Patent ID: 8214611

Claim:
A storage subsystem, comprising: plurality of memory devices for storing data; and a controller for sending and receiving information to and from a host via a network, and controlling input and output of the data into and from the memory device with the memory device as a backup destination or a restoration destination of the data; wherein the controller measures, at a time of communicating with the host, load information of a plurality of host interface units that send and receive information to and from the host via a network; stores, at a time of backing up the data, the load information that is measured at the time of the backup; and distributes, at a time of restoring the backup data, the load of each of the host interface units based on the load information that is stored at the time of the backup, wherein the controller measures a used bandwidth of each of the host interface units as load information of each of the host interface units; stores, at the time of the backup, the used bandwidth of each of the host interface units that is measured at the time of the backup as the load information; and at the time of the restoration, decides a restoration destination according to an objective of restoration from the memory device, restores the backup data to the decided restoration destination, and distributes the load of a host interface unit corresponding to the decided restoration destination among each of the host interface units based on the stored used bandwidth of each of the host interface units.