Solution : https://service.sap.com/sap/support/notes/1399963 (SAP Service marketplace login required)
Key words : 
'/usr/sap/<sid>/mds<inst>/work', note concerns problems, consistency check log, mdm server instance, sap release 7, work directory, server instance, log situations, mdm server 7, mdm server
Related Notes : 
       
| 1399671 | IBM i: Implementing ILE component corrections | 
| 1390533 | IBM i: Recommendations for using MDM syst in operating syst |