1. A data storage device comprising: a hypervolume accessible by two or more servers operating on two or more data storage systems; a first physical volume located at a first data storage system and associated with the hypervolume; and a second physical volume located at a second storage system and associated with the hypervolume; wherein the hypervolume directs input/output (I/O) from the servers to a primary physical volume comprising one of the first and second physical volumes, and further wherein the primary physical volume may be changed, transparently to the servers, to the other of the first and second physical volume.