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DFSMS Using Magnetic Tapes

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DFSMS Using Magnetic Tapes z/OS Version 2 Release 3 DFSMS Using Magnetic Tapes IBM SC23-6858-30 Note Before using this information and the product it supports, read the information in “Notices” on page 139. This edition applies to Version 2 Release 3 of z/OS (5650-ZOS) and to all subsequent releases and modifications until otherwise indicated in new editions. Last updated: 2019-03-01 © Copyright International Business Machines Corporation 1972, 2019. US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp. Contents List of Figures...................................................................................................... vii List of Tables........................................................................................................ ix About this book.................................................................................................... xi Required product knowledge......................................................................................................................xi z/OS information..........................................................................................................................................xi How to send your comments to IBM.....................................................................xiii If you have a technical problem................................................................................................................xiii Summary of changes...........................................................................................xiv Changes for SC23-6858-01 z/OS Version 2 Release 2............................................................................ xiv Changes for SC23-6858-00 z/OS Version 2 Release 1............................................................................ xiv z/OS Version 2 Release 1 summary of changes....................................................................................... xiv Chapter 1. Introduction to tape processing.............................................................1 Describing the labels....................................................................................................................................2 Describing the data sets.............................................................................................................................. 3 Allocating tape data sets........................................................................................................................3 Completing the data control block.........................................................................................................3 Tape information recorded elsewhere...................................................................................................4 Generation data groups..........................................................................................................................5 Concatenated data sets..........................................................................................................................6 Passed data sets.....................................................................................................................................7 Multiple volumes and multiple data sets...............................................................................................7 Processing methods and routines............................................................................................................... 7 Open/Close/End-of-Volume routines.................................................................................................... 8 Checkpoint/Restart routine....................................................................................................................8 Automatic volume recognition............................................................................................................... 9 Tape disposition......................................................................................................................................9 Verifying block count............................................................................................................................10 Bypassing label processing..................................................................................................................10 Tape characteristics...................................................................................................................................11 Nine-track tapes and dual density feature..........................................................................................11 Seven-Track tapes................................................................................................................................12 Tape cartridges.....................................................................................................................................13 Recording technology...........................................................................................................................14 Tape marks........................................................................................................................................... 14 Beginning and End of tape................................................................................................................... 14 Chapter 2. IBM standard labels............................................................................15 Label definitions and organization............................................................................................................ 15 Volume label.........................................................................................................................................18 Data set header labels......................................................................................................................... 18 User header labels............................................................................................................................... 18 Data set Trailer labels...........................................................................................................................18 User Trailer labels.................................................................................................................................18 Additional labels...................................................................................................................................19 System-Managed mountable tape external labels............................................................................. 19 Tape marks........................................................................................................................................... 19 IBM standard labels format.......................................................................................................................19 Format of the IBM standard volume label (VOL1)...............................................................................19 iii Format of IBM standard data set label 1 (HDR1/EOV1/EOF1)........................................................... 21 Format of IBM standard data set label 2 (HDR2/EOV2/EOF2)........................................................... 26 Format of IBM standard user label (UHL1 - UHL8 or UTL1 - UTL8)....................................................33 IBM standard label processing..................................................................................................................35 Creating a volume label............................................................................................................................. 37 IBM standard volume label editor routines.............................................................................................. 38 Protecting data...........................................................................................................................................38 Opening an input data set..........................................................................................................................39 Volume serial number.......................................................................................................................... 40 Positioning the volume to the data set................................................................................................ 40 Processing the HDR1 label...................................................................................................................41 Processing the HDR2 label...................................................................................................................42 User header labels............................................................................................................................... 43 Read backward.....................................................................................................................................43 End-of-Data or end-of-volume on input................................................................................................... 43 Verifying block count in label when reading........................................................................................43 The EOV2/EOF2 label...........................................................................................................................44 User Trailer labels.................................................................................................................................44
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