OA41284: ALLOW EE XCA GROUPS TO BE DEFINED AND ACTIVATED WITH LARGE NUMBERS OF LINES.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Activating EE XCA groups with a large number of lines results
    in storage shortages.
    

Local fix

  • For nonCN groups, break the large GROUP definition into
    smaller GROUP definitions.
    To define a CN GROUP with 1000s of autogenned lines, apply
    the PTF for this APAR first.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All using Enterprise Extender connections.   *
    ****************************************************************
    * PROBLEM DESCRIPTION: EE GROUP defined with large             *
    *                      numbers of autogenned lines             *
    *                      fails during activation.                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Sample configuration:
    
    GPIP     GROUP DIAL=YES,ANSWER=ON,ISTATUS=INACTIVE,CALL=INOUT,
                   AUTOGEN=(10000,L,P),DYNPU=YES,VNNAME=IP.VRN1
    
    1) An EE GROUP was defined with an extremely large number of
       autogenned lines.
    2) The operator issued a V NET,ACT,ID=GPIP,ALL to activate all
       the lines defined under this group.
    3) Currently, VTAM initiates ACTLINK processing for all 10,000
       lines simultaneously.
    4) During ACTLINK processing at the line level, each line
       eventually goes into a WAIT state until the PORT performs
       some activation flows.
    5) This wait state causes an 8K CRA buffer to be suspended.
       This suspended PAB also allows another AUNCB (line) PU PAB
       to dispatch.
    6) The next AUNCB PU PAB does the same processing and goes into
       a WAIT state.
    7) This process repeats until the PORT dispatches and resumes
       the suspended AUNCB PU PABs.  If 1000s of lines are activated
       at once, ECSA could become exhausted due to CRA8K buffer
       requirements for this type of processing.  Depending on
       system ECSA availability, this may or may not be an issue on
       your system.
    
    NOTE: When larger number of EE nonCN lines are required, you can
          define multiple GROUPS each defining the same IPADDR.
          Each GROUP can be separately activated to "pace" the
          activation flows during startup.
    
          When defining a connection network (CN) GROUP, then all
          the lines must be defined under a single GROUP with the
          same IPADDR specified.  This APAR may be beneficial to
          you if you define more than 3000 lines in a single
          EE GROUP.
    

Problem conclusion

  • This APAR will add "pacing" logic to the activation flows
    to allow an EE GROUP defined with 3000 or more autogenned lines
    to activate more efficiently.  The intent of this new algorithm
    is to reduce the overall ECSA requirements currently required
    to activate a large EE GROUP definition.
    

Temporary fix

Comments

APAR Information

  • APAR number

    OA41284

  • Reported component name

    VTAM V4 MVS/ESA

  • Reported component ID

    569511701

  • Reported release

    1D0

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-25

  • Closed date

    2013-03-20

  • Last modified date

    2013-07-02

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

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

    UA68410

Modules/Macros

  • ISTACCGP ISTACCG1 ISTACCSB ISTAUCAL ISTAUCDL
    ISTAUCFT ISTAUCIS ISTAUCLA ISTAUCLF ISTAUCPF ISTAUCVR ISTAUNCB
    ISTAUVT  ISTDECK1 ISTIPNCB ISTNCSPL ISTRLN
    

Fix information

  • Fixed component name

    VTAM V4 MVS/ESA

  • Fixed component ID

    569511701

Applicable component levels

  • R1D0 PSY UA68410

       UP13/06/10 P F306

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


More support for:

z/OS family

Software version:

1D0

Operating system(s):

z/OS

Reference #:

OA41284

Modified date:

2013-07-02

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