SERVER SWITCHING METHOD IN CLUSTER SYSTEM

PROBLEM TO BE SOLVED: To provide a server switching method in a cluster system for avoiding such a state that a plurality of MAC addresses are made correspond to IP addresses to be provided by a cluster system, and for preventing communication failure in a network even when a server in a stand-by mode makes erroneous judgement, and a switching operation is performed due to inter-server heart beat transmission path abnormality or the like. SOLUTION: When heart beat disruption from a server 1101 in an execution mode is detected in a server 1201 in a stand-by mode configuring a cluster system, an ARP packet in which an MAC address which does not exist on a network is made to correspond to the IP address of a client is transmitted from the server 1201 in the stand-by mode to the server 1101 in the execution mode and the server 1101 is put in a communication-unabled state, and one server can be put into a state where it is isolated from the network. COPYRIGHT: (C)2009,JPO&INPIT