ABCs of z/OS System Programming Volume 3 - IBM Redbooks

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7.2 Base VSAM buffering Three types of base VSAM buffering NSR - non-shared resources LSR - local shared resources GSR - global shared resources Specified in the VSAM ACB macro: MACRF=(NSR/LSR/GSR) Figure 7-2 Base VSAM buffering Three types of base VSAM buffering Before VSAM RLS there were only three buffering techniques available for the user that opens the data set. NSR - non-shared resources For NSR, data buffers belong to a particular request parameter list (RPL). When an application uses an RPL (for example, for a direct GET request), VSAM manages the buffers as follows: 1. For record 1000, VSAM locates the CI containing the record and reads it into the local buffer in private storage. 2. If the next GET request is for record 5000, which is in a separate CI from record 1000, VSAM overwrites the buffer with the new CI. 3. Another GET request for record 1001, which is in the same CI as record 1000, causes another I/O request for the CI to read it into the buffer, because it had been overlaid by the second request for record 5000. 380 ABCs of z/OS System Programming Volume 3
LSR - local shared resources For LSR, data buffers are managed so that the buffers will not be overlaid. Before opening the data set, the user builds a resource pool in private storage using the BLDVRP macro. The LSR processing is as follows: 1. A GET request for record 1000 reads in the CI containing the record in one buffer of the buffer pool. 2. The next GET request for record 5000, which is in a separate CI, will read in the CI in another, separate buffer in the same buffer pool. 3. A third GET request for record 1001 can be satisfied by using the CI that was read in for the request for record 1000. GSR - global shared resources GSR is the same concept as LSR. The only difference is, with GSR the buffer pool and VSAM control blocks are built in common storage and can be accessed by any address space in the system. For more information about VSAM buffering techniques refer to 4.44, “VSAM: Buffering modes” on page 177. MACRF=(NSR/LSR/GSR) The Access Method Control block (ACB) describes an open VSAM data set. A subparameter for the ACB macro is MACRF, in which you can specify the buffering technique to be used by VSAM. For LSR and GSR, you need to run the BLDVRP macro before opening the data set to create the resource pool. For information about VSAM macros, see z/OS DFSMS: Macro Instructions for Data Sets, SC26-7408. Chapter 7. DFSMS Transactional VSAM Services 381
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ibm.com/redbooks Front cover ABCs o
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Note: Before using this information
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3.10 Data sets eligible for EAV vol
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5.5 Implementing SMS policies. . .
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7.29 Accessing a data set with DFSM
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Trademarks IBM, the IBM logo, and i
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Paul Rogers is a Consulting IT Spec
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xiv ABCs of z/OS System Programming
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1.1 Introduction to DFSMS IBM 3494
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Network File System The Network Fil
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Using access methods, commands, and
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Distributed data management DFSMSds
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Shelf management DFSMSrmm groups in
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Availability management DFSMShsm ba
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key functions that enable multiple
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An access method is a DFSMSdfp comp
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including the operating system itse
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2.3 DFSMSdfp data set types Data se
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2.4 Types of VSAM data sets Types o
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Partitioned data set (PDS) Partitio
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► Extended-addressability, which
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method writes data on the first vol
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SMS calculates the average preferen
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Restriction: The following types of
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► REXX LISTDSI function ► CLIST
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Using CLIST OPENFILE INPUT/GETFILE
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2.12 z/OS UNIX files Following are
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Logical records and blocks To an ap
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2.14 Locating an existing data set
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2.15 Uncataloged and cataloged data
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2.17 VTOC and DSCBs VTOC DSCBs Figu
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2.18 VTOC index structure VOLUME LA
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2.19 Initializing a volume using IC
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52 ABCs of z/OS System Programming
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3.1 Traditional DASD capacity 885 C
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Large volume support design conside
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DASD virtual visibility Traditional
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3.4 WLM controlling PAVs zSeries WL
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3.5 Parallel Access Volumes (PAVs)
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3.6 HyperPAV feature for DS8000 ser
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For each z/OS image within the sysp
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Note: With the 3390 Model A, the mo
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Note the following points regarding
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EAS non-eligible data sets An EAS-i
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same as for previous 3390 model dev
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3.13 Using dynamic volume expansion
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3.15 Using Web browser GUI Need a U
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3.17 Increase capacity of volumes F
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3.19 Final capacity increase for vo
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VTOC index changes The index block
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The documentation is in Device Supp
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free space available following the
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Note: The refresh of the index occu
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Updating the VTOC following volume
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USEEAV(YES|NO) YES This means that
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Generally, for VSAM data set alloca
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attributes can reside in the extend
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Other methods for EATTR specificati
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3.30 Migration assistance tracker T
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3.31 Migration tracker commands SET
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4.1 Overview of DFSMSdfp utilities
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4.2 IEBCOMPR utility Example 1 Exam
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4.3 IEBCOPY utility //COPY JOB ...
