VMFS3 Datastore Reformat with VMFS5

Hi. Need some advice please.

I would like to reformat all VMFS3 datastores to VMFS5 without unmapping the LUN on Storage and creating a new LUN.

I know the correct way to remove a datastore from ESXi 5 is to first unmount the datastore and then detaching the device (UUID) from each host. But I would not like todo this, I want to keep all UUIDs the same and not assign new LUNs.

Is there a correct way to-do this, deleting the datastore from a host (which means it’s still mapped, the VMFS is just deleted?) and then adding it again and formatting it with VMFS5, is this the correct way?