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

More documents

Recommendations

Info

DATASSETSIZE(dssize) This specifies the minimum size, in K bytes, of the data set for which an ML1 OVERFLOW volume is preferred for migration or backup. This includes invoking inline backup, the HBACKDS or BACKDS commands, or the ARCHBACK macro. This parameter has the same meaning when applied to SMS-managed or non-SMS-managed DASD volumes or data sets. The SETSYS default is 2000000 K bytes. The DFSMShsm default, if you do not specify this parameter on any SETSYS command, will use the value of 2000000 K bytes. If the calculated size of a data set being backed up or migrated is equal to or greater than dssize, then DFSMShsm prefers the OVERFLOW ML1 volume with the least amount of free space that still has enough remaining space for the data set. If the calculated size of the data set is less than the minimum size specified in dssize, then DFSMShsm prefers the NOOVERFLOW ML1 volume with the maximum amount of free space and least number of users. OVERFLOW and NOOVERFLOW volumes DFSMShsm can create backup copies to either ML1 backup OVERFLOW volumes or NOOVERFLOW volumes. Use the SETSYS ML1OVERFLOW(DATASETSIZE(dssize)) command to specify the minimum size in K bytes (where K=1024) of the data set for which an ML1 OVERFLOW volume is preferred for the migration or backup copy. For data sets smaller than 58 K tracks, DFSMShsm allocates a basic sequential format data set for the backup copy. For data sets larger than 58 K tracks, DFSMShsm allocates a large format sequential data set for the backup copy. Basic or large format sequential data sets will prefer OVERFLOW or NOOVERFLOW volumes based on the SETSYS ML1OVERFLOW(DATASETSIZE(dssize)) value. If there is not enough free space on the NOOVERFLOW or OVERFLOW volume for a particular backup copy, then DFSMShsm tries to create the backup on a OVERFLOW or NOOVERFLOW volume, respectively. If the data set is too large to fit on a single ML1 volume (OVERFLOW or NOOVERFLOW), then the migration or backup fails. 212 ABCs of z/OS System Programming Volume 3
4.64 DFSMShsm z/OS V1R11 enhancements Data sets that were larger than 64 K tracks in size can migrate/backup only to tape Can now migrate/backup a data set larger than 64 K tracks Can go to DASD as large format sequential (LFS) data sets OVERFLOW volumes can be only used for backups and preference is not given to them for data sets larger in size OVERFLOW volumes can now be utilized for migration and backup copies for data sets of an installation-specified size Improves free space utilization on ML1 volumes Figure 4-75 OVERFLOW volumes used for backup OVERFLOW or NOOVERFLOW use of level 1 volumes Using these type of volumes for data set migration and backup works as follows: ► OVERFLOW and NOOVERFLOW are mutually exclusive optional subparameters of the MIGRATION parameter that you use to specify how a level 1 volume is considered during selection for placement of a data set migration or backup version. ► OVERFLOW specifies that the volume is considered if either of the following are true: – The data you are migrating or backing up is larger than a given size, as specified on the SETSYS ML1OVERFLOW(DATASETSIZE(dssize)) command. – DFSMShsm cannot allocate enough space on a NOOVERFLOW volume. – NOOVERFLOW specifies that the volume is considered with other level 1 volumes for migration data and backup versions of any size. – Defaults: If you are adding a migration volume to DFSMShsm, the default is NOOVERFLOW. If you are changing the attributes of a volume and do not specify either subparameter, the overflow attribute is not changed. Migration and backup to tape Using the DFSMShsm ML1 enhancements, the installation now can: ► Back up and migrate data sets larger than 64 K to disk as large format sequential (LFS) data sets. Chapter 4. Storage management software 213
Page 1:
ibm.com/redbooks Front cover ABCs o
Page 4 and 5:
Note: Before using this information
Page 6 and 7:
3.10 Data sets eligible for EAV vol
Page 8 and 9:
