Computer system or performance management method of computer system

A computer system, comprising:

• a computer that includes a memory, an output module, and an input module;
• a first storage subsystem that is connected to the computer, includes a first logical volume for storing data, and transfers replicated data of data stored in the first logical volume;
• and
• a second storage subsystem that is connected to the computer and to the first storage subsystem, includes a second logical volume associated with the first logical volume as a copy pair mate and storing replicated data, and receives the replicated data from the first storage subsystem,
• wherein, the computer:
• acquires copy pair status information concerning the status of copy pair of the first logical volume and the second logical volume, and storing it in the memory;
• when receiving an operational status presentation request, refers to the memory and acquires, based on information indicating the copy pair status, a performance correlation between a plurality of resources from a management table stored in the memory;
• and
• displays information on the performance correlation between the resources on the output module based on the acquired information.