IC89561: UNEVEN LOAD DISTRIBUTION WITH AMONGST MEMBERS OF AN AO SELF-BALANCING SERVICES

APAR status

• Closed as program error.

Error description

• When using the current AO-SB self-balancing algorithm of least
  connections, an uneven load distribution amongst members of an
  AO group may occur.
  
  This APAR adds a configurable option to employ a
  strict round-robin algorithm.
  

Local fix

Problem summary

• Affected are customers using multiple DataPower appliances with
  the AO option with self-balanced services in standby groups.
  
  For some traffic patterns, the load distribution between the
  members of the standby group may become uneven. In some cases
  that may lead to an overloaded group member going out of memory
  and restarting.
  
  The fix introduces new, more stable algorithms for load
  distribution and weight computation. The algorithms used are
  configurable now.
  

Problem conclusion

• The fix will be available in 4.0.2.13 and 5.0.0.8.
  
  For a list of the latest fix packs available, please see:
  http://www-01.ibm.com/support/docview.wss?uid=swg21237631
  

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

  DTAPWR B2B APL

• Fixed component ID

  DP905XB62

Applicable component levels

• R402 PSN

     UP

• R500 PSN

     UP