Patent ID: 7487390

Claim:
A failover method used for a system, the system including: a primary site having: multiple nodes that provide a task; and a first storage system allocated to the nodes; and a secondary site having: multiple nodes that can provide a task; and a second storage system allocated to the nodes, the method allowing, if a failure occurs to a node of the primary site, the task to be taken over by a node of the primary site or a node of the secondary site, the method comprising the steps of: setting a priority of a failover for the respective nodes of the primary site; setting a failover destination of the respective nodes of the primary site to one of a node of the secondary site and a node of the primary site based on a correspondence set in advance between a priority and an extent of the failover destination; backing up data from a node of the primary site to a node of a determined failover destination; causing the node of the failover destination and the node of the primary site to mutually detect a failure; and causing the node of the failover destination to take over a task if the node of the failover destination detects a failure of the node of the primary site.