Patent ID: 8984248
Filing Date: 2015-03-17
Classification: G06F

Abstract:
1. A data migration system, comprising: a first storage system coupled to a host system; a second storage system coupled to the first storage system and the host system; and a management terminal coupled to the first storage system, second storage system and the host system, wherein the first storage system comprises: a first upper level logical volume; a first lower level logical volume which is thin provisioned and configured from a plurality of virtual areas; a first pool which is a storage area configured from a plurality of first physical areas; and first thin provisioning information representing which first physical area is assigned to which virtual area of the first lower level logical volume, wherein, upon receiving a write request designating the first upper level logical volume, the first storage system assigns the first physical area from the first pool to a virtual area of a write destination in the first lower level logical volume of the first upper level logical volume, writes write target data in the assigned first physical area, and updates the first thin provisioning information, wherein the second storage system comprises: a second upper level logical volume; a second lower level logical volume which is external; a third upper level logical volume which configures a pair with the second upper level logical volume and which is a copy source; a third lower level logical volume which is thin provisioned; and a second pool which is a storage area configured from a plurality of second physical areas, wherein the management terminal is configured to issue a command to the second storage system so that the second storage system maps the first upper level logical volume to the second lower level logical volume, issue a command to the host system so that the host system switches an access path between the first upper level logical volume and the second upper level logical volume, issue a command to the second storage system so that the second storage system executes copy processing of migrating data from the first upper level logical volume to the second upper level logical volume and copying the data from the second upper level logical volume to the third lower level logical volume through the third upper level logical volume.