Hitachi, Ltd.

Hitachi-lg Data Storage, Inc.

Tooru Kawashima

Norihiro Hara

Katsushi Yako

Masami Hikawa

Masuo Oku

Yoshimichi Kudo

Yoshio Miura

Atsushi Yamada

Tooru Fujishima

Chiharu Takayama

Mitsuhiro Nishidate

Tsuyoshi Toda

Koichiro Nishimura

Tetsuya Suzuki

Kiyomi Hirohata

Tomoya Hoshi

Masataka Kan

Yoshihide Sato

Hideyuki Kanuka

Keisuke Matsubara

Yasuhisa Koide

Toshio Satou

Takatoshi Ohara

Minoru Tomisaka

Misaki Mito

According to the invention, it is possible to efficiently construct an environment for implementing an IT system. Provided is an environment construction support device. The environment construction support device stores a tree structure model that is information representing an environment for implementing an IT system in a tree structure and can be updated as needed, a construction script structure that is information related to a construction script that is a series of codes for constructing the environment and can be updated as needed, and parameter correspondence information that is information indicating a correspondence between an element of the tree structure model and an element of the construction script, and updates the parameter correspondence information to correspond to latest contents of the tree structure model and the construction script structure by comparing at least one of the tree structure model and the construction script structure with the parameter correspondence information.

Environment construction support device and environment construction support method

A server to be changed is added to a destination unit in terms of configuration. The server to be changed is started to restore the database in the database storage region to which the server has access and to restore the transaction for the process that was executed when the server failed. The destination of the failed server (a system destination unit) when failure occurs is determined to stabilize the throughput of the entire system after the switchover of the system in the event of failure. The destination server is determined according to an instruction given in advance by the user. The database management system statistically determines the destination server in accordance with a policy designated by the user. Alternatively, the database management system dynamically determines the destination server according to the policy designated by the user when failure occurs.

Method and system for data processing with high availability

It is to provide an optical disc recording apparatus and a recording power control method that are adapted to high-speed recording and can set an optimal erasing power with high accuracy. A test writing signal detector reproduces a test writing signal of a predetermined mark length or space length with varied power, and detects the number of error mark signals and an amplitude value of an envelope. A controller obtains a first threshold Peof the erasing power based on the number of error mark signals in a region where laser power is low, and obtains a second threshold Peof the erasing power based on the amplitude value in a region where the laser power is high. Then, the controller sets an optimal value of the erasing power from an average value of the first and second thresholds.

Optical disc recording apparatus and recording power control method

The present invention makes it possible to reproduce reproduction images without a break without having to use any additional identification information even when real-time recorded data is not completely continuous. A control circuit references a data identification flag ('Recording Type') which is attached to each sector of reproduction data to indicate the type of recorded data, and counts the number of sectors to which the data identification flag representing real-time recorded data is attached. When the count is not smaller than a threshold value, the control circuit reproduces all the sectors of the target reproduction block in a real-time reproduction mode. In the real-time reproduction mode, the control circuit masks a portion of reproduction data that is found to be defective, changes the value of the defective data to 0 (zero), and transfers the resulting reproduction data to a host device.

Optical disc apparatus and reproduction control method

In a database management system using a shared-nothing architecture and adopting a system takeover in a DB storage area unit, correspondence information is provided which indicates a relation between a DB storage area and a DB processing server in charge of an access to the DB storage area, when a takeover occurs to some DB storage area, the correspondence information is changed in such a manner that an access process to the DB storage area is made in charge of another running DB processing server, and when some DB storage area is accessed in response to an inquiry request from a user, a DB processing server as an access request destination is determined by referring to the correspondence information.

Method for process substitution on a database management system

An attempt is made to prevent an adequate recording power detection lag from being generated according to data from a defective area at trial writing, by detecting a defective area portion based on a fluctuation of return light when a trial write recording mark is formed, recording it in another portion under the same conditions as the detected portion, and using the information on the recorded area instead of the area in which the defective area was detected at reproduction of the trial writing.

Optical information recording reproducing apparatus and recording method

A control apparatus for controlling an optical video disk player capable of optical recording and reproduction of video and/or audio information on a recording medium by a light beam. The control apparatus comprises a tracking failure detection circuit detecting failure of the light beam to accurately track along a track formed on the recording medium, and a light beam control signal generator circuit reducing the energy of the light beam in response to the detection of the tracking failure by the tracking failure detection circuit, whereby recording of information on the recording medium is inhibited in the event of occurrence of a tracking error.

Control apparatus for optical video disk recorder/player

An optical disc player for optically recording the video information or audio information onto a recording medium or optically reproducing the recorded information. The disc player includes a search unit for searching an information track having no signals recorded thereon prior to additionally recording an information signal on the unrecorded track. The search unit has a level detection circuit for detecting the energy value of the light reflected by the recording medium or an RF signal detection circuit for detecting the RF signal component. When the reflected light energy exceeds a predetermined value or the RF signal component is not detected, the search unit regards the track as a track having no signals recorded thereon, the search operation for a track having no signals being terminated and information can be recorded of the track having no signals recorded thereon.

Control apparatus for optical disc player for locating blank tracks

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Mito, Japan

Tooru Kawashima