This material, that I am prsenting to several customers, shows an issue on z/OS still causing pain to customers. Too many job abends in the z/OS daily batch workload generate a lot of CPU consumption and often cause delays in the batch scheduling. Being proactive on this means saving time and money. A special thank for the help with this tool and with its material goes to Joris Cornette, a great Rocket Software colleague with a strong technical profile, feferenced in ZoomInfo: http://www.zoominfo.com/p/Joris-Cornette/1531425025

1. IBM Systems
© 2015 IBM Corporation
IBM zMiddleware
IT Service Management
Proactive Batch Space Abends Handling
on z/OS with TAAM
(Tivoli Advanced Allocation Management)
Domenico Chillemi
Executive IT Specialist
nicochillemi@it.ibm.com

2. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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

3. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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

4. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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 time
DEFAULTS 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

5. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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 time
DEFAULTS 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 ADMIN
INCLUDE GROUPID=ADMIN
SEC_ALLOC_AMT=99

6. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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 time
DEFAULTS 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

7. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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 time
DEFAULTS 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 member
INCLUDE JOBNAME=SAP*
VOL_ADD_VGRP=(VGMV)
* Define the group
GROUP_NAME=VGMV
VOLUMES=(MVL*)

8. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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 time
DEFAULTS 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=SC78
INCLUDE STORCLASS=SC78
PRIM_REDUCE_LIM=(,50)
PRIM_REDUCE_INC=(,25)

9. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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 time
DEFAULTS NOTCAT2=JCLFAIL
NOTCAT2_CHECK=STEPTERM
* Scratch existing datasets for Storage classes SC21 ZC21
INCLUDE STORCLAS=*C21
NOTCAT2=SCRATCH
* Uncatalog existing dataset if first qualifier is „P“
INCLUDE DSNAME=P.*
NOTCAT2=UNCATALOG

10. IBM Systems
© 2015 IBM Corporation
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* RULE DEFINITIONS
* Default settings
DEFAULTS PDS_DIR_INC=ENABLE
* Item to include in processing
INCLUDE JOBNAME=ABCJOB1
* Disable automatic PDF increase
PDS_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

11. IBM Systems
© 2015 IBM Corporation
zMiddleware ITSM
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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

12. IBM Systems
© 2015 IBM Corporation
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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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© 2015 IBM Corporation
zMiddleware ITSM
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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 Page
http://www-03.ibm.com/software/products/en/tivoadvaallomana
 Information
http://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_sm/5
 IBM Publications
http://www-01.ibm.com/support/knowledgecenter/SSFLUS_3.3.0/com.ibm.advanced

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© 2015 IBM Corporation
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Thank You