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PI37189: ISPF PANEL SHOWS SHARED CHANNELS STATUS OF START. HOWEVER PF11 SHOWS THEM IN RUN. ALSO MQEXPLORER SHOWS THEM IN RUNNING STATUS.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • MQ panels shows shared channels status 'START' when PF11 shows
    them in RUN. Also MQExplorer shows them in RUNNING as well.
     This started after DB2 was unavailable and then became
    available shortly after. The following messages is issued every
    minute to the CHIN joblogs:
    CSQX478E - CSQXRCTL Channel xxx.TO.xxxx is active on AAAA,
               connection tag in use
    CSQX599E - CSQXRCTL Channel TQSG.TO.RBCTOQ02.POS ended
     The CSQX478E messages generated at regular intervals are caused
    by start commands issued internally by the CHIN supervisor
    because the DB2 SCST (Shared channel status table) shows that
    channels require restart but the start channel commands fail as
    the channels are already active. The shared channel status is
    not updated in the SCST when the start command fails.
    
     This APAR is raised to resync the DB2 shared channel status
    during a START channel command that finds that channel is
    already running.
    

Local fix

  • Stop the channel to STOPPED state and then manually start the
    channel. If the status changes to RUN it will clear the issue.
    If not, a restart of the queue manager will clear it.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ Version 8          *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: After a DB2 outage, shared channel      *
    *                      status shown in MQ ISPF panels and/or   *
    *                      DIS CHSTATUS command is "START" or      *
    *                      "STARTING" while local channel status   *
    *                      is "RUN" or "RUNNING".                  *
    *                                                              *
    *                      The CHIN is issuing a START CHANNEL     *
    *                      command to all shared channels in       *
    *                      "START" or "STARTING" status every 60   *
    *                      seconds. This command fails with        *
    *                      message CSQX478E indicating that the    *
    *                      channel is already running.             *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    A DB2 outage can prevent queue managers in a QSG to update the
    shared channel status in DB2 from "STARTING" to "RUNNING"
    causing the incorrect status displays and the CHIN to try to
    restart channels that are already running.
    

Problem conclusion

  • The Start channel command has been enhanced to synchronise the
    shared channel status in DB2 with the local channel status when
    the channel is running on the local queue manager.
    000Y
    CSQXRSER
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI37189

  • Reported component name

    WMQ Z/OS 8

  • Reported component ID

    5655W9700

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-03-17

  • Closed date

    2015-03-24

  • Last modified date

    2015-05-04

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

    PI36127

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

    UI26237

Modules/Macros

  • CSQXRSER
    

Fix information

  • Fixed component name

    WMQ Z/OS 8

  • Fixed component ID

    5655W9700

Applicable component levels

  • R000 PSY UI26237

       UP15/04/30 P F504

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
04 May 2015