Patent ID: 9558149
Date: 2017-01-31
CPC Classifications: G06F

Claim:
1. A dual system configured to provide a predetermined information processing service and equipped with dual computer modules composed of a first computer module and a second computer module, the dual system comprising: a memory copying unit configured to, when an arithmetic device of the first computer module is installed into the dual system, execute a memory copy process of copying data in a memory region of the second computer module into a memory region of the first computer module; a substitute processing unit configured to execute a service substitute process that is executed by a different arithmetic device from an arithmetic device executing the memory copy process and that is at least part of processes involved in the information processing service by the dual system, during the memory copy process; and a shared memory that can be accessed by the second computer module and the substitute processing unit and that stores data of the information processing service by the second computer module and data of the service substitute process by the substitute processing unit, wherein the memory copying unit is configured to execute the memory copy process while excluding the shared memory from a target of the memory copy process, and the dual system further comprises a delayed copying unit configured to, after confirming that the memory copy process ends, copy the data in the shared memory into the first computer module installed in the dual system.