Nec Corporation

Tdk Corporation

Naoki Soeda

Yoshihide Kikuchi

Koichi Funaya

Osamu Ootsuka

Kazuyuki Nagumo

Kantarou Oota

Provided is a data storing system which holds only updated data by a snapshot action of a disk array subsystem. When there is generated a writing request to snapshot duplicate volumes as the duplicate data storing areas, unused pages for the requested amount is searched from a common logical-volume which is used in common as a real data storage area within the disk array subsystem, and address conversion of the page is performed. The result of the address conversion is held in a directory which is provided for each of the snapshot duplicate volumes. When making an access to the page thereinafter, the directory is always being referred to, and the address conversion is performed from the page of the snapshot duplicate volumes to the corresponding page of the common logical-volume.

Duplicate data storing system, duplicate data storing method, and duplicate data storing program for storage device

It is to provide a data storage system which causes no delay in the access performance of a master volume in the snapshot action of a disk array subsystem. The data duplication system comprises a temporary data duplication control device and a data duplication control device. The temporary data duplication device functions in such a manner that the master volume and a buffer volume that is built between the master volume and a snapshot volume keep the same volume image. The data duplication control device functions to minimize the I/O load upon the master volume by switching the master volume and the buffer volume as appropriate as the actual data reference target of the snapshot volume.

Data duplication system, data duplication method and program

A disk array subsystem including D disk apparatuses, wherein, there is a redundancy of N (N is an integer equal to or larger than 3), the disk array subsystem includes data regions of each of the disk apparatuses and (N&#x2212;1) copy regions on each of the disk apparatuses, first copies of data to be stored in the data regions of each of the disk apparatuses are to be distributedly arranged in first copy regions of each of the disk apparatuses other than a disk apparatus from which the copies of data are to be distributedly arranged, and second copies of data to be stored in each of the first copy regions of each of the disk apparatuses are to be distributedly arranged, with respect to each of the first copy regions of each of the disk apparatuses, in second copy regions of each of the disk apparatuses other than a disk apparatus from which the second copies of data are to be distributedly arranged, and any of a disk apparatus that any of original data of the second copies are to be stored in the data region.

Disk array subsystem, method for distributed arrangement, and signal-bearing medium embodying a program of a disk array subsystem

A disk system has contents play-back restriction mechanism. A contents storage section, which contents received from a regular server are stored in. A capacitor charged with power supplied from the server. A volatile memory backed up by the capacitor and stores data necessary for the play-back of the contents received from the server. A controller for controlling the contents storage section and the volatile memory for reading and writing data when supplied with power from a regular player or the server.

Disk system and medium with contents play-back restriction mechanism

Disclosed is a magnetic disk apparatus comprising: a disk enclosure; a first printed-circuit board which is paired with the disk enclosure; and a second printed-circuit board which is connected to the first printed circuit board via a cable and is separated from the first printed-circuit board in structure; wherein the first printed-circuit board mounts circuits which are poor in noise resistance property, and a circuit which holds parameters unique to the disk enclosure; and wherein the second printed circuit board mounts circuits which are superior in noise resistance property.

Growing community of inventors

Tokyo, Japan

Naoki Soeda