Patent ID: 8245077

Claim:
A failover method performed in a computer system having: a first computer which performs an operation, a plurality of standby computers, a second computer which has a management module which manages the first computer and the plurality of standby computers, and a third computer which manages starting and stopping of the standby computers and manages all of the computers included in the computer system; the method including: a first step of acquiring, by the third computer, configuration information of the first computer, the second computer and the plurality of standby computers from the management module of the second computer; a second step of detecting, by the third computer, a failure occurring on the computer system; a third step of determining, by the third computer, whether the detected failure is a failure of the first computer or a failure of the second computer; a fourth step of notifying, by the third computer, the second computer that a failure has occurred in the first computer in a case where the detected failure is the failure of the first computer; a fifth step of taking over, by the second computer which has received the notification of the failure from the third computer, the operation from the first computer to one of the plurality of standby computers; a sixth step of setting up, by the third computer, the management module on the one of the plurality of standby computers based on the acquired configuration information in a case where the detected failure is the failure of the second computer; and a seventh step of inquiring, by the one of the plurality of standby computers set up with the management module, to the third computer whether a reason of failover is the failure of the second computer, in a case of starting the standby computer set up with the management module.