A first storage system stores information relating to the updating of data stored in that system as a journal. More specifically, the journal is composed of a copy of data that was used for updating and update information such as a write command used during updating. Furthermore, the second storage system...http://www.google.com.tw/patents/US8135671?utm_source=gb-gplus-share專利 US8135671 - Data replication among storage systems
