proactive batch space abends handling on z/os with tivoli advanced allocation management
TRANSCRIPT
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© 2015 IBM Corporation
IBM zMiddlewareIT Service Management
Proactive Batch Space Abends Handlingon z/OS with TAAM
(Tivoli Advanced Allocation Management)
Domenico ChillemiExecutive IT [email protected]
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The allocation issue with z/OS batch processing
TWS for z/OS Current Plan must be completed on time every day – Normally batch processing is supposed to end on time in order to fit service
level agreements
What happens to Plan completion if affected by allocation issues?– It can easily happen that some batch jobs end in error due to space
unavailability
– Often this is due to wrong batch application settings
– Successors of these jobs cannot start and the plan remains uncompleted
– Automation can try a restart, but if space is not available these jobs still end in error
– TWS Automatic Job Recovery can be used, but does not solve the permanently the problem
– Multiple and unuseful runs cause higher CPU consumption
It would be nice if batch space issues could be proactively managed
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Introduction to the issue solution Space related abends Sx37
– Are a very common situation in batch processing– Have a very disruptive impact for Service Level Agreements and deadlines
Here is a non-exhaustive List of Typical Error Situations:1. Amount of Primary Space asked for is not available
2. Secondary Space is needed but not defined
3. Amount of Secondary Space asked for is not available
4. The current volume is out-of-space and more volumes are needed
5. Set rules for the allocation of space on the additional volumes
6. Duplicate Catalog Entry
7. Dynamic PDS members directory increase
TAAM works with a rule-based mechamism:– Set the default handling rules for the enabled error situations– Define up to 30 filters for datasets to be intercepted by TAAM
• With individual handling rules and overrides of the defaults
High productivity when TWS and TAAM work together
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Feature 1: primary space reduction
Purpose: reduce primary allocation if it would cause an x37 abend
TAAM can reduce the value to a certain limit, in several steps
* Defaults if not overruled at selection timeDEFAULTS PRIM_REDUCE=ENABLE PRIM_REDUCE_LIM=50 * Reduce until 50% PRIM_REDUCE_INC=10 * Reduce by 10% until limit* Reduce with 5% for Storage Class SC14 and if first* qualifier of DSN is „NDV“ INCLUDE STORCLAS=SC14 DSNAME=NDV.* PRIM_REDUCE_INC=05
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Feature 2: definition of a missing secondary allocation
Purpose: allocate a secondary allocation if its absence would cause an x37 abend
TAAM can define a secondary allocation, in function of the primary
* Defaults if not overruled at selection timeDEFAULTS SEC_ALLOC=ENABLE SEC_ALLOC_AMT=40 * Sec = 40% of Prim * Override for STEPNAME CA11 INCLUDE STEPNAME=CA11 SEC_ALLOC=DISABLE * Override for jobs with RACF Group ID ADMININCLUDE GROUPID=ADMIN SEC_ALLOC_AMT=99
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Feature 3: secondary space reduction
Purpose: reduce secondary allocation if it would cause an x37 abend
TAAM can reduce the value to a certain limit, in several steps
* Defaults if not overruled at selection timeDEFAULTS SEC_REDUCE=ENABLE SEC_REDUCE_LIM=10 * Reduce sec until 10% SEC_REDUCE_INC=10 * Reduce sec by 10% until limit* Reduce until 25% for Storage Class SC78* and if Job Name starts with „P“ INCLUDE STORCLAS=SC78 JOBNAME=„P*“ PRIM_REDUCE_LIM=25
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Feature 4: addition of additional volumes
Purpose: add a new volume when the current volume is out-of-space
TAAM can direct the allocation to a certain group of volumes
* Defaults if not overruled at selection timeDEFAULTS VOL_ADD=ENABLE VOL_ADD_LIMIT=3 VOL_ADD_VSER=(DASD01,DASD02,DASD03,DASD04)* For datasets in Storage Class SCMV, use volume group VGMV* A group is defined in another TAAM rule memberINCLUDE JOBNAME=SAP* VOL_ADD_VGRP=(VGMV)
* Define the group GROUP_NAME=VGMV VOLUMES=(MVL*)
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Feature 5: definition of space on additional volumes
Purpose: set the size of the primary allocation when a new volume is used
TAAM can set the values for the allocation on the new volume
* Defaults if not overruled at selection timeDEFAULTS PRIM_REDUCE=(,ENABLE) PRIM_REDUCE_LIM=(,10) * Reduce size on new vol until 10% PRIM_REDUCE_INC=(,10) * Reduce on new vol by 10% until limit* Reduce with 25% for Storage Class SC78 and DSORG is not PO* until 50% of value on first volume EXCLUDE DSORG=PO STORCLASS=SC78INCLUDE STORCLASS=SC78 PRIM_REDUCE_LIM=(,50) PRIM_REDUCE_INC=(,25)
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Feature 6: Duplicate Catalog Entries
Purpose: handle duplicate dataset names (NOT CATLGD 2 Management)
TAAM has different ways to support this: do nothing - scratch the old one - uncatalog but and keep the old one – deletion of the older data set to make unique the last allocated one
– force of JCL error when a duplicate allocation happens
* Defaults if not overruled at selection timeDEFAULTS NOTCAT2=JCLFAIL NOTCAT2_CHECK=STEPTERM* Scratch existing datasets for Storage classes SC21 ZC21INCLUDE STORCLAS=*C21 NOTCAT2=SCRATCH* Uncatalog existing dataset if first qualifier is „P“ INCLUDE DSNAME=P.* NOTCAT2=UNCATALOG
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* RULE DEFINITIONS* Default settingsDEFAULTS PDS_DIR_INC=ENABLE
* Item to include in processingINCLUDE JOBNAME=ABCJOB1
* Disable automatic PDF increasePDS_DIR_INC=DISABLE
Feature 7: dynamic PDS directory increase
Purpose: increase partitioned directory blocks when not available– Avoid to use offline IEBCOPY to allocate a PDS with more directory blocks
TAAM can increase automatically the space for PDS directory when needed
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Tivoli Advanced Allocation Manager Architecture
Runs as a started task
Sets intercepts (hook points) into allocation and end-of-volume during production initialization
Basic product-control options are specified in a PDS control member called an OPTIONS member
“What to process" and "what to do" are specified in a PDS control member called a RULEDEFS member
User can communicate with product through supplied ISPF dialog or supported operator commands
Overview statistics can be viewed via the dialog
Detailed statistics can be obtained and reported by requesting SMF recording and reporting on them using a supplied reporting utility
Multiple instances of product can be run on an MVS image together
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Minor functions available in TAAM Storage related functions
– Reduce the size of the secondary extent to the largest available on the volume
– Write an End-Of-File marker on newly allocated datasets
– Release unused space when closing a dataset
– More …
System related functions
– Trace and diagnose the logic that leads to the applied rule
– Configure message handling
– Check syntax of rules before their activation
– ISPF interface• Enables/Disables TAAM• Activation of new rules• RACF integration• Statistics• SMF logging of TAAM actions
• SMF detailed reporting
– Console commands
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Primary Panel of TAAM
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TAAM Statistics
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TAAM Audit Trail
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TAAM is TEP enabled
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Useful Material
Support Pagehttp://www-03.ibm.com/software/products/en/tivoadvaallomana
Informationhttp://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_sm/5/897/ENUS5697-P35/index.html&lang=en&request_locale=en
IBM Publicationshttp://www-01.ibm.com/support/knowledgecenter/SSFLUS_3.3.0/com.ibm.advancedallocationmgt.doc_3.3/welcome.html
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Thank You