The setup between the house and the main disconnect is an acceptable (prior to 2008 NEC) installation IF the ground and neutral are bonded at the house (subpanel). There is no need to run a grounding wire back to the disconnect. Ground rods are needed at both locations.
If that is the case, don't run the ground but you must
tie the grounds/neutrals together.
I though the service was the first means of disconect and that the bonding/grounding had to originate there. Y'all do stuff different in the the old country.
Ground rods stay in place for lightning protection.