5.5 Implementing SMS policies. . .
Page 10 and 11:
7.29 Accessing a data set with DFSM
Page 12 and 13:
Trademarks IBM, the IBM logo, and i
Page 14 and 15:
Paul Rogers is a Consulting IT Spec
Page 16 and 17:
xiv ABCs of z/OS System Programming
Page 18 and 19:
1.1 Introduction to DFSMS IBM 3494
Page 20 and 21:
Network File System The Network Fil
Page 22 and 23:
Using access methods, commands, and
Page 24 and 25:
Distributed data management DFSMSds
Page 26 and 27:
Shelf management DFSMSrmm groups in
Page 28 and 29:
Availability management DFSMShsm ba
Page 30 and 31:
key functions that enable multiple
Page 32 and 33:
An access method is a DFSMSdfp comp
Page 34 and 35:
including the operating system itse
Page 36 and 37:
2.3 DFSMSdfp data set types Data se
Page 38 and 39:
2.4 Types of VSAM data sets Types o
Page 40 and 41:
Partitioned data set (PDS) Partitio
Page 42 and 43:
► Extended-addressability, which
Page 44 and 45:
method writes data on the first vol
Page 46 and 47:
SMS calculates the average preferen
Page 48 and 49:
Restriction: The following types of
Page 50 and 51:
► REXX LISTDSI function ► CLIST
Page 52 and 53:
Using CLIST OPENFILE INPUT/GETFILE
Page 54 and 55:
2.12 z/OS UNIX files Following are
Page 56 and 57:
Logical records and blocks To an ap
Page 58 and 59:
2.14 Locating an existing data set
Page 60 and 61:
2.15 Uncataloged and cataloged data
Page 62 and 63:
2.17 VTOC and DSCBs VTOC DSCBs Figu
Page 64 and 65:
2.18 VTOC index structure VOLUME LA
Page 66 and 67:
2.19 Initializing a volume using IC
Page 68 and 69:
52 ABCs of z/OS System Programming
Page 70 and 71:
3.1 Traditional DASD capacity 885 C
Page 72 and 73:
Large volume support design conside
Page 74 and 75:
DASD virtual visibility Traditional
Page 76 and 77:
3.4 WLM controlling PAVs zSeries WL
Page 78 and 79:
3.5 Parallel Access Volumes (PAVs)
Page 80 and 81:
3.6 HyperPAV feature for DS8000 ser
Page 82 and 83:
For each z/OS image within the sysp
Page 84 and 85:
Note: With the 3390 Model A, the mo
Page 86 and 87:
Note the following points regarding
Page 88 and 89:
EAS non-eligible data sets An EAS-i
Page 90 and 91:
same as for previous 3390 model dev
Page 92 and 93:
3.13 Using dynamic volume expansion
Page 94 and 95:
3.15 Using Web browser GUI Need a U
Page 96 and 97:
3.17 Increase capacity of volumes F
Page 98 and 99:
3.19 Final capacity increase for vo
Page 100 and 101:
VTOC index changes The index block
Page 102 and 103:
The documentation is in Device Supp
Page 104 and 105:
free space available following the
Page 106 and 107:
Note: The refresh of the index occu
Page 108 and 109:
Updating the VTOC following volume
Page 110 and 111:
USEEAV(YES|NO) YES This means that
Page 112 and 113:
Generally, for VSAM data set alloca
Page 114 and 115:
attributes can reside in the extend
Page 116 and 117:
Other methods for EATTR specificati
Page 118 and 119:
3.30 Migration assistance tracker T
Page 120 and 121:
3.31 Migration tracker commands SET
Page 122 and 123:
Page 124 and 125:
4.1 Overview of DFSMSdfp utilities
Page 126 and 127:
4.2 IEBCOMPR utility Example 1 Exam
Page 128 and 129:
4.3 IEBCOPY utility //COPY JOB ...
Page 130 and 131:
4.4 IEBCOPY: Copy operation DATA.SE
Page 132 and 133:
4.5 IEBCOPY: Compress operation DAT
Page 134 and 135:
Copying to z/OS UNIX IEBGENER can b
Page 136 and 137:
4.8 IEBGENER: Copying data to tape
Page 138 and 139:
4.10 IEHLIST LISTVTOC output CONTEN
Page 140 and 141:
Examples of IEHINITT In the example
Page 142 and 143:
4.13 DFSMSdfp access methods DFSMSd
Page 144 and 145:
physical blocks. QSAM also guarante
Page 146 and 147:
The automatic class selection (ACS)
Page 148 and 149:
Command Functions DEFINE PAGESPACE
Page 150 and 151:
Note: These commands cannot be used
Page 152 and 153:
► Capacity planning: Capacity pla
Page 154 and 155:
A GDS has sequentially ordered abso
Page 156 and 157:
The parameters are: NAME This speci
Page 158 and 159:
