2813990 - DB2 LUW DB6 . . . db2iupdgrade fails with errors, DB21018E Update DBM cfg SYSADM_GROUP errcode = 8 and DBI1281E The database manager configuration file could not be initialized

• db2iupgrade.log.########
  

     ERROR: An error occurred while upgrading the instance "db2<sid>". The return value is "1".
     . . .
     ERROR: DBI1266I  Refer to the log file /db2/db2trp/upgrade.log for more information.
     . . .
     DBI1069E  Unexpected error. Function = backup_instinfo, Return code = 1.
     . . .
     Program name = db2idbm
        Instance home dir = /db2/db2<sid>,   Sysadm group = db<sid>adm
        Instance type = 1,  Auth type = SERVER

        DB21018E  A system error occurred. The command line processor could not continue processing.
        Update DBM cfg SYSADM_GROUP errcode = 8
        DBI1281E  The database manager configuration file could not be initialized.
     . . .
     DBI1124E  Instance db2<sid> could not be upgraded.
     . . .
     DBI1295E  The instance list could not be updated.

     
• db2icrt_local.log.########
     Program name = db2idbm
        Instance home dir = /db2/db2<sid>,   Sysadm group = db<sid>adm
        Instance type = 1,  Auth type = SERVER
           
        DB21018E  A system error occurred. The command line processor could not continue processing.
        Update DBM cfg SYSADM_GROUP errcode = 8
        DBI1281E  The database manager configuration file could not be initialized.
                                   

IBM Db2 LUW on AIX
upgrading from . . . IBM Db2 9.7 FP11
upgrading to     . . . IBM Db2 10.5 FP10SAP2

KBA , BC-DB-DB6-UPG , Upgrade SAP System , Problem