exit
- 384 Task Level Exit
- 385 Global Exit
- 385 Interactions Between the Task Level and Global Exits
- 386 Establishing Multiple Task level or Multiple Global Exits
- 386 Issuing DESERV FUNC=EXIT (invocation environment)
- 387 Invocation Syntax
- 389 Installing or Replacing the DESERV Exit
- 390 Deleting the DESERV Exit
- 391 Determining If a DESERV Exit Is Active
- 391 Writing the DESERV Exit
- 392 Parameters Related to the GET Function
- 404 Parameters Related to the PUT Function
- 406 PUT Return and Reason Codes
- 409 Parameters Related to the DELETE Function
- 410 Parameters Related to the RENAME Function
- 412 Parameters Related to the UPDATE Function
- 414 Entry Environment for Exit Routine
- 414 Exit Environment for Exit routine
- 415 Registers on Entry to the DESERV Exit
- 415 Registers on Return from the DESERV Exit
- 415 DESERV Exit Return and Reason Codes
- 415 DESERV FUNC=EXIT Return and Reason Codes
- 418 Example of the DESERV Exit
- 425 Chapter 11. Managing Hierarchical File System Data Sets
- 425 Creating Hierarchical File System Data Sets
- 426 Defining the Root File System
- 426 Creating and Mounting the Root File System
- 426 Creating Additional File Systems and Directories
- 427 Adding and Mounting File Systems to the Root File System
- 427 Managing File System Size
- 428 Managing File System Activity
- 428 Accessing HFS Data Set Attributes
- 428 Transporting a File System
- 429 Removing (Deleting) a File System
- 429 Migrating a File System
- 429 Backing Up File Systems
- 430 Recovering a Backed-Up File System
- 430 HFS Deferred File System Synchronization
- 431 How to specify a SYNC value
- 431 Using pfsctl (BPX1PCT) Physical File System Control for HFS
- 432 DisplayBufferLimits Command
- 433 Usage Notes
- 433 ChangeBufferLimits Command
- 433 Usage Notes
- 433 DisplayGlobalStats Command
- 434 Usage Notes
- 434 DisplayFSStats Command
- 434 Usage Notes
- 434 ExtendFS Command
- 434 Usage Notes
- 435 BPX1PCT Return and Reason Codes
- 441 Chapter 12. User Access to Subsystem Statistics, Status, and Counts Information
- 441 Register 1 Parameter List
- 441 Passed Argument List -- SSGARGL
- 463 Appendix A. Control Blocks
- 463 Data Extent Block (DEB) Fields
- 469 Data Facilities Area (DFA) Fields
- 475 Appendix B. Maintaining the System Image Library
- 477 UCS Images in SYS1.IMAGELIB
- 478 Examples of UCS Image Coding
- 482 UCS Image Alias Names
- 482 UCS Image Tables in SYS1.IMAGELIB
- 482 Alias Names in UCS Image Tables
- 486 Adding or Modifying a UCS Image Table Entry
- 488 Adding to the UCS Image Table
- 490 Verifying the UCS Image
- 491 FCB Images in SYS1.IMAGELIB
- 493 Adding an FCB Image to the Image Library
- 495 Modifying an FCB Image
- 496 Return Codes from IMGLIB
- 496 JES Support for the 3211 Indexing Feature
- 499 Appendix C. Using the extended address volume (EAV) migration assistance tracker
- 500 Information conventions for the EAV migration assistance tracker
- 500 Tracking information
- 501 Tracking value
- 501 DFSMS instances tracked by the EAV migration assistance tracker
- 501 LSPACE (SVC 78)
- 502 DEVTYPE (SVC 24)
- 503 IDCAMS LISTDATA PINNED
- 504 IEHLIST LISTVTOC
- 505 IDCAMS DCOLLECT
- 505 IDCAMS LISTCAT
- 506 OBTAIN (SVC 27)
- 507 CVAFDIR
- 508 CVAFSEQ
- 509 CVAFDSM
- 510 CVAFFILT
- 511 CVAFVSM
- 512 DCB Open of a VTOC
- 512 DCB Open of EAS eligible data set
- 513 Other Sample exclusion list
- 513 Recommend exclusion list
- 514 Summary of DFSMS instances
- 515 Appendix D. Accessibility
- 515 Accessibility features
- 515 Consult assistive technologies
- 515 Keyboard navigation of the user interface
- 515 Dotted decimal syntax diagrams
- 519 Notices
- 521 Terms and conditions for product documentation
- 522 IBM Online Privacy Statement
- 522 Policy for unsupported hardware
- 522 Minimum supported hardware
- 523 Trademarks
- 525 Index
- 525 Numerics
- 525 A
- 525 B
- 525 C
- 526 D
- 528 E
- 528 F
- 528 G
- 528 H
- 529 I
- 529 J
- 529 K
- 529 L
- 529 M
- 530 N
- 530 O
- 530 P
- 531 R
- 532 S
- 532 T
- 532 U
- 533 V
- 533 W
- 533 X
- 533 Z
Frequently Answers and Questions
What is DFSMSdfp Advanced Services?
DFSMSdfp Advanced Services is a component of z/OS that provides enhanced capabilities for managing data stored on Direct Access Storage Devices (DASD) volumes. It includes features such as VTOC management, catalog manipulation, channel program execution, and utilization of system macro instructions. These features allow system programmers and applications to interact with DASD volumes at a lower level, optimizing performance and security of data access.
What is VTOC?
The Volume Table of Contents (VTOC) is a crucial data structure on DASD volumes that maintains information about every data set residing on the volume. It helps in locating, accessing, and managing data sets. DFSMSdfp Advanced Services provides various macros and callable services that allow the user to access and manipulate the VTOC.
How can channel programs be executed using DFSMSdfp?
DFSMSdfp Advanced Services provides the EXCP and EXCPVR macros that allow application programs to execute channel programs directly, bypassing the operating system's access method interfaces. This gives more control over data transfer and provides greater efficiency for specialized applications.
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