Computer system, storage apparatus and storage management method

A computer system having a computer and a storage apparatus connected to said computer in which said storage apparatus holds one or more memory areas, and a volume which holds data used by the computer is stored in said memory area, wherein

• said computer comprises a storage management portion and an application execution portion which uses a replication volume;
• said application execution portion commands said storage management portion to create said replication volume of a specified volume which executes an application;
• said storage management portion commands said storage apparatus to create one or more replication volumes of said volume based on the command from said application execution portion;
• said storage apparatus comprises a replication volume creation portion which creates the replication volume of said volume so as to have it memorized in said memory area in accordance with the command from said storage management portion;
• said storage management portion notifies said application execution portion of at least the created number of replication volumes and characteristics thereof as information relating to said replication volume;
• and
• said application execution portion rearranges and performs that application execution process in accordance with the created number and characteristics of the replication volumes which are created.