PH56287: ADVISORS DO NOT RUN THE STANDBY LOAD BALANCER.

APAR status

• Closed as program error.

Error description

• When a standby Load Balancer assumes the active forwarding
  role, advisors start to monitor the server health. Traffic may
  be forwarded to an unavailable server after a takeover occurs
  if the advisor has not detected the server is unavailable when
  server selection occurs for the connection.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  IBM WebSphere Application Server Edge Load  *
  *                  Balancer users with High Availability       *
  *                  configured                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: Requests may be forwarded to an         *
  *                      offline server after a high             *
  *                      availability failover.                  *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When Load Balancer is configured with high availability, the
  active LB monitors the health of the servers and the standby
  LB does not. When a takeover occurs, the standby LB becomes
  the active LB and starts to forward traffic and monitor the
  backend servers health. The current status of the backend
  servers will not be accurate until the health has been
  evaluated by LB's advisors. If a backend server is offline,
  requests may be forwarded to the server during this time.
  

Problem conclusion

• The code has been changed such that both active and standby
  Load Balancers monitor the health of the backend servers.
  Since the health is monitored by the standby LB, requests will
  not be forwarded to an offline server when a high
  availability failover occurs. Additionally, "dscontrol file
  report" can also now be successfully generated on the backup
  load balancer.
  
  
  This change is included in fixpack levels:
     8.5.5.25
     9.0.5.19
  

Temporary fix

Comments

APAR Information

• 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