System for dynamically switching logical sessions between terminal device and a processor which stops its operation to another working processor under control of communication control processor

摘要

A control method and apparatus for dynamically switching a logical session in an information processing system having a network control system configuration in which a plurality of terminal devices are connected to a plurality of central processing units via at least one communication control processor. The communication control processor comprises stores histories of command data transactions corresponding to the respective terminal devices, and retrieves the histories of transactions of the terminal devices connected logically to a central processing unit to be replaced when switching from the central processing unit to be replaced to another central processing unit is performed, delivers to the processing unit to be replaced command data to disconnect logical connective relationship from the central processing unit to be replaced, and establishes logical connective relationship to the another central processing unit, and for automatically delivering the retrieved histories of the transactions to the another central processing unit.