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4.4 IEBCOPY: Copy operation DATA.SE
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4.5 IEBCOPY: Compress operation DAT
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Copying to z/OS UNIX IEBGENER can b
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4.8 IEBGENER: Copying data to tape
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4.10 IEHLIST LISTVTOC output CONTEN
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Examples of IEHINITT In the example
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4.13 DFSMSdfp access methods DFSMSd
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physical blocks. QSAM also guarante
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The automatic class selection (ACS)
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Command Functions DEFINE PAGESPACE
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Note: These commands cannot be used
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► Capacity planning: Capacity pla
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A GDS has sequentially ordered abso
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The parameters are: NAME This speci
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4.21 Relative generation numbers A.
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4.23 PDS data set organization Adva
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4.24 Partitioned data set extended
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4.25 PDSE enhancements PDSE, two ad
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4.26 PDSE: Conversion Using DFSMSds
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4.27 Program objects in a PDSE Func
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4.28 Sequential access methods Sequ
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4.29 z/OS V1R9 QSAM - BSAM enhancem
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4.30 Virtual storage access method
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4.31 VSAM terminology Logical recor
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4.32 VSAM: Control interval (CI) LR
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4.33 VSAM data set components Clust
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4.34 VSAM key sequenced cluster (KS
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The sequence is as follows: 1. VSAM
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4.37 VSAM: Typical ESDS processing
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4.39 VSAM: Typical RRDS processing
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4.41 VSAM: Data-in-virtual (DIV) DI
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4.43 VSAM resource pool VSAM resour
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► CIs are discarded as soon as th
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SMB processing techniques If all of
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MSG=SMBBIAS When you specify MSG =
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4.47 VSAM SMB enhancement with z/OS
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4.48 VSAM enhancements Data compres
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4.50 Data set separation syntax Dat
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4.51 Data facility sort (DFSORT) Pa
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4.52 z/OS Network File System (z/OS
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4.53 DFSMS optimizer (DFSMSopt) Fig
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4.54 Data Set Services (DFSMSdss) /
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4.55 DFSMSdss: Physical and logical
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When to use logical processing Use
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When to use physical processing Use
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4.59 Hierarchical Storage Manager (
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Tasks for availability management f
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- Release of unused, over-allocated
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usually slower response time. Usual
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DATASSETSIZE(dssize) This specifies
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► Utilize OVERFLOW volumes for mi
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Before automatic secondary space ma
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For data sets larger than 58 K trac
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► Migration level 1 (ML1) volumes
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value of a user-specified RETPD or
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The second-newest version is treate
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If the version has a specified rete
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ACS routines For both automatic and
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- System-managed automated tape lib
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4.75 What DFSMSrmm can manage Remov
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You can also use the DFSMSrmm built
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z/OS V1R8 enhancements DFSMSrmm hel
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5.1 Storage management ISMF dss Fig
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5.3 Goals and benefits of system-ma
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Improved data availability manageme
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► Whether data sets are to be kep
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When the ACS routines are started a
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5.7 Assigning data to be system-man
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Even though data class is optional,
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You can use the ACCESSIBILITY attri
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If you do not explicitly assign a m
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5.12 Using storage groups DFSMShsm-
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5.13 Using aggregate backup and rec
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5.14 Automatic Class Selection (ACS
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5.15 SMS configuration An SMS confi
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5.16 SMS control data sets SMS Figu
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5.17 Implementing DFSMS Enabling th
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► Gain experience with the operat
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Specify SHAREOPTIONS(3,3) for the A
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Defining the SMS base configuration
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5.21 Creating ACS routines Storage
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5.22 DFSMS setup for z/OS IEASYSxx
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5.23 Starting SMS and activating a
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5.24 Control SMS processing with op
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5.25 Displaying the SMS configurati
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exception. If it is clear that a PD
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sets (see Figure 5-27 on page 287).
