Hitachi, Ltd.

Hironobu Inoue

Hiroyuki Morimoto

Shintaro Inoue

Yutaka Takata

Hidenori Suzuki

Katsuhiro Okumoto

According to the present invention, a process that requires for creating a backup at a designated time point is executed by sharing among a plurality of storage control apparatuses. An intermediate storage apparatusreads journal data and a JNCB from a primary storage apparatus, and stores the journal data and the JNCB in an intermediate journal volume. A secondary storage apparatusreads the journal data and the JNCB from the intermediate storage apparatus, and stores the journal data and the JNCB in a secondary journal volume. After the secondary storage apparatushaving a designated generation restores the journal data up to a designated time point into a secondary data volume, the secondary storage apparatussplits a copy pair. Another secondary storage apparatusexecutes a regular restoring process.

Storage system and method of creating backup of storage system

This invention intends to provide the computer system equalizing the storage capacity immediately and appropriately to multiple real logical areas dynamically providing storage capacity to virtual logical areas. This invention is the computer system which, in the process of performing the dynamic allocation of storage areas to virtual volumes in response to accesses from the higher-level device, when adding pool volumes to the pool, migrates storage areas among multiple logical areas, and maintains the balance of the storage capacity.

Computer system and its control method

To provide a remote copy system and the control method for the same capable of performing the setting of volume pairs in the consistency group and changing the setting by the simple operation without depending on the pair definition processing. A copy pair configured of a primary volume and a secondary volume is suspended, and the suspended primary volume and the secondary volume are set to another consistency group different from the original consistency group, and then the primary volume and the secondary volume are resynchronized.

Remote copy system and remote copy control method in which a copy pair is changed from a first consistency group to a second consistency group (STG)

Upon starting the initial copy process, a pair creation command is issued from a primary disk subsystem to a secondary disk subsystem. The secondary disk subsystem sets a target area of a second disk drive to an unwritten status, and thereafter writes update data that was updated in a primary site into a designated area of the second disk drive. Subsequently, when data of a first disk drive is backed up to an external medium, the external memory medium is transported to a secondary site, and then connected to a host computer. Unwritten data among the backup data recorded in the external memory medium is thereafter restored to the first disk drive, and the initial copy is completed on the condition that all data in the first disk drive has been copied to the second disk drive.

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Odawara, Japan

Hironobu Inoue