Patent ID: 8364869

Claim:
A system comprising: a host computer; and a storage system including: a first and second physical port to receive I/O operations from the host computer; a first plurality of logical volumes coupled to the first physical port; a second plurality of logical volumes coupled to the second physical port; and a storage controller including a memory and a processor, wherein the host computer is able to access both the first and second physical port via a first virtual port, wherein in response to a write command to be written to a first logical volume in the first plurality of logical volumes from the host computer, the storage controller controls data to be transferred to the first logical volume via the first physical port which is identified based on a first virtual port identifier and a first volume number, and wherein in response to a write command to be written to a second logical volume in the second plurality of logical volumes from the host computer, the storage controller controls data to be transferred to the second logical volume via the second physical port which is identified based on a first virtual port identifier and a second volume number, wherein in response to a virtual port delete command identifying the first logical volume, the storage controller: acquires information of the first virtual port identifier and the first physical port identifier associated with the first logical volume, and deletes Information indicating a relationship between the first virtual port identifier and the first physical port identifier based on the information acquired by the storage controller.