Information about remote copy target volumes of other storage systems 2 each having one and the same original volume V1 is registered for each remote copy target volume in advance. When there occurs a failure in a copy source storage system 2, a copy source volume for remote copy target volumes using...http://www.google.de/patents/US7685387?utm_source=gb-gplus-sharePatent US7685387 - Storage system for multi-site remote copy