4.21 Relative generation numbers A.
Page 160 and 161:
4.23 PDS data set organization Adva
Page 162 and 163:
4.24 Partitioned data set extended
Page 164 and 165:
4.25 PDSE enhancements PDSE, two ad
Page 166 and 167:
4.26 PDSE: Conversion Using DFSMSds
Page 168 and 169:
4.27 Program objects in a PDSE Func
Page 170 and 171:
4.28 Sequential access methods Sequ
Page 172 and 173:
4.29 z/OS V1R9 QSAM - BSAM enhancem
Page 174 and 175:
4.30 Virtual storage access method
Page 176 and 177:
4.31 VSAM terminology Logical recor
Page 178 and 179: 4.32 VSAM: Control interval (CI) LR
Page 180 and 181: 4.33 VSAM data set components Clust
Page 182 and 183: 4.34 VSAM key sequenced cluster (KS
Page 184 and 185: The sequence is as follows: 1. VSAM
Page 186 and 187: 4.37 VSAM: Typical ESDS processing
Page 188 and 189: 4.39 VSAM: Typical RRDS processing
Page 190 and 191: 4.41 VSAM: Data-in-virtual (DIV) DI
Page 192 and 193: 4.43 VSAM resource pool VSAM resour
Page 194 and 195: ► CIs are discarded as soon as th
Page 196 and 197: SMB processing techniques If all of
Page 198 and 199: MSG=SMBBIAS When you specify MSG =
Page 200 and 201: 4.47 VSAM SMB enhancement with z/OS
Page 202 and 203: 4.48 VSAM enhancements Data compres
Page 204 and 205: 4.50 Data set separation syntax Dat
Page 206 and 207: 4.51 Data facility sort (DFSORT) Pa
Page 208 and 209: 4.52 z/OS Network File System (z/OS
Page 210 and 211: 4.53 DFSMS optimizer (DFSMSopt) Fig
Page 212 and 213: 4.54 Data Set Services (DFSMSdss) /
Page 214 and 215: 4.55 DFSMSdss: Physical and logical
Page 216 and 217: When to use logical processing Use
Page 218 and 219: When to use physical processing Use
Page 220 and 221: 4.59 Hierarchical Storage Manager (
Page 222 and 223: Tasks for availability management f
Page 224 and 225: - Release of unused, over-allocated
Page 226 and 227: usually slower response time. Usual
Page 230 and 231: ► Utilize OVERFLOW volumes for mi
Page 232 and 233: Before automatic secondary space ma
Page 234 and 235: For data sets larger than 58 K trac
Page 236 and 237: ► Migration level 1 (ML1) volumes
Page 238 and 239: 222 ABCs of z/OS System Programming
Page 240 and 241: value of a user-specified RETPD or
Page 242 and 243: The second-newest version is treate
Page 244 and 245: If the version has a specified rete
Page 246 and 247: ACS routines For both automatic and
Page 248 and 249: - System-managed automated tape lib
Page 250 and 251: 4.75 What DFSMSrmm can manage Remov
Page 252 and 253: You can also use the DFSMSrmm built
Page 254 and 255: z/OS V1R8 enhancements DFSMSrmm hel
Page 256 and 257: 5.1 Storage management ISMF dss Fig
Page 258 and 259: 5.3 Goals and benefits of system-ma
Page 260 and 261: Improved data availability manageme
Page 262 and 263: ► Whether data sets are to be kep
Page 264 and 265: When the ACS routines are started a
Page 266 and 267: 5.7 Assigning data to be system-man
Page 268 and 269: Even though data class is optional,
Page 270 and 271: You can use the ACCESSIBILITY attri
Page 272 and 273: If you do not explicitly assign a m
Page 274 and 275: 5.12 Using storage groups DFSMShsm-
Page 276 and 277: 5.13 Using aggregate backup and rec
Page 278 and 279:
5.14 Automatic Class Selection (ACS
Page 280 and 281:
5.15 SMS configuration An SMS confi
Page 282 and 283:
5.16 SMS control data sets SMS Figu
Page 284 and 285:
5.17 Implementing DFSMS Enabling th
Page 286 and 287:
► Gain experience with the operat
Page 288 and 289:
Specify SHAREOPTIONS(3,3) for the A
Page 290 and 291:
Defining the SMS base configuration
Page 292 and 293:
5.21 Creating ACS routines Storage
Page 294 and 295:
5.22 DFSMS setup for z/OS IEASYSxx
Page 296 and 297:
5.23 Starting SMS and activating a
Page 298 and 299:
5.24 Control SMS processing with op
Page 300 and 301:
5.25 Displaying the SMS configurati
Page 302 and 303:
exception. If it is clear that a PD
Page 304 and 305:
sets (see Figure 5-27 on page 287).
