an introduction to z/os dasd backup and archiving · 2015-03-03 · an introduction to z/os dasd...
TRANSCRIPT
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An Introduction to
z/OS DASD Backup and Archiving
Session 17061
Steve PryorDTS Software, Inc.
[email protected]@veritysys.com
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Storage ManagementObjectives
● Data Availability● Data available even if logically/physically damaged● Dataset Backup and Recover/Restore
● Space Availability● Sufficient free space for new/extended datasets● Dataset Migrate/Archive and Recall
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Backup vs. Archive/Migration
● Backup– Short term (usually)
– Multiple copies
– Vault offsite
● Archive– Long term (years)
– 1 or 2 copies
– Recycle needed
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Storage Hierarchy
Low CostUnlimited Resource
Low Data Availability
Compressed Data (Migration Level 1)
Archived Data (Migration Level 2)
High CostLimited Resource
High Data Availability
Primary DASD (Migration Level 0)
Most frequently used
Least frequently used
Autostorage tiering
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Dataset Life Cycle
Dataset Creation
Open/Extend/Close
Backup / Restore
Migrate / Recall
Expiration and Deletion
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Backup and Restore Management
● When do backups run?● Daily? Weekly? >1 per day?
● What data is backed up? ● Updated data? All data? Selected data?
● How long is the backup retained?● How can the backup be found?● How is the backup restored?
● Overlay existing dataset? New volume?, Rename?
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DFSMS Manages Storage
Dataset
Data Class
MgmtClass
StorageClass
StorageGroup
Dataset Characteristics
What backupsare needed?
When should itmigrate?
What volume should be chosen?
What services?PAV?, striped?
applicationdatasets
BackupsArchives
Data Manager
Data Mover
SMS Constructs
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Important SMS Constructs
● Management Class– Expiration Attributes
– Migration Attributes
– Partial Release
– GDG generations
– Backup Attributes
– Transition Criteria
– ABARS Attributes
● Storage Group– Auto mig/bkup/dump
– dump class/system
– Alloc/migr threshold
– VOLSERs
datasets
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Fields used by DASD Managers
- DSN - dataset-changed (DS1IND02)- last-referenced date- backup infoVTOC
Format-1 DSCB
SYS1.VVDS.volser
- DSN / cluster name / components - Dataclas, Storclas, Mgmtclas name
VVR or NVR
z/OS Catalog
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Major DASD Management Vendors
IBM
Data Manager– DFSMShsm
Data Mover– DFSMSdss
IDP
Data Manager– FDRABR
Data Mover– FDR/FDRDSF
CA – CA-DISK
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DFSMShsm Backup Process
DFSMShsm
Select if updatedSelect if MC requires
Turn offChange bit
Create bkup/ dump copy(s)
OCDSBCDS
Dataset info
Bkup vol info
Journal
SMS SG AttributesorDFSMShsm Non-SMS Attributes
PRIMARYBACKUPDUMPMIGRATION
Automatic Backup or BACKVOL or BACKDS
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DFSMShsm Backup Process
● Types of Backup● Automatic Incremental Backup● Automatic Dump● Command Backup / Command Dump● Other
● Inline Backup● ABARS Backup● Fast Replication Backup
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DFSMShsm Backup
● Automatic Incremental Backup
● Automatic Dump
DEFINE BACKUP(YYYYYYN CYCLESTARTDATE(yyyy/mm/dd))SETSYS AUTOBACKUPSTART(starttime latest quiesce)SETSYS BACKUP(DASD | TAPE)SETSYS DUPLEX(BACKUP(Y | N))SETSYS MAXBACKUPTASKS(n)
DEFINE DUMPCYCLE(NNNNNNY CYCLESTARTDATE(yyyy/mm/dd))SETSYS AUTODUMPSTART(starttime latest quiesce)SETSYS MAXDUMPTASKS(n)DEFINE DUMPCLASS(name ...RETPD UNIT FREQ et al)
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DFSMShsm Backup
● Command Backup(H)BACKDS dsn TARGET NEWNAME RETAINDAYS et al
● Command DumpBACKVOL VOLUMES(volser) DUMP(DUMPCLASS(class)) RETPD(days)
BACKVOL STORAGEGROUP(sgname) DUMP(DUMPCLASS(class) STACK(nn))
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DFSMShsm - Locating the Backup
● Obtain Info from BCDS, MCDS, OCDS– TSO HLIST command
– DFSMShsm LIST command
– ISMF HLIST
LIST DSNAME(dsn) MCDS/BCDS/BOTH -
LIST(ODS(dsn)/SYSOUT/TERMINAL)
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Recover (Restore) from Backup
DTS002
DFSMShsm
Turn ONchange bitSet LRdate
Mount bkup copy
OCDSBCDS
obtaindatasetinfo
obtain vol info
Journal
ACS routines
DTS001
replace existing dataset
new or renameddataset
z/OS Catalog
(H)RECOVER command
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DFSMShsm Recovery Process
Types of Recovery● Dataset recovery from incremental
● Full volume restore from incremental
● Full volume restore from dump copy
● Other ● ABARS, Fast Replication Recovery
RECOVER * TOVOLUME(original_volser) UNIT(unittype) -FROMDUMP(DUMPVOLUME(tape_volser) APPLYINCREMENTAL)
(H)RECOVER dsn TOVOLUME(volser) UNIT(unit) REPLACE ...