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Using a high level qualifier (HLQ)
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5.30 Establishing installation stan
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5.32 Data class attributes Data cla
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5.34 Simplifying JCL use Figure 5-3
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► The AVGREC attribute indicates
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Considerations when specifying spac
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5.38 SMS PDSE support SMS PDSE supp
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5.40 Allocating new PDSEs //ALLOC E
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Production batch refers to data cre
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tape are stored as a tape data set
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5.44 ISMF: Product relationships IS
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5.45 ISMF: What you can do with ISM
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5.46 ISMF: Accessing ISMF Panel Hel
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5.48 ISMF: Obtaining information ab
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5.49 ISMF: Data set option Figure 5
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5.51 ISMF: Management Class option
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5.53 ISMF: Storage Class option Fig
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6.1 Catalogs ICF structure 1 ICF st
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6.2 The basic catalog structure (BC
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Page 364 and 365: Note: When you delete a data set, t
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Page 368 and 369: Note: The command will result in er
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Page 386 and 387: Restarting the catalog address spac
Page 388 and 389: ► MODIFY CATALOG,LIST The LIST co
Page 390 and 391: Recover from performance slow downs
Page 392 and 393: 2. Define or alter your existing ca
Page 394 and 395: 7.1 VSAM share options Share option
Page 398 and 399: 7.3 Base VSAM locking Figure 7-3 Ex
Page 400 and 401: 7.5 VSAM record-level sharing intro
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Page 404 and 405: 7.8 Buffering under VSAM RLS CICS R
Page 406 and 407: 7.9 VSAM RLS locking control interv
Page 408 and 409: 7.10 VSAM RLS/CICS data set recover
Page 410 and 411: 7.11 Transactional recovery Commite
Page 412 and 413: 7.13 VSAM RLS implementation Update
Page 414 and 415: Cache structures Coupling Facility
Page 416 and 417: 7.15 Update PARMLIB with VSAM RLS p
Page 418 and 419: 7.16 Define sharing control data se
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Page 422 and 423: Command ===> Figure 7-22 CF cache u
Page 424 and 425: 7.18 Update data sets with log para
Page 426 and 427: 7.19 The SMSVSAM address space RLS
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Page 430 and 431: To learn about other DISPLAY comman
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Page 434 and 435: ► RECOVERY REQUIRED This field in
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Page 442 and 443: 7.27 Unit of work and unit of recov
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7.30 Application considerations Bre
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7.31 DFSMStvs logging implementatio
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LABEL JOB ... //STEP10 EXEC PGM=IXC
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7.33 Update PARMLIB with DFSMStvs p
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7.34 The DFSMStvs instance CICSA R/
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Changes to parameters other than AK
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7.36 Summary Figure 7-48 Summary Ba
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8.1 Overview of DASD types Traditio
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8.2 Redundant array of independent
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8.3 Seascape architecture Powerful
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► Data copy sharing Data copy sha
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NVS cache NVS is used to store a se
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8.6 ESS major components Figure 8-6
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8.8 FICON host adapters FICON host
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8.9 ESS disks Eight-packs Set of 8
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8.10 ESS device adapters SSA 160 De
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8.11 SSA loops SSA operation 4 link
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8.12 RAID-10 RAID-10 configurations
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8.13 Storage balancing with RAID-10
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Peer-to-peer remote copy (PPRC) PPR
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8.15 ESS performance features Prior
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8.16 IBM TotalStorage DS6000 Enterp
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DS6000 expansion enclosure (Model 1
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support for one or two expansion fr
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The DS8300 models can support eithe
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consolidations where separate stora
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Copy Services include the following
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TotalStorage Expert helps storage a
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identifying the data set and descri
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Table 8-4 Types of labels Code Mean
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equired. Therefore, the resulting t
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Drive designed for automation solut
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3494 models and features IBM 3494 o
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Each FICON channel in the VTS can s
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In addition to the 3494 VTS compone
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► Consolidation Another benefit i
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Online resources ► z/OS DFSMShsm
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