MULTIPLEX SYSTEM AND METHOD FOR SWITCHING MULTIPLEX SYSTEM

摘要

The purpose of the present invention is to prevent a standby system from crashing due to the operational data of an operational system. In an operational server (200), a failure detection unit (223) sets a system switching instruction flag to "permitted" when a hardware failure has been detected. A guest OS (220) is subsequently suspended. In a standby server (300), a software FT unit (311) periodically acquires operational data containing the system switching instruction flag from the operational server (200). When a heartbeat signal from the operational server (200) ceases, a system switching detection unit (313) launches a guest OS (320), and sets a system switching status flag to "system switched". A system switching instruction unit (324) detects a hardware failure by referring to the system switching instruction flag, and notifies the system switching detection unit (313) of the system switching instruction. Having received the system switching instruction, the system switching detection unit (313) suspends the guest OS (320) only when the system switching status flag has not been set to "system switched".