COMPUTER SYSTEM AND ITS MANAGEMENT METHOD

A migration destination storage apparatus among a plurality of storage apparatuses and has a controller for sending or receiving information to or from a host computer and managing each migration destination volume as an access target of the host computer. The controller manages each migration destination volume by dividing the migration destination volumes into a plurality of resource groups based on identification information for identifying each migration source volume; manages a plurality of resources related to each migration destination volume by associating them with each resource group; and manages each migration destination volume and each resource belonging to each resource group as operation targets to be allocated individually to each migration source user who uses each migration source volume, and as operation targets over which only each migration source user has operation authority.