PH29093: MQ: NETTIME FOR A CHANNEL CONNECTING TO A Z/OS V9.1.0 QUEUE MANAGER HAS INCORRECT VALUES

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• With MONCHL set to LOW, MEDIUM, or HIGH, the DISPLAY
  CHSTATUS(channel-name) MONITOR command sometimes shows
  extremely high NETTIME values for channels connecting to a z/OS
  9.1.0 queue manager.
  
  The problem is more likely to occur with higher volumes of
  messages.  So far, it has been observed with Linux and Windows
  senders, although it might occur in other environments.
  
  The problem does not affect the operation of the channel but
  does give misleading values for NETTIME.
  
  The problem can be recreated with regularity by setting the
  channel with MONCHL(HIGH) and BATCHSZ(10), putting 60 messages
  with the channel inactive, and then starting the channel.
  
  During periods of low message activity, the NETTIME values look
  more reasonable.
  
  rriConfirmAccept needs a fix similar to the one made by APAR
  PH13648 in rriConfirm for z/OS sender channels.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: When a distributed QMGR connects to a   *
  *                      z/OS QMGR with channel monitoring       *
  *                      enabled, issuing a DISPLAY CHSTATUS may *
  *                      result in unusually high values for the *
  *                      NETTIME field.                          *
  *                                                              *
  *                      If the connection instead originates    *
  *                      from a z/OS QMGR, then the NETTIME      *
  *                      field may not be updated.               *
  ****************************************************************
  A sporadic error in the receiver code causes the calculation of
  the elapsed time to be larger than expected. This in turn
  results in an elapsed time greater than the total time being
  returned to the sender side. The distributed QMGR code fails to
  notice this and subsequently calculates a negative value for the
  NETTIME, which is interpreted as a large positive number by
  DISPLAY CHSTATUS.
  

Problem conclusion

• The receiver code has been corrected to calculate the correct
  value for the elapsed time.
  

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:

  UI71661

Modules/Macros

• CSQXCCAX CSQXREXT CSQXRMRC
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI71661

     UP20/10/13 P F010

Fix is available

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