Operation management system of the diskless computer

The system management server (10) makes a request to the virus detection and removal server (30) for virus detection processing on a specified primary volume of the storage system (20). The virus detection and removal server (30) executes virus detection processing on the requested primary volume and the secondary volume that forms the volume pair at the storage system (20). Even during virus detection processing on the storage system (20), it is possible for the centric PCs (40) and (42) to continue write and read processing on the requested primary volume.