Patent ID: 8370588

Claim:
A control method of a computer system, which comprises a host computer that participates in a first fabric, a source storage apparatus that participates in a second fabric, a destination storage apparatus that participates in a third fabric, a management computer that is coupled via a management network to the host computer, the source storage apparatus and the destination storage apparatus, and a switch that controls couplings among the first fabric, the second fabric and the third fabric, the switch being configured so as to separately manage the second fabric and the third fabric, and to couple the first fabric to either the second fabric or the third fabric, the control method of a computer system executing: a setting step of setting a same port name identifier as a port name identifier that has been set in a source port of the source storage apparatus in a destination port of the destination storage apparatus using the management computer; a login step of causing the destination port to log in to the third fabric; a volume migration step of migrating a migration-target logical volume from the source storage apparatus to the destination storage apparatus; and a switchover step of switching the switch, to which a switchover instruction, has been issued, from a first state, in which the first fabric and the second fabric are coupled and the third fabric is decoupled, to a second state, in which the first fabric and the third fabric are coupled and the second fabric is decoupled.