PH18199: THE IIDR CDC FOR Z/OS META-DATA VSAM CLUSTER MAY BE CORRUPTED DURING FAILOVER ACTIVITY.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The IIDR CDC for z/OS Meta-data VSAM cluster has
  SHROPTIONS(3,3) coded. This permits shared use of the cluster
  between different FailOver instances, but does not provide
  protection should there be any possiblity of overlapping
  accesses between different instances. Given the purpose and use
  of the Meta-data VSAM cluster, such overlapping accesses are
  not expected to occur. This window of opportunity should be
  eliminated.
  

Local fix

• Until a permanent resolution is provided, this issue can be
  avoided by allocating a DD:CHCMTDTA VSAM cluster for each
  instance being used in a FailOver configuration.  If the name of
  the VSAM cluster contains the &SYSNAME system symbol, a single
  JCL procedure can be used to allocate the corresponding cluster
  for each instance.  This will require that any Alerts and Alarms
  settings be made on one system, and then the contents of that
  system's DD:CHCMTDTA VSAM cluster be copied over to the other
  cluster(s).  Once a resolving PTF is available, this local fix
  can be abandoned, and the use of a single DD:CHCMTDTA VSAM
  cluster restored.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of IIDR CDC for z/OS who configure it  *
  *                 to run in a FailOver configuration.          *
  ****************************************************************
  * PROBLEM DESCRIPTION: The DD:CHCMTDTA VSAM cluster is used by *
  *                      multiple instances of IIDR CDC for z/OS *
  *                      in a FailOver configuration.  Although  *
  *                      they do not access the VSAM cluster     *
  *                      concurrently, incidents of corruption   *
  *                      of the VSAM cluster have occurred.  A   *
  *                      means of serializing access to the VSAM *
  *                      cluster is required.                    *
  ****************************************************************
  * RECOMMENDATION: APPLY CORRECTIVE SERVICE                     *
  ****************************************************************
  
  The DD:CHCMTDA VSAM cluster may be corrupted in a FailOver
  configuration.
  

Problem conclusion

• The VSAM SHAREOPTIONS for the DD:CHCMTDTA VSAM cluster have been
  changed from (3,3) to (2,3), and serialization services are now
  used when accessing the data in the VSAM cluster.
  

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:

  UI74769

Modules/Macros

•    CHCATHDL CHCATHSW CHCDB2DL CHCDFMTD CHCDSCDB
  CHCDSCPF CHCPAAUT CHCPALDL CHCPALGP CHCPALIQ CHCPALMD CHCPALMS
  CHCPALOG CHCPALPF CHCPALRP CHCPALUT CHCRSSSV CHCRSSSW HCHCA21J
  

Fix information

• Fixed component name

  INFO SRVR CDC Z

• Fixed component ID

  5655U7600

Applicable component levels

• RA21 PSY UI74769

     UP21/04/13 P F104

Fix is available

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