An Oracle FS System must be connected to the vSphere environment for you to be able to view and manage storage systems.
An Oracle FS System LUN is mapped to that ESX host.
You manually add an Oracle FS System.
Any Oracle FS System that is connected to the vSphere environment is listed in the Oracle FS System tab for hosts. You connect an Oracle FS System to the vSphere environment in the Select Oracle FS System page that appears when you right-click an ESX host in the vSphere inventory tree and select a management task from the Manage Oracle FS Storage context menu.