Computer system and a method for controlling a computer system

Abstract

In a cluster system including a plurality of operating systems operating on one computer, computer resources can be updated for and reallocated to each operating system. When the operating systems are used as active or standby operating systems, a multiple operating system management controller monitors the state of each operating system. At a failure of an active operating system, the controller allocates a larger part of computer resources to another operating system in a normal state and assigns the operating system as a new active operating system. Regardless of the failure, the computer system can be operated without changing processing capability thereof. The controller can monitor load of each operating system to allocate computer resources to the operating system according to the load.

1 . A computer system, comprising: 
 means for operating a plurality of operating systems on one computer and allocating computer resources to the operating systems;    means for managing the computer resources;    means for updating allocation of the computer resources to the operating systems and restoring the allocation thereof;    means for managing contents respectively of the update of the computer resource allocation and the restoration of the computer resource allocation in relation to a state of operation of each of the operating systems; and    means for updating the computer resource allocation and restoring the computer resource allocation according to a state of operation of each of the operating systems.    
     
     
         2 - 9 . (canceled)