Abstract: It is an object of the present invention to realize the transference of a file system without moving data. A transference source file system outputs to a device driver a physical block number included in extent information. A transference driver intercepts an I/O request to the device driver, and obtains a physical block number of the I/O destination. A transference tool obtains a physical block number from the transference driver, and outputs the physical block number to the transference destination file system in order to realize the transference of a file system.

Abstract: A file management program which enables efficient access to data in a directory file by utilizing an extent-based data access structure. When a processing request containing the name information for a file to be processed is inputted, a hash-value generation unit applies a predetermined hash function to the name information, and generates a hash value of the file to be processed. Next, a physical-block-number acquisition unit looks up a hash-value-range table, extracts hash-value-range information, and acquires a physical-block number from the hash-value-range information, where a hash-value range containing the hash value of the file to be processed is included in the hash-value-range information. Then, a directory processing unit acquires from a physical block in a storage device data corresponding to the acquired physical-block number, and performs processing of the data according to the processing request.

Abstract: A volume migration method for causing to carry out a migration from a first volume manager to a second volume, includes: by causing the first volume manager to carry out actual accesses, obtaining information of correspondence, by the first volume manager, between logical volume offsets and physical blocks on a physical medium; judging, based on the obtained information of the correspondence, whether or not an exceptional data layout is carried out; and when it is judged that the exceptional data layout is not carried out, updating only a header area on the physical medium for the second volume manager. Incidentally, the aforementioned obtaining is carried out by using a program module for blocking access by the first volume manager to the physical medium. Thus, when only the header area is updated after it is confirmed the exceptional data layout is not made, the high-speed volume migration becomes possible.

Abstract: A processing method of an information processor for connecting an external device with a main body of the information processor. The processing method also performs processing of an application program with respect to the external device. The processing method includes connecting the external device to the main body. The processing method also includes determining whether the connected external device has been previously connected with the main body of the information processor.

Abstract: A file management program which enables efficient access to data in a directory file by utilizing an extent-based data access structure. When a processing request containing the name information for a file to be processed is inputted, a hash-value generation unit applies a predetermined hash function to the name information, and generates a hash value of the file to be processed. Next, a physical-block-number acquisition unit looks up a hash-value-range table, extracts hash-value-range information, and acquires a physical-block number from the hash-value-range information, where a hash-value range containing the hash value of the file to be processed is included in the hash-value-range information. Then, a directory processing unit acquires from a physical block in a storage device data corresponding to the acquired physical-block number, and performs processing of the data according to the processing request.

Abstract: A plurality of host computers share a hard disk. Each host computer includes a common client that does not depend on the operating system of the host computer. An access control unit is connected to the common client of each host computer via a network and to the hard disk. The access control unit receives a request relating to file access from the host computers.

Abstract: According to the present invention, when an application program on a personal computer executes processing by connecting an external device such as at CD drive, the application program is started and thereafter it is determined whether the external device associated with the application program is fitted with or not. When the external device is not fitted with, the processing is interrupted, and when a fitting of the external device is recognized, the interrupted processing is restarted.

Abstract: An information processing apparatus includes a setting section for setting a sum total of a usable time of at least one specific function under a predetermined condition, and a restricting section for restricting use of the specific function if a used time of the specific function exceeds the sum total of usable time of the specific function.