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PI07587: IWQ TRAFFIC IS SENT TO AN INCORRECT STACK WHEN THE OSA IS SHARED

A fix is available

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APAR status

  • Closed as program error.

Error description

  • IWQ data traffic is forwarded to an incorrect stack when the OSA
    card is shared between the sysplex distributor stack and the
    target stack.
    

Local fix

  • There are several workarounds for this problem:
    1. Disable IQDIO inbound workload queueing
    2. Take out the VIPAROUTE statement so that distributed traffic
    will be sent to the target stack via XCF link instead of the
    shared OSA
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users of the IBM Communications Server                   *
    * for z/OS Version 2 Release 1 IP:                             *
    * QDIO Inbound Workload Queueing (IWQ)                         *
    * for sysplex distributor (SD)                                 *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * TCP connection hangs after bulk data                         *
    * detected.                                                    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Apply PTF.                                                   *
    ****************************************************************
    An OSA card is shared between two TCPIP stacks.  One of the
    stacks is the distributor for a DVIPA and the other stack is
    a target for the DVIPA. The OSA is configured with QDIO
    Inbound Workload Queueing(IWQ) on both TCPIP stacks.  A TCP
    connection is distributed to the target stack.  TCPIP detects
    the connection is operating in bulk-data fashion and the
    connection is registered with the OSA. Future inbound
    packets are sent directly to the target. The target does
    not accept packets for distributed DVIPAs except
    from the distributor.  The packet is forwarded to the
    distributor, but the OSA redirects the packet to the
    target stack again.  This causes a loop forwarding the
    packet and the TCP connection hangs.
    

Problem conclusion

  • TCPIP is updated to accept packets for a DVIPA when the
    connection is established and in the dynamic VIPA connection
    routing table.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI07587

  • Reported component name

    TCP/IP V3 MVS

  • Reported component ID

    5655HAL00

  • Reported release

    210

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-12-06

  • Closed date

    2013-12-23

  • Last modified date

    2014-07-22

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

    PI05549

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

    UI13809

Modules/Macros

  • EZB6PINB EZBX6UT3 EZBXFUT3 EZBIPINB EZB2IUDR
    

Fix information

  • Fixed component name

    TCP/IP V3 MVS

  • Fixed component ID

    5655HAL00

Applicable component levels

  • R210 PSY UI13809

       UP14/03/04 P F403

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:
22 July 2014