Patent ID: 7343465

Claim:
A computer system comprising: a storage system that provides a host computer with a storage area that stores data, wherein the storage system comprises: a first data storage unit having a temporary storage area which is prepared in advance for the purpose of being provided to the host computer; a storage area setup unit that associates the temporary storage area with access point information for specifying an access point for the host computer in response to a given storage area allocation request, prior to completion of a process of creating a normal storage area within a second data storage unit in response to the allocation request, the access point information to be used by the host computer to access the normal storage area; a data relay unit that relays an access by an access request including the access point information from the host computer to the temporary storage area associated with the access point information, prior to completion of the normal storage area creation process; and a data migration unit that migrates data in the temporary storage area to the normal storage area after completion of the normal storage area creation process, wherein the storage area setup unit, after completion of the migration, switches an association of the access point information from the temporary storage area to the normal storage area, such that the normal storage area is associated with the access point information, and wherein the data relay unit, after completion of the migration, relays an access by an access request including the access point information from the host computer to the normal storage area associated with the access point information.