In an information processing system, a first system control apparatus of a first information processing apparatus causes a first connecting apparatus to disconnect from the first shared storage apparatus, causes a second connecting apparatus to disconnect from the second shared storage apparatus, causes a control part to start up the first information processing apparatus, causes another first connecting apparatus used to replace the first connecting apparatus to connect to the first shared storage apparatus, and causes the second connecting apparatus to connect to the second shared storage apparatus. In the information processing system, a second information processing apparatus includes a second system control apparatus and a third and fourth connecting apparatuses used to connect to the first and second shared storage apparatuses, respectively.