Solution : https://service.sap.com/sap/support/notes/1289413 (SAP Service marketplace login required)
Key words : 
relevant fixpak notes explain, hadr standby node, standby hadr node, hadr primary node, primary hadr node, db2 fixpak level, script db6_update_db reason, script db6_update_db supports, db2 fixpak, hadr database
Related Notes : 
       
| 1138550 | DB6: Installing Fix Packs for DB2 V9.5 (Windows) | 
| 1138549 | DB6: Installation of Fix Packs for DB2 V9.5 (UNIX & Linux) | 
| 978555 | DB6: Installing FixPaks for DB2 V9.1 on Windows | 
| 978554 | DB6: Installing FixPaks for DB2 V9.1 (UNIX+Linux) | 
| 603981 | DB6: Installing V8.2 FixPaks (as of FP9) on Win NT/Win 2000 | 
| 603972 | DB6: Installing V8.2 FixPaks (as of FixPak 9) on UNIX |