RECOVER * TOVOLUME(volser) UNIT(unittype)
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DFSMShsm Backup Expiration
BCDS
EXPIREBV Command
SMS Constructs
Scan BCDS
Obtain MC info
Is backup expired?
is dataset deleted?
remove BCD record
(H)BDELETE Command
Delete backup version of dataset
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FDRABR Backup Process
FDRABR(FDRDSF)
Select if updatedSelect unless MC forbids
Turn offChange bit
Update DSCBbkup info
Create bkup copy(s)
ABRBackupCatalog
Bkup vol info
SMS SG Attributesand/or ABR Model DSCB
// EXEC PGM=FDRABR DUMP TYPE=FDR / ABR
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FDRABR Backup Process
Types of Backup● Incremental
● Full-Volume
● Other– Dataset (TYPE=DSF, TYPE=AUTO)
– Application (TYPE=APPL)
DUMP TYPE=ABRMOUNT VOL=, STORGRP=
DUMP TYPE=FDRMOUNT VOL=, STORGRP=
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FDRABR Backup Architecture
DTS001
VTOC
DSN=FDRABR.VTSO001
DSN=MY.DATA.SET
Volume Backup Info:-GEN, CYCLE, et al
Dataset Backup Info:-cycle table, flags, et al
FDRABRBackupCatalog
Tape Volume Info:Bkup DSN, fseq, expiration
Backup DSN=FDRABR.VDTS001.C1003404
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FDRABR – Locating the Backup
● Backup Information stored in:– Dataset F1DSCB (dataset exists)
– ABR Scratch Catalog (dataset deleted)
– ABR Backup Catalog (tape volume info)
● PGM=FDRABRP, PRINT BACKUP function● PGM=FDREPORT● ISPF panels
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FDRABR Recovery Process
FDRABR(FDRDSF)
Mount bkup tape
ABRBackupCatalog
Obtain tape vol info
// EXEC PGM=FDRABR RESTORE TYPE=ABR SELECT DSN=, NEWN=...
z/OS Catalog
ABRBackupCatalog
ABRScratchCatalog
Obtain bkup info if no F1DSCB
Obtain bkup info from F1DSCB
ACS Routines
replace existing dataset
new or renamed dataset
DTS001
DTS002
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FDRABR Backup Expiration
● All datasets on backup file expire together● Tape expiration via:
– EXPDT/RETPD in JCL (date or catalog control)
– ABR model if no JCL value • Same day as full vol for incremental
– Explicit expiration processing not required
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Dataset Life Cycle
Dataset Creation
Open/Extend/Close
Backup / Restore
Migrate / Recall
Expiration and Deletion
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Migration and Recall Management
● How often to migrate?● What data should be migrated?
● Which volumes? How old? What criteria?● How long is the migrated copy retained?● How is the data recalled?
● Explicit recall? Recall by reference?
