Patent ID: 8037344

Claim:
A storage system comprising: a storage controller in communication with one or more storage devices; one or more of storage volumes configured from said one or more storage devices, said controller controlling access of input/output (I/O) operations to said one or more volumes; a first physical port having a first identifier; a second physical port having a second identifier; a first virtual port accessed through said first physical port for accessing a first volume of said one or more volumes as a target of the I/O operations; and a second virtual port accessed through said first physical port for accessing a second volume of said one or more volumes, wherein said storage system is configured to maintain a management table which manages associations between said first physical port, said first virtual port, said first volume, between said second physical port, said first virtual port, and said first volume, between said first physical port, said second virtual port, and said second volume and between said second physical port, said second virtual port, and said second volume, respectively.