Management computer, management method, and computer-readable non-transitory storage medium

A management computer for improving operation of a private cloud computing system, the management computer comprising:

• a communication interface that is communicatively coupled to a plurality of servers that each operate a plurality of virtual machines via a network;
• a memory;
• a display;
• and
• a processor communicatively coupled to the communication interface, the memory and the display, wherein the processor:
• determines, using the communication interface, utilization information for each of the plurality of virtual machines, wherein the utilization information includes a processor utilization, memory utilization and a disk utilization,
• retrieves adequacy ratio definition information from the memory,
• calculates, for each of the plurality of virtual machines, adequacy deviation degrees based on the utilization information and the adequacy ratio definition information,
• calculates, for each respective server from the plurality of servers, a business adequacy ratio based on the adequacy deviation degrees calculated for the plurality of virtual machines operated by the respective server,
• retrieves, from the memory, configuration information for each of the plurality of machines operated by each of the plurality of servers,
• calculates, for each respective server from the plurality of servers, a charge amount based on the configuration information for the plurality of virtual machines operated by the respective server,
• determines, for each of the plurality of servers, a size and location of a respective bubble based on the charge amount and the business adequacy ratio,
• displays, using the display, the respective bubble of each of the plurality of servers on a bubble chart that plots business adequacies ratios along a first axis and charged amounts along a second axis,
• receives a selection of a particular bubble that is displayed for a particular server,
• retrieves, from the memory, amelioration candidate templates for the particular server,
• calculates, for each of the amelioration candidate templates, an expected business adequacy ratio and an expected charge for the particular server,
• determines, for each of the amelioration candidate templates, a size and location of an amelioration bubble based on the expected charge and the expected business adequacy ratio, and
• displays, using the display, the amelioration bubble for each of the amelioration candidate templates on the bubble chart.