Virtual server migration after performance deterioration

A non-transitory computer-readable storage medium storing a program that causes a processor included in a computer to execute a process, the process comprising:

• referring to a performance deterioration rate of a specific virtual server when utilization of a virtual server other than the specific virtual server in virtual servers that work on a physical server is changed in a stepwise manner, and calculating a first index value relating to a load state of the physical server before the performance deterioration rate of the specific virtual server exceeds a threshold based on a number of virtual CPUs allocated to each of the virtual servers that work on the physical server and utilization of the virtual CPUs;
• calculating a second index value relating to the load state of the physical server based on the number of virtual CPUs allocated to each of the virtual servers that work on the physical server and the utilization of the virtual CPUs while the specific virtual server is activated on the physical server;
• and
• conducting migration to another physical server for a virtual server other than the specific virtual server in the virtual servers that work on the physical server when the calculated second index value exceeds the calculated first index value.

A migration system, comprising:

• an information processing apparatus including a processor;
• a plurality of physical servers coupled to the information processing apparatus;
• and
• a standby server that is coupled to the information processing apparatus and is a dedicated physical server prepared as a migration destination in advance,
• wherein the processor is configured to:
• refer to a performance deterioration rate of a specific virtual server when utilization of a virtual server other than the specific virtual server in virtual servers that work on a physical server is changed in a stepwise manner, and calculate a first index value relating to a load state of the physical server before the performance deterioration rate of the specific virtual server exceeds a threshold based on a number of virtual CPUs allocated to each of the virtual servers that work on the physical server and utilization of the virtual CPUs;
• calculate a second index value relating to the load state of the physical server based on the number of virtual CPUs allocated to each of the virtual servers that work on the physical server and the utilization of the virtual CPUs while the specific virtual server is activated on the physical server;
• and
• conduct migration to the standby server for a virtual server other than the specific virtual server in the virtual servers that work on the physical server when the calculated second index value exceeds the calculated first index value.