Solution : https://service.sap.com/sap/support/notes/928835 (SAP Service marketplace login required)
Key words : 
prerequisites - solution apply basis support package 7, symptom db02 refresh fails, /os space information reason, attached correction instructions
Related Notes : 
       
| 427748 | DB2-z/OS: CCMS corrections (6.10, 6.20, 6.40, 7.x) |