Patent ID: 7269703
Filing Date: 2007-09-11
Classification: G06F

Abstract:
1. A method of migrating logical volumes of data from an old storage subsystem to a new storage subsystem in a data processing system which includes a plurality of host computers and a plurality of storage subsystems connected to each other by a network, said old storage subsystem including a plurality of logical volumes to be migrated to said new storage subsystem, said logical volumes being divided into a plurality of groups of logical volumes, said method comprising the steps of: conducting an un-transferred phase including pairing said groups of logical volumes in said old storage subsystem to groups of logical volumes in said new storage subsystem and connecting said new storage subsystem to the network; conducting a route-changing phase before migration of the logical volumes from the old storage subsystem to the logical volumes of said new storage subsystem; in said route-changing phase, sequentially changing indications of access destination storage subsystems in said host computers such that the indications of the access destination storage subsystems of said host computers are sequentially changed from said old storage subsystem to said new storage subsystem, thereby permitting each host computer to access both the old and new storage subsystems; conducting a data transferring phase including sequentially transferring on a group basis said groups of logical volumes from said old storage subsystem to said new storage subsystem; and conducting a transferred phase including disconnecting said old storage subsystem from the network and conducting all accesses to said new storage subsystem, wherein information indicating relationships between each of said phases and identifiers of the groups of logical volumes on the old storage subsystem and the new storage subsystem are stored in a table which is stored in a management system connected to the old storage subsystem and the new storage subsystem, and wherein said route changing phase and said data transferring phase are conducted according to groups of logical volumes based on said information indicating relationships in said table.