Patent ID: 6895483

Claim:
A data relocation method for a computer system including a host computer, a plurality of storage subsystems each having a plurality of storage units, and a data relocation management unit for managing the data relocation between a plurality of said storage subsystems, comprising the steps of: determining whether the data relocation is possible or not from one storage unit to another within one of a plurality of said storage subsystems constituting a relocation source, based on performance information and utilization information of said storage subsystem constituting the relocation source; determining, in the case where the data relocation within said storage subsystem constituting the relocation source is impossible, whether the relocation is possible or not by another one of a plurality of said storage subsystems to a storage unit in said another one of the storage subsystems through said data relocation management unit; and copying data from the storage subsystem constituting said relocation source to said another storage subsystem constituting a relocation destination through said data relocation management unit in the case where the data relocation is possible to said another storage subsystem.