Storage system with remote copy controllers

A storage system control method for controlling a storage system including a first storage apparatus and a second storage apparatus which are communicatively coupled to an external apparatus,

• the first and second storage apparatuses respectively having:
• first and second storage areas selectively accessible from the external apparatus to store data of the external apparatus;
• first and second temporary storage areas temporarily storing input/output data of the first and second storage areas;
• and a remote copy controllers configured to control data copy process between the first and second storage areas and between the first and second temporary storage areas,
• the first and second storage areas being formed by having a logical device allocated thereto in a virtual manner, the logical device being generated from at least one physical storage medium provided in a third storage apparatus communicatively coupled to the first and second storage apparatuses, and
• a data I/O process authority information storage unit storing data I/O process authority information indicating to which one of the first and second storage areas the authority to process data I/O of the external apparatus is provided, the method comprising:
• the remote copy controller in any one of the first and second storage apparatuses reading the data I/O process authority information stored in the data I/O process authority information storage unit;
• and
• the remote copy controller copying, to the other storage apparatus, data stored either in the first storage area and the first temporary storage area, or in the second storage area and the second temporary storage area that are included in the one of the first and second storage apparatuses to which the remote copy controller belongs, when the remote copy controller determines that the data I/O process authority information is not recorded and that the own storage apparatus has a primary logical device in remote copy control.