Abstract: An epitaxial SiC single crystal substrate including a SiC single crystal wafer whose main surface is a c-plane or a surface that inclines a c-plane with an angle of inclination that is more than 0 degree but less than 10 degrees, and SiC epitaxial film that is formed on the main surface of the SiC single crystal wafer, wherein the dislocation array density of threading edge dislocation arrays that are formed in the SiC epitaxial film is 10 arrays/cm2 or less.

Abstract: A storage system for optimizing volume capacity among file management computers of sharing a storage apparatus is provided. A capacity management computer acquires statistical information such as access history information from the file management computers and the storage apparatus. The capacity management computer executes a capacity optimizing process for the storage apparatus in association with a specified date. The capacity management computer calculates optimized capacity for the respective file systems based on the statistical information by redistributing available capacity of volumes according to a predetermined standard such as a capacity consuming speed. Further, the capacity management computer instructs the file management computers and the storage apparatus to optimize a size of the file systems and the capacity of the volumes, respectively.

Abstract: A proposal is made of a file management system and method capable of reliably deleting unnecessary data. In a file management console and method for reading or writing data of a file from or in a first volume, which is provided by a storage device, in response to a request sent from a host computer, one snapshot or multiple snapshots that relate to the first volume and can be updated are created. In response to an externally issued designated file deletion command, a designated file is deleted from all of the first volume and snapshots or part thereof specified in the deletion command. At this time, the data items of the designated file in the first volume and/or snapshots from which the designated file should be deleted are overwritten with invalid data. Moreover, pieces of management information on the designated file are changed to a reference-disabled state.

Abstract: In a storage system that includes two or more file servers each including an arbitrary number of operating virtual file servers, a management server: holds a load information table regarding a load on each virtual file server for each time period and redundancy information table for the storage system; judges, with reference to the load information table and redundancy information table, whether or not the loads on the virtual file servers can be handled by a smaller number of file servers than the number of currently-operating file servers; selects, if the judgment result is positive, a power-off target file server and makes another file server fail over a virtual file server in the power-off target file server; and turns off the power-off target file server.

Abstract: Proposed are a backup apparatus and a backup method capable of improving the backup performance, as well as a file reading apparatus capable of improving the file reading performance. As a result of determining a read sequence upon reading the respective files from a disk device based on a physical address of the respective storage areas storing data of each of the files in the disk device, and sequentially reading data of each of the files from the disk device according to the determined read sequence, overhead such as the head seek and rotational delay in the disk device upon reading a plurality of files from such disk device can be dramatically reduced.

Abstract: Provided is a computer system containing plural storage systems which manages the bandwidth of the storage systems in accordance with storage area attributes. The computer system is characterized in that: a control unit incorporates related file information in metadata, the related file information containing information for identifying a second file which to be write-accessed in conjunction with access to a first file by a client computer, and an access type of the write access. The control unit refers to the related file information to obtain the second file and the access type when the first file is accessed by the client computer. The control unit reads, from the obtained second file stored in the disk device, data corresponding to the obtained access type, to store the read data in a cache memory.

Abstract: A double hetero structure light-emitting diode device includes an active layer (6), a positive-electrode-side cladding layer, a negative-electrode-side cladding layer (4), a window layer (9) and an undoped AlInP layer. The positive-electrode-side cladding layer includes an undoped AlInP layer (7) grown to have a thickness of 0.5 ?m and an intermediate layer (8) doped to assume p-type conductivity and having an intermediate energy band gap value between that of the undoped AlInP layer and that of the window layer. The window layer on the intermediate layer is a GaP layer grown at 730° C. or higher and at a growth rate of 7.8 ?m/hour or more in the presence of Ze serving as a dopant. The negative-electrode-side cladding layer is provided with an undoped AlInP layer (5) having a thickness of 0.1 ?m or more.

Abstract: A computer system including a storage system, a host computer system, a path configuration unit that associates a local path with a global path, an access path conversion unit that converts a global path into a local path associated, by the path configuration unit, with the global path used in the file access, and forwards the converted file access to the storage system, an access log reception unit that receives an access log from the storage system, an access log conversion unit that converts the local path used in the access log received by the access log reception unit, into a global path associated, by the path configuration unit, with the local path used in the received access log, and an access log display unit that displays the converted access log.

Abstract: Provided is a computer system containing plural storage systems which manages the bandwidth of the storage systems in accordance with storage area attributes. The computer system is characterized in that: a control unit incorporates related file information in metadata, the related file information containing information for identifying a second file which to be write-accessed in conjunction with access to a first file by a client computer, and an access type of the write access. The control unit refers to the related file information to obtain the second file and the access type when the first file is accessed by the client computer. The control unit reads, from the obtained second file stored in the disk device, data corresponding to the obtained access type, to store the read data in a cache memory.

Abstract: A double hetero structure light-emitting diode device includes an active layer (6), a positive-electrode-side cladding layer, a negative-electrode-side cladding layer (4), a window layer (9) and an undoped AlInP layer. The positive-electrode-side cladding layer includes an undoped AlInP layer (7) grown to have a thickness of 0.5 ?m and an intermediate layer (8) doped to assume p-type conductivity and having an intermediate energy band gap value between that of the undoped AlInP layer and that of the window layer. The window layer on the intermediate layer is a GaP layer grown at 730° C. or higher and at a growth rate of 7.8 ?m/hour or more in the presence of Ze serving as a dopant. The negative-electrode-side cladding layer is provided with an undoped AlInP layer (5) having a thickness of 0.1 ?m or more.