PJ40836: ISSUE WITH USING NTP/STP TIMER SUPPORT

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APAR status

  • Closed as program error.

Error description

  • See Problem Summary.
    

Local fix

  • na
    

Problem summary

  • APAR NUMBER:  PJ40836
    PRODUCT:  z/TPF
    FUNCTIONAL AREA:  CLOCKS
    SHIPPED IN PUT:  10
    
    ABSTRACT:
    Due to the special STP configuration APAR PJ39209, the TOD
    clock on a processor in a loosely coupled complex may not be
    confirmed.
    
    PACKAGE CONTENTS:
    Source Segments:
    (C) hpo/rt/cqak.asm
    
    Object Only Binaries:
    None.
    
    Configuration Independent Binaries:
    (C) hpo/obj/cqak.o
    (C) hpo/load/CQAK.so
    
    Support Files:
    hpo/lst/cqak.lst
    hpo/lst/CQAK.map
    
    OTHER BINARIES TO BUILD: NO
    None.
    
    COMMENTS:
    When the special STP configuration is used in a loosely coupled
    complex, there is only one processor whose entry in keypoint I
    (CTKI) shows that its TOD clock is confirmed. The processor
    where ZATIM xxxx TOD GOOD SSTP was input shows as TOD clock
    confirmed. The CTKI entry for all other processors show that
    the TOD clock is not confirmed.
    
    The processor where ZATIM xxxx TOD GOOD SSTP is input is the
    TOD clock master processor.
    
    When a processor in the loosely coupled complex is IPLed, the
    TOD clock must be confirmed. When the special STP configuration
    is used and when the CTKI entry for the IPLing processor does
    not show TOD clock confirmation, a SIPCC is done to all other
    processors in the complex requesting TOD clock confirmation.
    Because the TOD clock master processor is the only processor
    whose CTKI entry shows TOD clock confirmed, only the TOD clock
    master processor responds to the SIPCC request.
    
    If the TOD clock master processor is taken out of the complex
    and another processor IPLs, no processor will respond to the
    SIPCC request for TOD clock confirmation. As a result the
    processor that is IPLing will stop is restart waiting for TOD
    clock confirmation. In order to allow the processor to continue
    in restart, the operator will need to do ZATIM xxxx TOD GOOD
    SSTP BP on the processor. As a result the TOD clock master
    processor will change.
    
    When the special STP configuration is used, all processors in
    the loosely coupled complex should be shown as TOD clock
    confirmed in CTKI. This will eliminate the problem of having to
    do a ZATIM xxxx TOD GOOD SSTP BP when a processor is IPLed and
    the master TOD processor is not in the loosely coupled complex.
    

Problem conclusion

  • SOLUTION:
    Program CQAK has been updated. The purpose of the change is to
    show the TOD clock as confirmed in CTKI for all processors and
    not just the TOD clock master processor.
    
    When the special STP configuration is used and a processor
    IPLs, a SIPCC is sent to all processors. When a response is
    received from a processor whose TOD clock is confirmed, program
    CQAK is entered. CQAK has been changed to not set indicator
    "incompatible with sync source" (SC0TACC) if the special STP
    configuration is in use. Because SC0TACC is not set CQAK will
    updates CTKI to show that this processor's TOD clock is
    confirmed.
    
    COREQS: NO
    None.
    
    MIGRATION CONSIDERATIONS: NO
    None.
    
    BUILD COMMANDS AND INSTRUCTIONS: YES
    #maketpf commands for linux
    maketpf -f CQAK cqak.o
    maketpf CQAK link
    
    UPDATED INFORMATION UNITS: NO
    None.
    
    See your IBM representative if you need additional information.
    
    DOWNLOAD INSTRUCTIONS:
    http://www.ibm.com/software/htp/tpf/maint/maintztpf.html
    
    APAR URL:
    http://www.ibm.com/software/htp/tpf/ztpfmaint/put10/PJ40836.htm
    

Temporary fix

Comments

APAR Information

  • APAR number

    PJ40836

  • Reported component name

    Z/TPF

  • Reported component ID

    5748T1501

  • Reported release

    110

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-02

  • Closed date

    2013-01-09

  • Last modified date

    2013-01-09

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

    PJ40833

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

Fix information

  • Fixed component name

    Z/TPF

  • Fixed component ID

    5748T1501

Applicable component levels

  • R110 PSY

       UP



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Document information


More support for:

TPF
z/TPF

Software version:

110

Reference #:

PJ40836

Modified date:

2013-01-09

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