IBM Support

PH07647: LOG INFORMATION ABOUT CAUSE OF HIGHAVAILABILITY TAKEOVER

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APAR status

  • Closed as program error.

Error description

  • The WebSphere Application Server Load Balancer for IPv4 and
    IPv6 should record information about the cause of a
    highavailability takeover.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  IBM WebSphere Load Balancer for IPv4 and    *
    *                  IPv6 users                                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: Provide reason for takeovers when a     *
    *                      high availability failover occurs.      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The High Availability feature enables the backup to takeover
    when necessary but often the reason for the takeover is
    unknown.
    The user can find the reason for the takeover after applying
    this change.
    

Problem conclusion

  • When using the load balancer for ipv4 and ipv6, information is
    recorded in different locations depending on the operating
    system. The reason for a high availability takeover is
    recorded on the load balancer which assumed the active
    forwarding role and can be searched for based upon the string
    "HA TAKEOVER".
    
    On Windows, this information is recorded in the ibmlb2.log
    found in the dispatcher logs directory. The operating system
    may not show data in this log until the executor is stopped.
    
    On Linux, this information is recorded in /var/log/messages.
    
    On AIX, this information was previously stored in memory and
    could only be viewed if extracted from the executor using
    executor trace formatting and if extracted before the trace
    buffer filled and was overwritten. With this change, the
    information is written to syslog. It is written based upon
    KERN facility and with priority NOTICE; The syslog.conf should
    be updated to include this reporting if it is desired.
    
    Fix included in fixpacks 8.5.5.16 and 9.0.0.11.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH07647

  • Reported component name

    WS EDGE LB IPV4

  • Reported component ID

    5724H8812

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-01-24

  • Closed date

    2019-01-31

  • Last modified date

    2019-01-31

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

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

Fix information

  • Fixed component name

    WS EDGE LB IPV4

  • Fixed component ID

    5724H8812

Applicable component levels



Document information

More support for: WebSphere Application Server
Edge Component

Software version: 8.5

Reference #: PH07647

Modified date: 31 January 2019