A heterogeneous computer system, a heterogeneous input/output system and a data back-up method for the systems. An I/O subsystem A for an open system and an I/O subsystem B for a mainframe are connected by a communication unit. In order to back up data from at least a disk connected to the I/O subsystem...http://www.google.de/patents/US6892268?utm_source=gb-gplus-sharePatent US6892268 - Heterogeneous computer system, heterogeneous input/output system and data back-up method for the systems
