1. An information processing system, in which a computer having a first storage device and a storage controller having a second storage device are connected via a network, wherein the computer manages an update status of the first storage device, and when able to communicate with the storage controller, and transfers the data written to the first storage device to the storage controller, independently of data writing to the first storage device, the storage controller writes the transferred data to the second storage device, the computer, upon detecting a failure of the first storage device, notifies the storage controller of the failure, and the storage controller, which receives the failure information notification, selects a third storage device that is capable of being used by the computer, and copies the data, which have been written to the second storage device, to the selected the third storage device.