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

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Aliases to the catalog can be defined if you use DFSMSdss, DFSMShsm, or if you specify ALIAS on the IMPORT command. If you have not deleted and redefined the catalog, all existing aliases are maintained, and any aliases defined in the backup copy are redefined if they are not already defined. Lock the BCS before you start recovery so that no one else has access to it while you recover the BCS. If you do not restrict access to the catalog, users might be able to update the catalog during recovery or maintenance and create a data integrity exposure. The catalog also will be unavailable to any system that shares the catalog. You cannot lock a master catalog. After you recover the catalog, update the BCS with any changes which have occurred since the last backup, for example, by running IDCAMS DEFINE RECATALOG for all missing entries. You can use the access method services DIAGNOSE command to identify certain unsynchronized entries. The Integrated Catalog Forward Recovery Utility You also can use the Integrated Catalog Forward Recovery Utility (ICFRU) to recover a damaged catalog to a correct and current status. This utility uses SMF records that record changes to the catalog, updating the catalog with changes made since the BCS was backed up. The SMF records are used by ICFRU as a login database. Use ICFRU to avoid the loss of catalog data even after recovery. Recovery step by step Follow these steps to recover a BCS using the IDCAMS IMPORT command: 1. If the catalog is used by the job scheduler for any batch jobs, hold the job queue for all job classes except the one you use for the recovery. 2. Lock the catalog using the IDCAMS ALTER LOCK command. 3. Use ICFRU to create an updated version of your last EXPORT backup. 4. Import the most current backup copy of the BCS (which contains the BCS's aliases as they existed when the backup was made). For example, use this JCL: //RECOVER EXEC PGM=IDCAMS //BACKCOPY DD DSN=BACKUP.SYS1.ICFCAT.PROJECT1,DISP=OLD //SYSPRINT DD SYSOUT=A //SYSIN DD * IMPORT INFILE(BACKCOPY) - OUTDATASET(SYS1.ICFCAT.PROJECT1) - ALIAS - LOCK 5. If you did not run step 3, manually update the catalog with the changes made between the last backup and the time of error, for example by using IDCAMS DEFINE RECATALOG. 6. Use IDCAMS DIAGNOSE and EXAMINE commands to check the contents and integrity of the catalog (see 6.15, “Checking the integrity on an ICF structure” on page 357). 7. If the catalog is shared by other systems and was disconnect there for recovery, run IDCAMS IMPORT CONNECT ALIAS on those systems to reconnect the user catalog to the master catalog. 8. Unlock the catalog using IDCAMS ALTER UNLOCK. 9. Free the job queue if you put it on hold. For further information about recovery procedures, see z/OS DFSMS: Managing Catalogs, SC26-7409. For information about the IDCAMS facility, see z/OS DFSMS Access Method Services for Catalogs, SC26-7394. 356 ABCs of z/OS System Programming Volume 3
6.15 Checking the integrity on an ICF structure UCAT1 Index Data component DSNAME1 DSNAME2 DSNAME3 DSNAME4 DSNAME5 . . . DSNAMEn DSNAME1 VOL001 ... DSNAME2 DSNAME3 DSNAME4 DSNAME5 DSNAMEn Figure 6-28 Errors in an ICF structure ... ... ... ... ... VOL002 VOL001 VOL002 VOL001 VSAM error, detected by EXAMINE VOL002 DSNAME1 ... UCAT1 DSNAME3 ... UCAT1 DSNAME5 ... UCAT27 DSNAME2 ... UCAT1 DSNAME4 ... UCAT1 DSNAMEn ... UCAT1 VOL001 VOL002 Two types of errors There are two types of errors in the ICF structure that cause the need for recovery. They are: ► An error in the structural integrity of the BCS or VVDS as VSAM data sets - VSAM error Errors in the structure of a BCS as a VSAM KSDS or the VVDS as a VSAM ESDS data set usually mean that the data set is broken (logically or physically). The data set no longer has a valid structure that the VSAM component can handle. VSAM does not care about the contents of the records in the BCS or VVDS. ► An error within the data structure of a BCS or VVDS - catalog error The VSAM structure of the BCS or VVDS is still valid. VSAM has no problems accessing the data set. However, the content of the single records in the BCS or VVDS does not conform with the catalog standards. The information in the BCS and VVDS for a single data set can be unsynchronized, thereby making the data set inaccessible. VSAM errors Two kinds of VSAM errors that can occur with your BCS or VVDS: ► Logical errors The records on the DASD volume still have valid physical characteristics like record size or CI size. The VSAM information in those records is wrong, like pointers from one record to another or the end-of-file information. VVDS VVDS catalog error, detected by DIAGNOSE Chapter 6. Catalogs 357
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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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Page 342 and 343: 6.1 Catalogs ICF structure 1 ICF st
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Page 346 and 347: 6.3 The VSAM volume data set (VVDS)
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Page 358 and 359: 6.8 Using multiple catalogs CATALOG
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Page 364 and 365: Note: When you delete a data set, t
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Page 374 and 375: ► Physical errors The records on
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Page 384 and 385: Catalog report output This MODIFY c
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 396 and 397: 7.2 Base VSAM buffering Three types
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Page 400 and 401: 7.5 VSAM record-level sharing intro
Page 402 and 403: ► Non-CICS jobs can have read-onl
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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Command ===> Figure 7-22 CF cache u
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7.18 Update data sets with log para
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7.19 The SMSVSAM address space RLS
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7.20 Interacting with VSAM RLS Inte
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To learn about other DISPLAY comman
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to use this specification or the sp
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► RECOVERY REQUIRED This field in
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DFSMStvs is a follow-on project/cap
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Like CICS, DFSMStvs does not perfor
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It is RRS that provides the means t
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7.27 Unit of work and unit of recov
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► Log of logs (optional, shared w
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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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