Remote copy system and remote copy management method

A remote copy management method for managing remote copy between a first storage system that provides a main site and a second storage system that provides a sub site, the method comprising:

• performing, by a storage controller of the storage system, the remote copy by storing data and an operation processed in the main site in a journal volume in the first storage system as a main site journal, and by sending the main site journal to the sub site for sequentially performing processing;
• storing, by the storage controller of the storage system, data and an operation processed in the sub site in a journal volume in the second storage system as a sub site journal after a failover from the main site to the sub site is performed, and
• cancelling, by the storage controller of the storage system, an unreflected operation that is not processed in the sub site after being stored in the main site journal prior to the failover in the main site, and sequentially processing the sub site journal in the main site, when a failback from the sub site to the main site is performed.