Hitachi, Ltd.

Tomoyuki Kaji

Nobuo Beniyama

Toru Takahashi

Tatsundo Aoshima

Takaki Kuroda

Tetsuya Maruyama

Hiroshi Yoshiura

Yutaka Kurosu

Yuichiro Nagashima

Fuming Liu

Shinobu Eikawa

Tomoto Shimizu

Yoichiro Tsuge

Kenichi Endo

Yukie Kanie

Junichi Mitsuda

Miki Tanaka

Kazumasa Kita

The present invention achieves data relocation in accordance with a user's policies, in an environment where a plurality of storage devices coexist. The volumes belonging to storage devices A-D are managed virtually integrally. A host recognizes a plurality of storage devices A-D as a single virtual storage device. The user is able to group arbitrarily each volume belonging to the storage system, as a plurality of storage layers-. For example, storage layercan be defined as a high-reliability layer, storage layer, as a low-cost layer, and storage layer, as an archive layer. Each storage layer is constituted by a group of volumes corresponding to respective policies (high reliability, low cost, archiving). The user designates volumes Vand Vto be moved, in group units, and indicates a storage layer forming a movement destination, whereby the data is relocated.

Storage system and data relocation control device

Provided are a relocation system and a relocation method capable of relocating a virtual volume that is formed based on thin provisioning while ensuring security against exhaustion of pools. A database stores attribute information for pools and virtual volumes for thin provisioning that exist in a storage device as well as parameters for predicting time period till exhaustion of the pools. When a virtual volume is to be relocated between a plurality of pools, a relocation control section predicts time periods till exhaustion of the pools before and after relocation based on information in the database and determines the relocation is possible or not based on the result of prediction or determines an appropriate relocation plan. This enables control of relocation of virtual volumes.

Relocation system and a relocation method

Provided is an inter-volume migration system that allows selection of a relocation-destination volume in consideration of a volume cost. The inter-volume migration system includes a storage subsystem having one or more volumes, an inter-volume relocation instruction module that relocates a data area from a relocation-source volume to a relocation-destination volume, a cost calculation module that calculates a cost value of a volume, and a volume selection module that selects a candidate for the relocation-destination volume based on the cost value of the volume calculated by the cost calculation module and constraints imposed on the relocation-destination volume.

Inter-volume migration system, inter-volume relocation method, and program therefor

In a storage management system, a host recognizes a plurality of storage apparatuses as one virtual storage apparatus. The user divides each of the volumes that the storage apparatuses have into a plurality of classes in accordance with a policy. When a user specifies moving target data and a class or a policy of a moving destination, the data is reallocated to a class that meets it. The class or policy is held as a data allocation policy. If a sufficient empty space is not present in the moving destination class, by finding out from allocated data, data that also complies with a policy of other class, target data to be expelled and a class of expelling destination are determined for expelling data, so as to ensure a sufficient empty space for reallocation.

Storage management system, storage management server, and method and program for controlling data reallocation

There are included the steps of receiving an operation input for defining a plurality of setting information pieces on a disk subsystem as a command by one operation, storing the defined setting information as a file, and sending the file to the disk subsystem.

Disk array apparatus setting method, program, information processing apparatus and disk array apparatus

There is provided a steganographic system which can dispense with an original image during extraction of watermark by determining a position at which an optimum space dependent physical quantity is embedded as a watermark complying with an image such that the picture quality can be prevented from being deteriorated, embedding watermark information in the image, generating information such as watermark embedding position information and receiving a watermark embedded image and watermark embedded position information to extract watermark information.

Steganographic system, method, program and storage medium therefor

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Kamakura, Japan

Tomoyuki Kaji