Patent ID: 7302541
Filing Date: 2007-11-27
Classification: G06F,H04L

Abstract:
1. A storage system in which a first storage device, a second storage device and a host device are mutually connected communicably, comprising: a data migration unit for migrating data stored in a first volume of said first storage device to a second volume of said second storage device; a data migration state management unit for managing a migration state of data from said first volume to said second volume; a first access request processing unit for processing an access request from said host device to said second volume; a first switching indication unit for switching an access destination of said host device to said first storage device based on an access state to a non-migrated area in which data has not yet been migrated from said first volume to said second volume; and wherein said first switching indication unit switches the access destination of said host device to said first storage device when the frequency of access from said host device to said non-migrated area reaches a first prescribed value.