Patent ID: 8683482

Claim:
A control method for a computer system comprising one or more host computers, one or more storage systems, and a management computer, the host computer and the storage system being connected to the management computer through a first network, the host computer and the storage system being connected to each other through a second network, the management computer comprising: a first interface connected to the first network; a first processor connected to the first interface; and a first memory connected to the first processor, the host computer comprising: a second interface connected to the first network; a third interface connected to the second network; a second processor connected to the second interface and the third interface; and a second memory connected to the second processor, the storage system comprising: a fourth interface connected to the first network; a third processor connected to the fourth interface; a third memory connected to the third processor; one or more fifth interfaces connected to the second network; a plurality of controllers connected to the one or more fifth interfaces; and one or more logical volumes for storing data used by the host computer, each of the controllers comprising: a fourth processor connected to the fifth interface; and a fourth memory connected to the fourth processor, the controllers including at least one first controller to which one of the logical volumes is assigned and at least one second controller to which the one of the logical volume is not assigned, wherein paths connecting the host computer and the logical volumes pass through the controllers, the method comprising: monitoring a load of the first controller to determine whether or not performance information of the first controller exceeds a predetermined threshold by the first processor; and assigning the logical volume assigned to the first controller to the second controller by the first processor by switching one of the paths connecting the host computer to the assigned logical volume when the performance information of the first controller exceeds the predetermined threshold.