Patent ID: 8667118

Claim:
A management server apparatus communicably connected to physical servers on which a virtual server operates, comprising: a virtual server initiating module that delivers a virtual server image including an operating system and a performance measurement program and issues a request to a plurality of physical servers that are targets of performance measurement to activate a performance measurement virtual server for performance measurement based on said distributed virtual server image including an operating system and a performance measurement program; a performance information receiving module that receives from each physical server performance information measured by the performance measurement virtual server; and a storage medium that stores performance information of each of the physical servers; a physical server selecting module that selects, as a target of performance measurement, at least one physical server including a resource required for an allocation objective virtual server; a virtual server image storage module that stores virtual server images between which at least either one of an operating system and a performance measurement program differs; and an image selecting module that selects, from the virtual server images stored in the virtual server image storage module, a virtual server image suitable for changing performance measurement; said virtual server initiating module that delivers said virtual server image to said at least one physical server selected by said physical server selecting module and issues a request to said at least one physical server to activate a performance measurement virtual server for performance measurement based on said distributed virtual server image.