PJ41139: PROVIDE TOD CLOCK VALIDATION MONITOR.

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APAR status

  • Closed as program error.

Error description

Local fix

  • n/a
    

Problem summary

  • APAR NUMBER:  PJ41139
    PRODUCT:  TPF4
    FUNCTIONAL AREA:  TOD CLOCK RPQ SUPPORT
    SHIPPED IN PUT:  26
    
    ABSTRACT:
    Provide TOD clock validation monitor.
    
    APAR CONTENTS:
    FEATURE   TYPE                STATUS    NAME
    HPO       C                   Changed   source/rt/hpo/ctdw.c
    
    PREREQUISITE APARS:  To be applied in order listed.
    HPO       C                   Changed   source/rt/hpo/ctdw.c
      PJ31088(21)
    
    COMMENTS:
    A need exists to determine if the time of day (TOD) clock is
    not synchronized between the processors in a loosely coupled
    complex.
    
    Currently, a TOD clock validation process exists. When a
    processor is IPLed, restart calls program CTDV and CTDV calls
    CTDW. CTDW gets the current TOD clock value (TOD value 1) and
    sends a SIPCC to all processors in the loosely coupled complex.
    The other processors will get their current TOD clock value
    (TOD value 2) and sends a SIPCC back to the requesting
    processor. On return to the originating processor, the current
    TOD clock value (TOD value 3) is obtained again. The three TOD
    clock values are compared. TOD value 1 must be less than TOD
    value 2 and TOD value 2 must be less than TOD value 3. If this
    is not true, then the TOD clock is not synchronized in the
    loosely coupled complex.
    
    The current TOD clock validation process in program CTDW is
    called only in restart. If an error happens when the processor
    is in norm state and the TOD clock loses synchronization, there
    is no monitor to report that the TOD clock is not synchronized.
    

Problem conclusion

  • SOLUTION:
    The current TOD clock validation process has been enhanced to
    be a monitor. Program CTDW continues to do the same TOD clock
    validation process except now this process is done every
    minute.
    
    In addition, if the TOD clock is no longer synchronized,
    warning message CTDV0005W now includes additional information.
    First, the amount of time that the TOD clock has not been
    synchronized is provided. Seconds, the three TOD clock values
    that were used in the compare is also provided. This added
    information provides an indication of how far out of synch the
    TOD clock is.
    
    The CTDV0005W warning message will be sent for the first five
    minutes after the loss of TOD synchronization is discovered.
    Afterwards, the message will be sent four times an hour or
    every 15 minutes.
    
    
    DEPENDENCIES
    
    SEGMENTS TO BE ASSEMBLED OR COMPILED:
    None.
    
    SEGMENTS TO BE LINK EDITED:
    ctdwh0.exe (Shipped in Tar File)
    
    COREQS:
    None.
    
    MIGRATION CONSIDERATIONS:
    None.
    
    UPDATED INFORMATION UNITS:
    None.
    
    See your IBM representative if you need additional information.
    
    DOWNLOAD INSTRUCTIONS:
    http://www.ibm.com/software/htp/tpf/pages/maint.htm
    

Temporary fix

Comments

APAR Information

  • APAR number

    PJ41139

  • Reported component name

    TPF 4.1

  • Reported component ID

    5748T1401

  • Reported release

    410

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-04-08

  • Closed date

    2013-05-09

  • Last modified date

    2013-05-09

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

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

Fix information

  • Fixed component name

    TPF 4.1

  • Fixed component ID

    5748T1401

Applicable component levels

  • R410 PSY

       UP



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Document information


More support for:

TPF

Software version:

410

Reference #:

PJ41139

Modified date:

2013-05-09

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