An information processing system includes plural information processing apparatuses, plural storage devices, a load-balancing control device, and an allocation control device. Each of the plural storage devices is allocated to one of the plural information processing apparatuses. The load-balancing control device is configured to receive an access request, and issue an instruction for performing processing based on the received access request to one of the plural information processing apparatuses. The allocation control device is configured to reallocate, when a failure occurs in a first apparatus of the plural information processing apparatuses, first storage devices to a proper substitute apparatus among the plural information processing apparatuses. The first storage devices have been allocated to the first apparatus. The proper substitute apparatus is different from the first apparatus.