Solution : https://service.sap.com/sap/support/notes/1285838 (SAP Service marketplace login required)
Key words : 
cd /<base-dir>/jvm  rm -rf /<base-dir>/jvm/   sapcar -xf /<path-, /usr/sap/pi8/ehpi/jvm    total 40    drwxr-xr-, symptom java phase check_available_free_space fails telling, /<base-dir>/abap             /java            /jvm         <-, /<base-dir>/jvmthe 'ls' command, download sap jvm 5, 22 jre    drwxr-xr-, system called pi8, 'jvm' subdirectory, sar             /startup             /versstamp             /<
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