A shared-nothing MP has some of the following characteristics:Each processor is a stand-alone machine.
Processors share nothing;each one has its own caches,memory and disks.Also,each processor runs a copy of the operating system.Processors can be interconnected by a LAN if they are loosely coupled or interconnected by a switch if they are tightly coupled.Communication between processors is done via a message-passing library.
Example of a shared-nothing MP are in the IBM RS/ 6000 SP range,as well as Tandem,Teradata and most of the massively parallel machines,including Thinking Machines,Intel Touchstone,Ncube and so on.