ABCs of IBM z/OS System Programming Volume 3

1 RedbooksFront coverABCs of IBM z/OS System Programming Volume 3 Jose Gilberto Biondo Technical Support OrganizationABCs of IBM z/OS System Programming Volume 3 January 2018SG24-6983-04 Copyright International Business Machines Corporation 2004, 2018. All rights to Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP ScheduleContract with IBM Edition (January 2018)This edition applies to version 2 release 3 of IBM z/OS (product number 5650-ZOS) and to allsubsequent releases and modifications until otherwise indicated in new editions. Note: Before using this information and the product it supports, read the information in Notices on page ix. Copyright IBM Corp.

2 2004, 2018. All rights .. ixTrademarks ..xPreface .. xiThe team who wrote this book .. xiNow you can become a published author, too! .. xiiComments welcome..xiiStay connected to IBM Redbooks .. xiiiChapter 1. DFSMS introduction.. Introduction to DFSMS .. DFSMS components .. DFSMSdfp base element .. Managing storage .. DFSMSdss optional feature .. DFSMSrmm optional feature.. Library management .. Shelf management .. Volume management .. Data set management.. DFSMShsm optional feature .. Storage and space management .. Tape mount management .. Availability management .. DFSMStvs optional feature .. VSAM record-level sharing .. Recoverable resource management services.

3 8 Chapter 2. Data set basics.. Data sets on storage devices .. Storage devices .. DASD volumes .. Tape volumes .. Data set types .. Non-VSAM data sets .. VSAM data sets .. z/OS UNIX files .. Object data sets .. Other data set attributes .. Data set striping .. Physical sequential and VSAM data sets .. Accessing your data sets .. Accessing cataloged data sets .. Accessing uncataloged data sets .. VTOC and DSCBs .. Data set control block .. VTOC index .. Creating VTOC and VTOC Index .. 22iv ABCs of IBM z/OS System Programming Volume 3 Chapter 3. Extended address volumes.. Traditional DASD capacity .. Serialization granularity.

4 DASD virtual visibility .. Multiple allegiance .. Parallel access Volume .. HyperPAV feature .. Extended access volumes .. 3390 Model A .. EAV volumes architecture.. EAS eligible data sets .. EAS non-eligible data sets .. Dynamic Volume expansion .. EAV and IGDSMSxx parmlib member .. IGDSMSxx USEEAV parm .. IGDSMSxx BreakPointValue.. EATTR attribute .. Migration assistance tracker .. 33 Chapter 4. Storage management software.. Overview of DFSMSdfp utilities.. System utility programs.. Data set utility programs .. DFSMSdfp access methods .. Basic sequential access method.. Basic direct access method .. Basic partitioned access method.

5 Queued sequential access method (QSAM).. Object access method .. Virtual Storage Access Method.. Access method services (IDCAMS) .. Access method services commands.. Starting the IDCAMS utility program .. IDCAMS functional commands .. AMS modal commands .. DFSMS Data Collection Facility (DCOLLECT) .. Generation data group .. Virtual Storage Access Method .. Logical record .. Physical record .. Control interval .. Control area .. Component .. Cluster.. Sphere .. Other VSAM terminologies .. Typical KSDS processing .. Typical ESDS processing .. Typical RRDS processing .. Typical LDS processing .. VSAM: Data-in-virtual .. VSAM resource pool.

6 VSAM: System -managed buffering.. 59 Contents Data set separation .. Data Facility sort .. DFSORT functions .. Data Set Services (DFSMSdss) .. Physical and logical processing .. DFSMSdss stand-alone services .. Hierarchical Storage Manager .. DFSMShsm data sets .. Storage device hierarchy .. Availability management .. Space management .. Removable media manager (DFSMSrmm) .. Resources managed by DFSMSrmm .. Libraries and locations .. Managing data .. 76 Chapter 5. System -managed storage .. DFSMS and storage management .. Managing storage with DFSMS .. Goals and benefits of System -managed storage.. Service level objectives.. SMS configuration.

7 SMS control data sets .. Data sets eligible for SMS management.. Data sets non-eligible for SMS management .. Implementing DFSMS .. DFSMS constructs .. Data class .. Storage class .. Management class .. Storage group .. Using aggregate backup and recovery support .. Automatic class selection routines .. Maintaining and monitoring SMS policies .. Starting SMS .. Activating a new SMS configuration .. Controlling SMS processing using operator commands .. Interactive Storage Management Facility .. ISMF: What you can do with ISMF .. Accessing ISMF .. 102 Chapter 6. Catalogs .. The integrated catalog facility structure .. Basic catalog structure.

8 VSAM Volume data set .. Aliases.. Multilevel aliases .. Catalog search order.. Search order for catalogs for a data set define request .. Search order for locating a data set .. Using multiple catalogs .. Splitting catalogs .. Merging catalogs.. 110vi ABCs of IBM z/OS System Programming Volume Sharing catalogs across systems .. Catalog caching .. In-storage cache .. Catalog data space caching .. Enhanced Catalog Sharing .. VSAM record-level sharing .. Catalog address space .. Maintaining your catalogs .. Listing a catalog .. Backup procedures .. Recovery procedures .. Checking the integrity on an ICF structure .. Catalog performance.

9 Working with the catalog address space.. 118 Chapter 7. DFSMS Transactional VSAM Services .. VSAM record-level sharing introduction .. Supported data set types .. Coupling facility overview .. VSAM RLS sharing control data sets .. Data set sharing under VSAM RLS.. VSAM RLS locking .. Buffering under VSAM RLS .. VSAM RLS/CICS data set recovery .. Backup and recovery of VSAM data sets .. Recover a VSAM data set.. Transactional recovery .. The SMSVSAM address space.. DFSMStvs introduction .. Components used by DFSMStvs .. DFSMStvs use of z/OS RRMS .. Atomic updates .. Unit of work and unit of recovery.. DFSMStvs logging .. Accessing a data set with DFSMStvs.

10 Application considerations .. Break processing into a series of transactions .. Modify the program or JCL to request DFSMStvs access .. The DFSMStvs instance .. Interacting with DFSMStvs .. 135 Chapter 8. Storage management hardware .. Overview of DASD types.. DASD based on RAID technology .. Redundant Array of Independent Disks .. RAID implementations .. IBM DS8000 series .. DS8000 hardware overview .. DS8000 major components .. IBM TotalStorage Resiliency Family .. Copy Services .. FlashCopy .. Metro Mirror function .. 146 Contents Global Copy function.. Global Mirror function .. Metro/Global Mirror function .. z/OS Global Mirror function.