IT27252: NOT ABLE TO FORM HADR CONNECTION AFTER TAKEOVER WHEN PURESCALE HADR STANDBY MEMBERS ON SAME HOST HAVE THE SAME HADR_LOCAL_SVC

APAR status

• Closed as program error.

Error description

• When using HADR feature in pureScale, it is possible to define
  the standby cluster with multiple members running on the same
  host. In such configuration, the HADR_LOCAL_HOST database
  configuration parameter is the same for these members. Their
  HADR_LOCAL_SVC database configuration parameter must be set to a
  different port value in order to avoid conflict.
  
  When HADR_LOCAL_SVC is set to the same value, this incorrect
  configuration is not detected when the database is activated as
  standby, because only one member of the standby cluster is
  activated. A wrongly such configured standby can still function,
  e.g. reach peer state. However, after HADR takeover, only one
  member of the new primary can listen on the configured port on
  that host. It would reject the connection request sent by the
  new standby when it detects it is for a different member. This
  unexpected rejection will cause the new standby database to
  terminate. Additionally, when attempting to activate the
  database on all members of the new primary cluster, some
  members will fail to be activated due to the port conflict.
  
  It is more desirable to detect the incorrect configuration and
  prevent the database to be activated as the standby.
  
  The following message in the db2diag.log of the new primary
  confirms that the new primary is rejecting the standby
  because it is for a different member than what the standby
  wanted to be connected with.
  2018-12-03-03.11.32.289579-300 I92473E622            LEVEL:
  Error
  PID     : 15302                TID : 140287603107584 PROC :
  db2sysc 0
  INSTANCE: hsjiang              NODE : 000            DB   :
  HADRDB
  HOSTNAME: hotellnx113
  EDUID   : 112                  EDUNAME: db2hadrp.0.1 (HADRDB) 0
  FUNCTION: DB2 UDB, High Availability Disaster Recovery,
  hdrVerifyMembersMatch, probe:15595
  MESSAGE : ZRC=0x87800140=-2021654208=HDR_ZRC_CONFIGURATION_ERROR
            "One or both databases of the HADR pair is configured
  incorrectly"
  DATA #1 : <preformatted>
  The local HADR log stream id 0 does not match the remote log
  stream id 2
  
  The following message in the db2diag.log of the new standby
  confirms that the rejection cause the standby database to
  terminate.
  2018-12-03-03.11.32.281133-300 I175790E491           LEVEL: Info
  PID     : 5264                 TID : 140135265986304 PROC :
  db2sysc 0
  INSTANCE: hsjiang              NODE : 000            DB   :
  HADRDB
  HOSTNAME: hotellnx112
  EDUID   : 483                  EDUNAME: db2hadrs.2.0 (HADRDB) 0
  FUNCTION: DB2 UDB, High Availability Disaster Recovery,
  hdrHandleHsAck, probe:43900
  DATA #1 : <preformatted>
  Handshake HDR_MSG_HDRREJECT message is received from
  hotellnx113:32601 (9.26.121.209:32601)
  
  2018-12-03-03.11.32.282571-300 I176812E609           LEVEL:
  Error
  PID     : 5264                 TID : 140135265986304 PROC :
  db2sysc 0
  INSTANCE: hsjiang              NODE : 000            DB   :
  HADRDB
  HOSTNAME: hotellnx112
  EDUID   : 483                  EDUNAME: db2hadrs.2.0 (HADRDB) 0
  FUNCTION: DB2 UDB, High Availability Disaster Recovery,
  hdrHandleHsAck, probe:43901
  MESSAGE : ZRC=0x87800140=-2021654208=HDR_ZRC_CONFIGURATION_ERROR
            "One or both databases of the HADR pair is configured
  incorrectly"
  DATA #1 : <preformatted>
  HADR handshake with hotellnx113:32601 (9.26.121.209:32601)
  failed.
  
  2018-12-03-03.11.32.298613-300 E182259E1365          LEVEL:
  Severe
  PID     : 5264                 TID : 140135333095168 PROC :
  db2sysc 0
  INSTANCE: hsjiang              NODE : 000            DB   :
  HADRDB
  APPHDL  : 0-115                APPID: *N0.DB2.181203081132
  HOSTNAME: hotellnx112
  EDUID   : 489                  EDUNAME: db2agent (HADRDB) 0
  FUNCTION: DB2 UDB, data protection services,
  SQLP_DBCB::setLogState, probe:5000
  DATA #1 : <preformatted>
  Database error has been detected.  As a result, for
  precautionary reasons
  all logging services have been stopped.
  
  2018-12-03-03.11.32.307417-300 I184040E572           LEVEL:
  Severe
  PID     : 5264                 TID : 140135333095168 PROC :
  db2sysc 0
  INSTANCE: hsjiang              NODE : 000            DB   :
  HADRDB
  APPHDL  : 0-115                APPID: *N0.DB2.181203081132
  HOSTNAME: hotellnx112
  EDUID   : 489                  EDUNAME: db2agent (HADRDB) 0
  FUNCTION: DB2 UDB, base sys utilities,
  sqeApplication::AppStopUsing, probe:7876
  MESSAGE : ZRC=0xFFFFFBF6=-1034
            SQL1034C  The database was damaged, so all
  applications processing the database were stopped.
  

Local fix

• Configure different port for the members on the same host.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
  ****************************************************************
  

Problem conclusion

• First fixed in Db2 11.1 Mod 4 Fixpack 5
  

Temporary fix

Comments

APAR Information

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

  IT27157

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

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

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