Datenwiederherstellungsvorrichtung unter Verwendung von Journaldaten und Identifikationsinformation

摘要

A host (1) and a storage system (2) each keep a shared identifier indicating a state of a system. The storage system (2) acquires, at update of data, a data pair including data for a change through processing of the host (1) and data before the update. The storage system (2) relates the data pair to a shared identifier. When the host (1) indicates an identifier, the storage system (2) restores data using the data pair.