Patent ID: 8745425

Claim:
A computer system comprising a blade system and a management server, the blade system comprising: a plurality of server blades configured to process a request from a client; a power controlling unit configured to provide an instruction for activation and stopping of each of the plurality of server blades; a priority maintaining unit configured to maintain a priority of each of the plurality of server blades; and a load balancing blade configured to assign a processing of the request from the client preferentially with respect to an operating one of the server blades having a high priority rather than an operating one of the server blades having a low priority, and the management server comprising: a monitoring unit configured to acquire a number of times of activation/stop and a processing amount of each of the plurality of server blades from the blade system; a judgment table for storing the number of times of activation/stop and the processing amount of each of the plurality of server blades; and a judging unit configured to maintain a power activation threshold, set a first one of the server blades, which is operating and which has a smallest number of times of activation/stop among a plurality of operating server blades, to have a lowest priority among the plurality of operating server blades, set a second one of the server blades, which is stopping and which has a smallest number of times of activation/stop among a plurality of stopping server blades, to have a highest priority among the plurality of stopping server blades, and control the power controlling unit so as to activate the second server blade having the highest priority among the plurality of stopping server blades when a first processing amount of the first server blade is larger than the power activation threshold.