OA69221: REPRO TO EA VSAM CLUSTER WITH >20 CANDIDATES MAY EXPERIENCE LONG EXECUTIONS AFTER OA63441 APPLIED 26/03/12 PTF PECHANGE

APAR status

• Closed as program error.

Error description

• Error Description
  After OA63441, REPRO involving EA VSAM clusters containing
  greater than 20 candidate volumes may execute for a longer
  time frame with a higher amount of EXCPs.  The amount of
  volumes exceeds the capacity of a catalog workarea causing
  REPRO to operate with a default number of buffers (2)
  instead of a buffer number derived from the CI/CA of the
  data set.   In an extreme case where REPRO would otherwise
  operate with 180 buffers but does so with 2, this can cause
  a 5 minute REPRO job to execute 30 minutes or more.  This
  applies to both input and output.
  
  
  
  
  
  CATKEYS: IDC2026 IDCREPRO
  
  ANALYSIS:
  If APAR OA63441 applied and REPRO to an Extended
  
  Addressable VSAM cluster with greater than 20 candidate
  volumes executes longer than usual.
  
  F CATALOG,DUMPON(040,***,**) trap will produce a dump
  
  during REPRO execution
  
  KNOWN IMPACT:
  IDCAMS REPRO runs for greater clock time and EXCPs
  
  VERIFICATION STEPS:
  If APAR OA63441 applied and REPRO to an Extended
  
  Addressable VSAM cluster with greater than 20 candidate
  volumes executes longer than usual
  
  PE INFORMATION:
  USERS AFFECTED:
  
  APAR OA63441, PTFS UJ96783, or UJ96784 affects users of REPRO
  
  USER IMPACT:
  APAR OA63441 fixed the problem it reported but introduced a new
  problem.
  

Local fix

• STEPLIB to pre OA63441 SYS1.LINKLIB(IDCAMS).  Reduce candidate
  volumes on clusters. For DD allocation, add
  
  AMP=(AMORG,'BUFND=ddd') where ddd is comparable to the CI/CA
  of cluster (review listcat)
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DFSMS REPRO users of release V25 and     *
  *                 higher affected.                             *
  ****************************************************************
  * PROBLEM DESCRIPTION: After apply OA63441, REPRO had a        *
  *                      performance issue when REPRO a VSAM     *
  *                      data set which was EA and had more      *
  *                      than 20 volumes defined it.             *
  ****************************************************************
  It took a longer time for REPRO to be completed, because the
  buffer size passed on to OPEN was set incorrectly. The buffer
  was set incorrectly because a previous catalog call returned
  an error due to insufficient work area size. The error caused
  REPRO to branch out without setting the buffer size.
  

Problem conclusion

• Provide a large enough work area for the catalog call to
  prevent the initial error.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UJ99312 UJ99313 UJ99314

Modules/Macros

• IDCRP01
  

Fix information

• Fixed component name

  ACCESS METHOD S

• Fixed component ID

  5695DF103

Applicable component levels