Patent ID: 8364925

Claim:
A computer system comprising: a storage system including a plurality of storage apparatuses, each of the plurality of storage apparatuses providing volumes; a host computer accessing the storage system via a network; a plurality of resource groups, each of the resource groups simultaneously migrating a respective group of the volumes; and a management computer monitoring the plurality of storage apparatuses, managing a resource group associated with migration source volumes, storing migration management information which includes migration statuses of the migration source volumes to migration destination volumes, and storing a migration plan corresponding to the resource group associated with a migration source volumes, the migration plan including a mid-process control plan for a certain status of the storage apparatuses, wherein, during migration of the migration source volumes to the migration destination volumes, the management computer: detects the certain status of the storage apparatuses according to the monitoring of the plurality of the storage apparatuses; and executes the mid-process control for the migration of the migration source volumes to the migration destination volumes according to the certain status, wherein a plurality of mid-process control plans set for each of the resource groups, wherein the management computer determines beforehand whether or not conflicting mid-process control plans have been set for each of the resource groups, and wherein the mid-process control plans are determined to be conflicting when conflicting settings have been set for the same resource group.