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IT25373: CF MEMBER COMMUNICATION TIMEOUT LEADS TO CONNECTION RESET IMPACTING PERFORMANCE

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APAR status

  • Closed as fixed if next.

Error description

  • The following error is noticed in the db2diag.log to indicate an
    XI timeout:
    
    2018-05-23-15.55.16.840725+600 I334076216E684        LEVEL:
    Severe
    PID     : 17721                TID : 140109940778752 PROC :
    db2sysc 1
    INSTANCE: inst1             NODE : 001            DB   : TESTDB
    HOSTNAME: hostname
    EDUID   : 925                  EDUNAME: db2XInot GBP 1-0
    (TESTDB)
    1
    FUNCTION: DB2 UDB, RAS/PD component, pdLogCaPrintf, probe:876
    DATA #1 : <preformatted>
    do_dequeue: Timed-out waiting for completion of RDMA write of an
    link status buffer.  EP: 0x7f6e4c001ae0
    DATA #1 : <preformatted>
    If a CF return code is displayed above and you wish to get
    more information then please run the following command:
    
    If the timeout is on the Notification connection thread the
    following diag log message is observed
    
    2018-01-02-10.51.15.616046+060 I177825120E664        LEVEL:
    Severe
    PID     : 2931                 TID : 140189880018688 PROC :
    db2sysc 0
    INSTANCE: inst1             NODE : 000            DB   : TESTDB
    HOSTNAME: hostname
    EDUID   : 1240                 EDUNAME: db2LLMn12 (P2001) 0
    FUNCTION: DB2 UDB, RAS/PD component, pdLogCaPrintf, probe:876
    DATA #1 : <preformatted>
    do_dequeue: Timed-out waiting for completion of RDMA write of an
    link status buffer.  EP: 0x7f7ed01912d0
    DATA #1 : <preformatted>
    If a CF return code is displayed above and you wish to get
    more information then please run the following command:
    
    Upon checking networking, if no other reason for timeout is
    found, its likely the network being slow causing this issue.
    This fix allows for the timeout parameter to be tune-able for
    such cases.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * pureScale environment                                        *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Check "Problem Conclusion" section.                          *
    ****************************************************************
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT25373

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A50

  • Status

    CLOSED FIN

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-06-14

  • Closed date

    2018-06-20

  • Last modified date

    2018-06-20

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

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

Fix information

Applicable component levels

[{"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":"10.5","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
20 June 2018