Patent ID: 8285933
Filing Date: 2012-10-09
Classification: G06F,H04L

Abstract:
1. A storage system comprising: multiple storage control units including a first storage control unit and a second storage control unit in communication with each other via a network, each storage control unit including at least one physical port for communication with a first Fibre Channel (FC) switch; a first virtual port created for a first physical port in the first storage control unit; and a first virtual volume created on the first storage control unit, the first virtual volume mapping to a logical volume on an external storage system, wherein if a first frontend virtual port and the first virtual volume in the first storage control unit are transferred to the other control unit, whether a second physical port of the second storage control unit on a path to the same logical volume exists or not is determined, and when the second physical port of the second storage control unit on the path to the same logical volume exists, the first frontend virtual port is transferred to the determined second physical port of the second storage control unit; and wherein, if the first frontend virtual port in the first storage control unit is transferred, a backend virtual port corresponding to the first frontend virtual port is determined, and the backend virtual port is transferred to the determined second physical port of the second storage control unit together with the first frontend virtual port.