Storage system and computer system

A computer system having a physical server that configures a plurality of virtual machines, a storage system that provides a virtual volume obtained by replicating a master virtual volume to the physical server, a virus scanning server that executes virus scanning of the virtual volume, and a quarantine server that restores a data of the virtual volume,

• the storage system comprising:
• a first processor coupled to a first memory, the first memory stores instructions that when executed by the first processor configure the first processor to:
• configure a continuous scan generation from the plurality of virtual volumes, the continuous scan generation including a first generation which includes respective difference amounts for each of the plurality of virtual volumes in a zeroth generation, and the plurality of virtual volumes storing duplicated data that is duplicated and stored between the plurality of virtual volumes,
• select one or more of the virtual volumes to be placed into at least two different scan groups based on a data duplication rate of the plurality of virtual volumes included in the continuous scan generation, the data duplication rate indicating the retention rate of the duplicated data between the virtual volumes,
• create replicas for the respective virtual volumes having the greatest difference amounts for each of the at least two different scan groups,
• attach the replicas of the virtual volumes to the virus scanning server,
• wherein the virus scanning server executes virus scanning of the attached replicas, and
• wherein the first memory stores instructions that when executed by the first processor configure the first processor to upon determining at least one of the replicas is infected with a virus, unmount the virtual volumes belonging to the scan group of the at least one replica from the physical server.