PH01416: EYUCS0207W CMAS1234 CONNECTED MAS CICS1234 IS NOT RESPONDING

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This is an issue we hit in our test environment. After
  recycling a 5.4 CMAS, the CMAS started up without issue and
  the Data Repository resynchronised without error.
  However, we noticed that a small number of CICS regions (MASes)
  were not responding :
  EYUCS0207W CMAS1234 Connected MAS CICS1234 is not responding
  
  EYUCS0207W CMAS1234 Connected MAS CICS5678 is not responding
  The related EYUCS0208I message took 20-30 mins and we can see
  no reason why it took this long.  The Testplex is relatively
  quiet on a Saturday afternoon and we could log onto the CICS
  regions.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICSPlex SM users.                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Message EYUCS0207W is issued in error.  *
  ****************************************************************
  * RECOMMENDATION: All CMAS regions must be restarted to        *
  *                 activate this fix. The restarts do not need  *
  *                 to occur at the same time.                   *
  ****************************************************************
  Two requests are sent from a CMAS to one of its MASes.
  The first allocates a PSID for the message, but then suspends
  while trying to allocate an SMTB since none are available.
  This allows the second request to allocate a higher PSID, and
  yet to be processed first.
  This does not cause any problem with the sending and receiving
  of messages, but allows the internal fields used to decide
  whether or not a MAS is responsive (CLCB_NRMAS_RR_SENT and
  CLCB_NRMAS_RR_RTND) to become inconsistent.
  If no further messages are sent from the CMAS to the MAS within
  the next two iterations of the non-responsive MAS testing
  interval, then the region can incorrectly be marked as
  non-responsive, leading to msgEYUCS0207W being issued.
  Note that non-responsive MAS testing occurs every sixty seconds.
  

Problem conclusion

• EYU0CTBT has been updated to avoid the inconsistency
  between CLCB_NRMAS_RR_SENT and CLCB_NRMAS_RR_RTND.
  

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:

  010PC2Ÿ UI57998 010PC2Ÿ 016AC4Ÿ PH36578

Modules/Macros

• EYU0CTBT
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R10M PSY UI57998

     UP18/08/23 P F808

Fix is available

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