Computer system or performance management method of computer system

A management computer for managing a first storage subsystem comprising a first storage area for storing data sent from a computer, and a second storage subsystem to be associated with said first storage area and comprising a second storage area for storing replicated data of data to be stored in said first storage area, comprising:

• a replication processing status referral unit for referring to a replication processing status of data of first storage area and said second storage area to be associated;
• and
• an output unit for outputting first performance information concerning data I/O stored in said first storage area, and outputting second performance information concerning data I/O stored in said second storage area together with said first performance information when said replicated data is being subject to replication processing from said first storage area to said second storage area as a result of referring to said replication processing status.

A performance management method of a computer system a computer, and a storage subsystem comprising at least either a first storage area for storing data sent from said computer or a second storage area to be associated with said first storage area and for storing replicated data of data stored in said first storage area, comprising the steps of:

• referring to a replication processing status of data of first storage area and said second storage area to be associated;
• and
• outputting first performance information concerning data I/O stored in said first storage area, and outputting second performance information concerning data I/O stored in said second storage area together with said first performance information when said replicated data is being subject to replication processing from said first storage area to said second storage area as a result of referring to said replication processing status.