Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Takeshi Ido

Youichi Gotoh

Shizuo Yokohata

Shigeo Honma

Toshiyuki Yoshino

Kiichiro Urabe

Mitsuru Kashiwagi

Katsuhiro Uchiumi

Embodiments of the present invention are directed to methods and systems of storing data in storage volumes while ensuring data matching between the storage volumes. In one embodiment, a system for storing data comprises a first storage area to store data, a second storage area to store data, a first storage control unit configured to control the first storage area, and a second storage control unit configured to control the second storage area. In response to a first write request issued to write data in the first storage area, the first storage control unit is configured to write data associated with the first write request to the first storage area and to transfer the first write request to the second storage control unit, and the second storage control unit is configured to write the data associated with the first write request to the second storage area. In response to a second write request issued to write data in the second storage area, the second storage control unit is configured to transfer the second write request to the first storage control unit.

Storage system with data redundancy between storage volumes

The present invention allows a reserved state that prevails for an LDEV as a result of a host undergoing a system shutdown or the like to be confirmed and cancelled easily. The serverreserves the LDEVand uses same exclusively. When the serverundergoes a system shutdown due to a fault or similar (S), the LDEVthen remains reserved (S). The serveris therefore unable to access the LDEV. The system administrator reads exclusive control informationin the memoryvia the management terminal, and is thus able to display the reserved states of respective LDEVs on a terminal screen and confirm these states. The user then issues an instruction to cancel a reserved state from the management terminal(S). The disk array devicereceives the cancellation instruction, and then cancels the reserved state by partially rewriting the exclusive control information

Disk array device and reservation cancellation control method for disk array device

In response to requests for I/O processing sent from a computer, I/O which should be processed at a priority is enabled to be processed without being affected by other processing, by classifying I/O into those to be processed at a priority and those not to be processed at a priority. The storage control apparatus comprises an I/O processing controller with a memory that is common for the whole controller. The storage control apparatus manages information for dividing and controlling a plurality of I/O processes as priority and non-priority in that memory and operates while suppressing non-priority I/O processing on the basis of information in the memory.

Storage control apparatus

A storage controller can perform backup processing without proceeding via a server and without the need for the server to grasp the state of pair volumes. When an instruction for backup is given from the server while data is being copied from a source volume to a target volume, the storage controller transfers the data to a backup device using differential information between the pair volumes after waiting until data about a range to be backed up and instructed by the server is copied into the target volume.

Storage system, backup system, and backup method

Embodiments of the present invention are directed to methods and systems of storing data in storage volumes while ensuring matching data redundancy between the storage volumes. In one embodiment, a system for storing data comprises a first storage area to store data; a second storage area to store data; a first storage control unit configured to control the first storage area; and a second storage control unit configured to control the second storage area. In response to a first write request issued to write data in the first storage area, the first storage control unit is configured to write data associated with the first write request to the first storage area and to transfer the first write request to the second storage control unit, and the second storage control unit is configured to write the data associated with the first write request to the second storage area. In response to a second write request issued to write data in the second storage area, the second storage control unit is configured to transfer the second write request to the first storage control unit.

Growing community of inventors

Tokyo, Japan

Takeshi Ido