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DFSMShsm Migration Process
DFSMShsm
Select if MC requires
Deletedataset
Create migr copy(s)
OCDSMCDS
Dataset info
tape vol info
Journal
SMS SG AttributesorDFSMShsm Non-SMS Attributes
PRIMARYBACKUPDUMPMIGRATION
Automatic Primary Space Mgmt or Command Migrationz/OS Catalog MIGRAT
ML1/
SDSP
Automatic Secondary Space Mgmt or Command Migration
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DFSMShsm Space Management
Space Management Functions● Migrate, extent reduction, release, expire
● Automatic Primary Space Management● Automatic Secondary Space Management● Command Space Management● Other
● Interval migration● On-demand migration● Fast Subsequent Migration
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DFSMShsm Space Management
Space Management Windows and Settings
Space Management Commands
DEFINE PRIMARYSPMGMTCYCLE (YYYYYYY CYCLESTARTDATE(YYYY/MM/DD))SETSYS PRIMARYSPACEMANAGEMENTSTART(hhmm hhmm)SETSYS MAXMIGRATIONTASKS(nn)SETSYS MAXEXTENTS(nn)
SETSYS SECONDARYSPACEMANAGEMENTCYCLE (YYYYYYY) CYCLESTARTDATE(yyyy/mm/dd))SETSYS SECONDARYSPMGMTSTART(hhmm)SETSYS MAXSSMTASKS (CLEANUP(2) TAPEMOVEMENT(1))SETSYS SMALLDATASETPACKING(KB(110))
HMIGRATE dsn ML2 MIGRATE DSN/VOLUMEDELETE dsn
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Locating the Migration Copy
● DFSMShsm– H(LIST) dsn MCDS
● FDRABR– PGM=FDRABRP, PRINT ARCHIVE
– ISPF panels
– FDREPORT
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Automatic RecallDFSMShsm and FDRABR
MY.DATA.SET TAP001
//DD1 DD DSN=MY.DATA.SET...
z/OS Catalog
MY.DATA.SET MIGRAT
MCDS/ACF
TAP001
Catalog LOCATE requests volserIGG026DU
DFSMShsmFDRABRfront-end
SVC 26
Determine if migrated Dataset is referred to.
Obtain migr info
DFSMShsm / FDRABR attached
Dataset restored And recatalogued
DTS001
MY.DATA.SET
DTS001
Correct volume returned
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FDRABR Archive Process
FDRABR
Select if ABR requires
Deletedataset
Create migr copy(s)
ArchiveControl
File
Dataset info
tape vol info
SMS SG AttributesorABR Model DSCB
// EXEC PGM=FDRABRDUMP TYPE=ARC, ADAYS=MOUNT VOLG=, STORGRP=z/OS Catalog MIGRAT
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FDRABR Selection Criteria
● SMS Selection Criteria– Management Class Migration Attributes
– Management Class Expiration Attributes optional
● FDRABR Selection Criteria– ADAYS, IFNOTCAT, EXPIRED, MAXGDG, DSN
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FDRABR Selection Criteria
● SMS Selection Criteria– Management Class Migration Attributes
– Management Class Expiration Attributes optional
● FDRABR Selection Criteria– ADAYS, IFNOTCAT, EXPIRED, MAXGDG, DSN
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FDRABR Space Management
● Migration– DUMP TYPE=ARC
● Deletion– DUMP TYPE=SCR
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FDRABR Archive Expiration● All datasets on archive file expire together
(usually)● Tape expiration via:
– EXPDT/RETPD in JCL (date or catalog control)
– RETPD in SYSIN
– FDROPT default ● Archive Control File expiration
– Usually = tape expiration
– Unless SMSEXPIRE=YES
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DFSMShsm vs. FDRABR
DEFINE / SETSYS
BCDS
MCDS
OCDS
Functions, Commands
(H)LIST
FDROPT / SYSIN
ABR Catlg/DSCB/Model
Archive Control File
ABR Catalog
PGM=, SYSIN
FDREPORT/FDRABRP
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More Topics...● Management of non-SMS data● Disk-to-Disk Data Movement● Volume Defragmentation● Flashcopy and FDRINSTANT● CDS Backup, ACF Maintenance, Recycle● Application Backup and ABARS● Report Writing● Serialization, Security, Standalone restore
and much more...
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Further Reading and Documentation
● IBM z/OS DFSMShsm Primer● http://www.redbooks.ibm.com/redbooks/SG245272
● DFSMShsm Storage Administration Reference– http://publibz.boulder.ibm.com/cgi-
bin/bookmgr_OS390/BOOKS/DGT2S6A0/CCONTENTS?SHELF=DGT2BKB0&DN=SC35-0421-12&DT=20110618155526
● FDR System User's Guide, C & F Guides● ftp://ftp.fdrinnovation.com/Public/MANUALS/
–
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Questions?
Share Technology ExchangeBooth 200
[email protected] x162
Verity Systems, Inc
FDR Training and Advice
www.veritysys.com