revert to base 2 terabytes to match netapp reports

Change-Id: I5548017f8e9f4899c0d9765cda1b9eef2a95f3b9
use free instead available

Change-Id: I7681f1cfd5225d35931a2253cbfd63bba3134766
update README, fix vault script, reorganise files

Change-Id: Ied4e8561d51b172a6c41d4df5fc418e6b2f01d51