Solution : https://service.sap.com/sap/support/notes/809306 (SAP Service marketplace login required)
Key words : 
script startdb shows  unix> startdb  /usr/sap/<sapsid>/sys/exe/run/startdb, sap exe directory  /usr/sap/<sapsid>/sys/exe/runplease change, hadr database role                                      = standard  hadr local host, terms db2udb db6 userexit logarchmeth1 reason, script startdb checks parameter userexit, sap startup script fails, db2 log file management introduced, = 1  percent log file reclaimed, <sapsid>adm> db2, startdb script
Related Notes : 
       
| 780546 | DB6: Use of new functions in DB2 V8.2 |