PH66067: GDPS_CHECK_CONFIG healthcheck ABEND0C4 or potential common storage overlay

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• GDPS Healthcheck GDPS_CHECK_CONFIG could fail with
  ABEND0C4 PIC10 in module VPC8C013 at offset D698.
  
  This is most likely to occur in systems that use the
  IBM Disk Subsystem Consistent Read from secondary feature,
  as GDPS_CHECK_CONFIG checks for consistent definitions of the
  IOS parms required to enable this feature across the syslpex.
  
  HIPER symptom:
  
  There is also a rare timing window whereby a one bit overlay
  of common storage can occur at an unpredictable location
  when GDPS attempts to record the results of the check in its
  control block.
  
  Additional symptom:
  
  GDPS_CHECK_CONFIG might fail to report or erroneously report
  exceptions GEOH126E or GEOH127E which alert to inconsistent
  IOS settings.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: GDPS Metro                                   *
  ****************************************************************
  * PROBLEM DESCRIPTION: GDPS_CHECK_CONFIG healthcheck ABEND0C4  *
  *                      or potential common storage overlay     *
  ****************************************************************
  GDPS Healthcheck GDPS_CHECK_CONFIG uses a dedicated XCF exit
  routine to maintain a sysplex level awareness of the definition
  consistency of several IOS parameters (like Consistent Read
  from Secondary).
  
  Under some circumstances this XCF routine could execute at
  a time when GDPS Control Block addressing has not been
  properly established.
  
  There is small timing window that could result in a one bit
  storage overlay in common storage at an unpredictable location.
  
  Other possible results are an ABEND in the XCF exit routine or
  simply an inaccurate check result.
  

Problem conclusion

• This PTF corrects the reported problems.
  
  ACTION REQUIRED
  
  This PTF updates GDPS Health Check load module VPC8C013 for
  GDPS_CHECK_CONFIG. For information on the actions required
  to implement this change, See the Technote at the following URL:
  http://www-01.ibm.com/support/docview.wss?uid=swg21959594
  
  KEYWORDS: GDPSMETRO/K
  

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:

  UO05445 UO05447 UO05448

Modules/Macros

• VPC8C013
  

Fix information

• Fixed component name

  GDPS

• Fixed component ID

  694235B00

Applicable component levels

• R460 PSY UO05448

     UP25/10/22 P F510 ¢

• R470 PSY UO05447

     UP25/10/22 P F510 ¢

• R480 PSY UO05445

     UP25/10/22 P F510 ¢

Fix is available

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