Patent ID: 8402236
Filing Date: 2013-03-19
Classification: G06F

Abstract:
1. A computer system, comprising: a storage system which is coupled to another storage system; and a management computer which manages the storage system, wherein the storage system comprises: a plurality of physical volumes corresponding to a plurality of logical volumes including a first main logical volume, a plurality of first subsidiary logical volumes and a buffer volume; and a first controller which executes data input/output processing to and from the plurality of physical volumes, the management computer comprises: a memory which stores physical volume information indicating performance of the plurality of physical volumes; and a second controller, the plurality of first subsidiary logical volumes form copy pairs with a plurality of second main logical volumes provided by the other storage system, and the first main logical volume forms a copy pair with a second subsidiary logical volume provided by the other storage system, when an access volume to the first main logical volume exceeds a threshold value, the second controller selects a subsidiary logical volume which is included in the plurality of first subsidiary logical volumes, and which is associated with a second physical volume having higher input/output performance than a first physical volume associated with the first main logical volume, by referring to the physical volume information read out from the memory, and the second controller confirms whether data migration time is within a prescribed time period, and when the migration time is within the prescribed time period, instructs the storage system to migrate data stored in the second physical volume corresponding to the selected subsidiary logical volume to a third physical volume which corresponds to the buffer volume, and to migrate data stored in the first physical volume corresponding to the first main logical volume to the second physical volume corresponding to the selected subsidiary logical volume, and to associate the second physical volume corresponding to the selected subsidiary logical volume with the first main logical volume.