Patent ID: 8667241
Filing Date: 2014-03-04
Classification: G06F

Abstract:
1. A computer system, comprising: a storage system comprising a plurality of storage devices on the basis of a plurality of storage areas; and a controller configured to provide a plurality of virtual logical volumes with a host computer and control data migration, and a management computer configured to manage the storage system and comprising an input device receiving input, wherein the plurality of storage devices are configured to provide a plurality of storage tiers, each storage tier comprising the plurality of storage areas, wherein performance of each of the plurality of storage tiers is different; wherein the controller, when receiving write data to a virtual logical volume among the plurality of virtual logical volumes from the host computer, is configured to allocate a storage area among the plurality of storage areas to the virtual logical volumes and write the write data on the allocated storage area according to necessity, wherein the controller is configured to migrate first data stored in a first storage area in a first storage tier allocated to a first virtual logical volume to a second storage area in a second tier from the first storage area, using migration policy which defines correspondence relationship between access frequency to virtual logical volumes and a storage tier to which data is migrated and allocate the second storage area to the first virtual logical volume on behalf of the first storage area, wherein the management computer is configured to receive configuration of an associated policy for the first storage area which defines a storage tier as a migration destination of data of an associated destination storage area which is associated with the first storage area via the input device, wherein the management computer is configured to send the controller an instruction to migrate second data from a third storage area in a third tier to a fourth storage area in a fourth tier selected by using the associated policy when migrating the first data based on the migration policy, wherein the second data is a copy of the first data and stored in the third storage area, wherein the third storage area is allocated to the second virtual logical volume and associated with the first storage area, and wherein the controller is configured to migrate, in response to the instruction the second data from the third storage area to the fourth storage area and allocate the fourth storage area to the second virtual logical volume on behalf of the third storage area.