Hitachi, Ltd.

Takeyuki Imazu

Nobuhiro Maki

Yuri Hiraiwa

Hiroshi Yamamoto

Kazuhiko Watanabe

Kenichi Oyamada

Yoshiyuki Nishi

Yoshinori Matsui

Taiki Miyaji

Kensuke Amaki

A storage device control method for operating a logical volume to which a control command cannot be issued directly from a host computer is provided. The host computer manages a storage device. The storage device includes a disk device which provides logical volumes and a disk control device which controls the disk device. The host computer issues a control command to a recognized volume in the disk control device. The disk control device operates a recognized volume which is an issue destination of the control command or an unrecognized volume contained in the control command. A logical volume to which the control command is to be issued from the host computer is determined by using definition information (a disk information table, a copy pair information table, or a copy group information table) concerning copy operation retained by storage control software which operates on the host computer.

Storage device control method and computer system

A computer system including a first storage system connected to a first host computer, a second storage system connected to a second host computer and a third storage system connected to the first and second storage systems. The second storage system sets transfer setting before an occurrence of a failure, the transfer setting being provided with a dedicated storage area to be used for transferring data to the third storage system by asynchronous copy in response to a failure at the first host computer. Before the start of data transfer between the second storage system and third storage system to be executed after an occurrence of the failure, the second storage system checks the dedicated storage area, data transfer line and transfer setting information, and if an abnormal state is detected, this abnormal state is reported to the host computer as information attached to the transfer setting.

Computer system and control method for the computer system

In a storage system, one or more storage apparatuses provide a management computer with a first volume for storing data from the management computer, provide a host computer with a second volume for storing data from the host computer, and manage a volume address for the one or more storage apparatuses to manage the first volume and the second volume in the one or more storage apparatuses. The management computer issues a command specifying an arbitrary volume address to the one or more storage apparatuses, and designates, when receiving a normal response from the arbitrary volume address, a volume with the arbitrary volume address as the second volume.

Storage system and copy method

A plurality of second groups respectively including one or more second volumes are configured in correspondence with each of the first groups of a remote copy source in a remote copy destination, journals are acquired from the first storage apparatus periodically and in the order the journals were created for each of the configured second groups, and the acquired journals are reflected in the corresponding second volume in the corresponding second group. In addition, the latest time stamp of each of the second groups containing the journals retained in the second volume in an unreflected state is compared, the time difference of the latest and oldest time stamps is detected, and prescribed control processing is executed for acquiring the journals regarding the second group with the oldest time stamp in preference to the journals regarding other second groups when the time difference exceeds a preset threshold value.

Storage system and remote copy control method

A controller sets a specified time which is a time that specifies a time in the future relative to the current time for all of one or more secondary storage systems. The respective secondary storage systems have a logical volume for backup (BVOL), and set a backup preparation end state when a journal up to a specified time has been established, and report information showing a preparation end state to the controller. The controller issues a backup command to all of the one or more secondary storage systems when information showing a preparation end state is reported from all of the one or more secondary storage systems.

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Yokohama, Japan

Takeyuki Imazu