A method and apparatus for managing a migration of a data set from at least one first storage location to at least one second storage location, wherein read requests to the data set from at least one application program executing on a computer system initially are serviced from the at least one first...http://www.google.de/patents/US7093088?utm_source=gb-gplus-sharePatent US7093088 - Method and apparatus for undoing a data migration in a computer system
