This invention is a system and a method for performing an I/O in a virtual data storage environment using a new architecture. The system of performing an I/O includes a mapping client integrated into a client of the storage server which in communication with the mapping server included in the storage server retrieves the mapping of the special data sharing storage objects and caches the shared objects in the data cache include in the client environment. The method of accessing the data sharing storage objects by one or more applications running on a client reduces the number of I/O on the storage objects by caching the storage objects in the data cache and bringing the knowledge of data sharing into the client environment.