METHOD OF CHANGING OVER A MULTIPLEX SYSTEM

摘要

When a failure has occurred in a multiplex system, the computer of the operating system in which the failure has occurred stops the processing and starts storing the failure information. Then, a stand-by computer detects the failure in the computer and autonomously takes over the processing. When the failure information is not properly stored, the computer having the failure is completely brought into a halt upon the operation-stop instruction from the stand-by computer. Prior to storing the failure information by the computer which has the failure, the operation of the input/output devices at the coupling portions among the systems such as networks and shared disk devices are halted. Thus the system can be switched at high speeds while storing a large amount of failure information when a failure has occurred in a multiplex system.