Page 306 and 307:
Using a high level qualifier (HLQ)
Page 308 and 309:
5.30 Establishing installation stan
Page 310 and 311:
5.32 Data class attributes Data cla
Page 312 and 313:
5.34 Simplifying JCL use Figure 5-3
Page 314 and 315:
► The AVGREC attribute indicates
Page 316 and 317:
Considerations when specifying spac
Page 318 and 319:
5.38 SMS PDSE support SMS PDSE supp
Page 320 and 321:
5.40 Allocating new PDSEs //ALLOC E
Page 322 and 323:
Production batch refers to data cre
Page 324 and 325:
tape are stored as a tape data set
Page 326 and 327:
5.44 ISMF: Product relationships IS
Page 328 and 329:
5.45 ISMF: What you can do with ISM
Page 330 and 331:
5.46 ISMF: Accessing ISMF Panel Hel
Page 332 and 333:
5.48 ISMF: Obtaining information ab
Page 334 and 335:
5.49 ISMF: Data set option Figure 5
Page 336 and 337:
5.51 ISMF: Management Class option
Page 338 and 339:
5.53 ISMF: Storage Class option Fig
Page 340 and 341:
Page 342 and 343:
6.1 Catalogs ICF structure 1 ICF st
Page 344 and 345:
6.2 The basic catalog structure (BC
Page 346 and 347:
6.3 The VSAM volume data set (VVDS)
Page 348 and 349:
6.4 Catalogs by function SYSCAT VOL
Page 350 and 351:
User catalogs The difference betwee
Page 352 and 353:
Multilevel aliases You can augment
Page 354 and 355:
Defining a cataloged data set When
Page 356 and 357:
The example in Figure 6-9 on page 3
Page 358 and 359:
6.8 Using multiple catalogs CATALOG
Page 360 and 361:
If you need to share data sets acro
Page 362 and 363:
► List a user catalog connector i
Page 364 and 365:
Note: When you delete a data set, t
Page 366 and 367:
DELET6 JOB ... //STEP1 EXEC PGM=IDC
Page 368 and 369:
Note: The command will result in er
Page 370 and 371:
You can later recover the backup co
Page 372 and 373:
Aliases to the catalog can be defin
Page 374 and 375:
► Physical errors The records on
Page 376 and 377:
Because APF authorization is establ
Page 378 and 379:
3. Use EXAMINE and DIAGNOSE to ensu
Page 380 and 381:
5. Use REPRO MERGECAT to split the
Page 382 and 383:
The two types of buffer are used to
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
Page 398 and 399:
7.3 Base VSAM locking Figure 7-3 Ex
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
Page 420 and 421:
Tip: Place the SHCDSs on separate v
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
Page 428 and 429:
7.20 Interacting with VSAM RLS Inte
Page 430 and 431:
To learn about other DISPLAY comman
Page 432 and 433:
to use this specification or the sp
Page 434 and 435:
► RECOVERY REQUIRED This field in
Page 436 and 437:
DFSMStvs is a follow-on project/cap
Page 438 and 439:
Like CICS, DFSMStvs does not perfor
Page 440 and 441:
It is RRS that provides the means t
Page 442 and 443:
7.27 Unit of work and unit of recov
Page 444 and 445:
► Log of logs (optional, shared w
Page 446 and 447:
7.30 Application considerations Bre
Page 448 and 449:
7.31 DFSMStvs logging implementatio
Page 450 and 451:
LABEL JOB ... //STEP10 EXEC PGM=IXC
Page 452 and 453:
7.33 Update PARMLIB with DFSMStvs p
Page 454 and 455:
7.34 The DFSMStvs instance CICSA R/
Page 456 and 457:
Changes to parameters other than AK
Page 458 and 459:
7.36 Summary Figure 7-48 Summary Ba
Page 460 and 461:
Page 462 and 463:
8.1 Overview of DASD types Traditio
Page 464 and 465:
8.2 Redundant array of independent
Page 466 and 467:
8.3 Seascape architecture Powerful
Page 468 and 469:
► Data copy sharing Data copy sha
Page 470 and 471:
NVS cache NVS is used to store a se
Page 472 and 473:
8.6 ESS major components Figure 8-6
Page 474 and 475:
8.8 FICON host adapters FICON host
Page 476 and 477:
8.9 ESS disks Eight-packs Set of 8
Page 478 and 479:
8.10 ESS device adapters SSA 160 De
Page 480 and 481:
8.11 SSA loops SSA operation 4 link
Page 482 and 483:
8.12 RAID-10 RAID-10 configurations
Page 484 and 485:
8.13 Storage balancing with RAID-10
Page 486 and 487:
Peer-to-peer remote copy (PPRC) PPR
Page 488 and 489:
8.15 ESS performance features Prior
Page 490 and 491:
8.16 IBM TotalStorage DS6000 Enterp
Page 492 and 493:
DS6000 expansion enclosure (Model 1
Page 494 and 495:
support for one or two expansion fr
Page 496 and 497:
The DS8300 models can support eithe
Page 498 and 499:
consolidations where separate stora
Page 500 and 501:
Copy Services include the following
Page 502 and 503:
TotalStorage Expert helps storage a
Page 504 and 505:
identifying the data set and descri
Page 506 and 507:
Table 8-4 Types of labels Code Mean
Page 508 and 509:
equired. Therefore, the resulting t
Page 510 and 511:
Drive designed for automation solut
Page 512 and 513:
3494 models and features IBM 3494 o
Page 514 and 515:
Each FICON channel in the VTS can s
Page 516 and 517:
In addition to the 3494 VTS compone
Page 518 and 519:
► Consolidation Another benefit i
Page 520 and 521:
Online resources ► z/OS DFSMShsm
Page 522:
ABCs of z/OS System Programming Vol
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?