Solution : https://service.sap.com/sap/support/notes/214369 (SAP Service marketplace login required)
Key words : 
access directory /usr/sap/<sid>/sys/global, directory     /usr/sap/<sid>/sys/globaland, directory   /sapmnt/<sid>/globalshould, extend sap job logs, sap job logs, high-availability tool, high-availability tools, system displays  error 3029, work directory, job terminations
Related Notes : 
       
| 825473 | IBM i: Online backup as of V5R3M0 | 
| 202593 | iSeries: online backup with SAVR3SYS | 
| 185569 | AS/400 errno-codes and their meaning, CPExxxx |