OA62098: NEW OPTIONS TO SET MINIMUM CSA THRESHOLD AND DISABLE TCP/IP PROCESSING ZDMF/K

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When SERVER_IPADDR=(0) is specified, zDMF disables its TCP/IP
  functions, but still attempts some initialization processing
  that can cause unnecessary error messages.  This happens in
  particular when there is no USS segment defined for the userid.
  
  zDMF checks for a minimum of 10% free ECSA storage, or it
  refuses to process.  In some cases, where ECSA allocation is
  large and heavily utilized, this can be an unnecessary barrier.
  A new option MINIMUM-ECSA_FREE=10% will be added to allow users
  to modify this threshold to suit their environment.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: zDMF fails to activate a group if ECSA  *
  *                      free storage goes below 10%.  This      *
  *                      is hard-coded, but may not always be    *
  *                      appropriate.                            *
  *                      Even when SERVER-IP=(0) is specified,   *
  *                      zDMF attempts to use TCPIP services,    *
  *                      and this can cause unnecessary error    *
  *                      messages.                               *
  ****************************************************************
  * RECOMMENDATION: Apply the provided PTF.                      *
  ****************************************************************
  zDMF has a hard-coded threshold of a minimum 10% free ECSA or it
  fails to activate a group.  This can be a problem when a large
  ECSA is allocated, and 10% is actually plenty of storage for
  zDMF to work.
  
  Many users deactivate zDMF TCP/IP funtionality, as it is not
  needed.  However, the TCP/IP subtask runs anyway, and
  periodically calls TCP/IP services.  In some cases, this can
  lead to continual error messages, and it's unnecessary overhead
  anyway.
  

Problem conclusion

• A new configuration parameter is added (MIN_FREE_ECSA%) that
  allows the user to override the default of 10%.  The allowed
  specification can be from 0-80%.  There is still one more check
  for the absolute required storage for an activation.
  
  When SERVER-IP=(0) is specified, zDMF will no longer attempt
  any TCP/IP calls, and will end the TCP/IP communications
  subtask.
  

Temporary fix

Comments

• ×**** PE21/11/02 FIX IN ERROR. SEE APAR OA62378  FOR DESCRIPTION
  

APAR Information

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

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

  UJ06933

Modules/Macros

• GZDGECSA GZDMAIN  GZDMSGN  GZDMSGV  GZDTC01
  

Fix information

• Fixed component name

  ZDMF

• Fixed component ID

  ZDMF00001

Applicable component levels

• R341 PSY UJ06933

     UP21/10/28 P F110

Fix is available

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