Information processing system, monitoring apparatus, and network device

An information processing system comprising:

• a plurality of information processing apparatuses having ports that input and output data;
• a monitoring apparatus connected to each of the plurality of information processing apparatuses;
• and
• a network device connected to the monitoring apparatus, the network device further connected by a single port, to a port of the each of the plurality of information processing apparatuses, wherein
• the each of the plurality of information processing apparatuses judges based on a result of comparison of a first value indicating an extent of delay of a response to a request at the port of the each of the plurality of information processing apparatuses and a second value obtained from another of the plurality of information processing apparatus and indicating an extent of delay of a response to the request at a port of the other information processing apparatus, whether response to the request is executable by the port of the each of the plurality of information processing apparatuses,
• the monitoring apparatus acquires from the each of the plurality of information processing apparatuses, a result of judgment of whether response to the request is executable by the port of the each of the plurality of information processing apparatuses, and based on the acquired result of judgment by the each of the plurality of information processing apparatuses, determines from the plurality of information processing apparatuses, a first information processing apparatus to which the data is not transmitted and a second information processing apparatus to which the data is transmitted in place of the first information processing apparatus, and
• the network device acquires from the monitoring apparatus, information that identifies the first information processing apparatus and the second information processing apparatus, the network device further changes to the second information processing apparatus, a destination of the data to the first information processing apparatus and changes to the first information processing apparatus, a transmission source of the data from the second information processing apparatus.