Abstract: The present invention aims to improve the performance, reliability, and availability in a distributed file system environment. A load observing unit of a distributed file system management server observes load status of each disk, and when the load of a specific disk exceeds a predetermined level, a data controlling unit moves data stored in that disk to another disk, and updates directory information of a directory information database by reflecting this data migration. When a client makes an inquiry for the directory information, a directory notifying unit sends the updated directory information to that client, and a cache of a directory information database of the client side is updated.

Abstract: A remote system fault detecting unit detects a fault in a remote system. A virtual resource management unit selects a virtual resource necessary for structuring a virtual system having the same system configuration as the remote system in which the fault has been detected, based on the remote system configuration information of the remote system. A virtual system structure unit structures a virtual system by using the selected virtual resource. A virtual system start unit starts the virtual system structured by the virtual system structure unit. When the fault in the remote system has been recovered, a virtual system stop unit stops the virtual system and the virtual resource management unit releases the virtual resource.

Abstract: A remote system fault detecting unit detects a fault in a remote system. A virtual resource management unit selects a virtual resource necessary for structuring a virtual system having the same system configuration as the remote system in which the fault has been detected, based on the remote system configuration information of the remote system. A virtual system structure unit structures a virtual system by using the selected virtual resource. A virtual system start unit starts the virtual system structured by the virtual system structure unit. When the fault in the remote system has been recovered, a virtual system stop unit stops the virtual system and the virtual resource management unit releases the virtual resource.