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IC68697: FCM SENDER IS NOT SELECTING DESIGNATED NETWORK INTERFACE TO SEND DATA

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APAR status

  • Closed as program error.

Error description

  • If multiple network interfaces are available on a machine with
    multiple logical partitions (MLNs), and each logical partition
    is specified to use a designated network interface for
    inter-partition communication (ie, via the netname column in
    db2nodes.cfg), DB2 may not choose the designated network
    interface to send data across partitions; it would instead let
    the operating system (OS) choose interfaces that are deemed
    appropriate to use.  Depending on the actual workloads, this
    behavior can potentially be suboptimal for send traffic if the
    OS chose a single interface (or only a small subset) for all
    logical partitions rather than fully utilizing all available
    ones.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All of these criteria must be present for the problem to     *
    * occur:                                                       *
    * - DPF                                                        *
    * - MLNs                                                       *
    * - multiple network interfaces on a machine                   *
    * - user configured each logical partition to use a different  *
    * network interface (ie, via the netname column in             *
    * db2nodes.cfg).                                               *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * If multiple network interfaces are available on a machine    *
    * with                                                         *
    * multiple logical partitions (MLNs), and each logical         *
    * partition                                                    *
    * is specified to use a designated network interface for       *
    *                                                              *
    * inter-partition communication (ie, via the netname column in *
    *                                                              *
    * db2nodes.cfg), DB2 may not choose the designated network     *
    *                                                              *
    * interface to send data across partitions; it would instead   *
    * let                                                          *
    * the operating system (OS) choose interfaces that are deemed  *
    *                                                              *
    * appropriate to use.  Depending on the actual workloads, this *
    *                                                              *
    * behavior can potentially be suboptimal for send traffic if   *
    * the                                                          *
    * OS chose a single interface (or only a small subset) for all *
    *                                                              *
    * logical partitions rather than fully utilizing all available *
    *                                                              *
    * ones.                                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to v97fp3 or later.                                  *
    ****************************************************************
    

Problem conclusion

  • Problem was first fixed in v97fp3.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC68697

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-05-18

  • Closed date

    2010-09-16

  • Last modified date

    2010-09-16

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

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

    IC68775

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R910 PSN

       UP

  • R950 PSN

       UP

  • R970 PSN

       UP

  • R980 PSN

       UP

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSEPGG","label":"DB2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.7","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
10 September 2020