Fujitsu Corporation

Yoshimasa Mishuku

Kenichi Fujita

Hidejirou Daikokuya

Hiroshi Murayama

Hiroyuki Yamashita

Kazunori Kobashi

Tomohiro Uno

Yasuhito Kikuchi

Akito Yamazaki

A virtualization controller identifies a node that manages a segment to be accessed, and instructs the node to access the segment. A mirror controller of the node instructed to access the segment writes data in the segment managed by the node and in a segment having a mirror relation with the segment managed by the node.

Storage device, storage system and non-transitory computer-readable storage medium for mirroring of data

A control module that manages a segment to which data is written implements write processing and resynchronization processing using a bitmap managed for each LUN. In other words, the control module stores the bitmap for the managed LUN in a bitmap storage unit. A mirror LUN control unit sets a corresponding portion of the bitmap to 1, controls data write to a target segment and a mirror segment, and resets the bitmap to 0 when the data write to both of the segments is complete. A resynchronization control unit refers to the bitmap storage unit to perform the resynchronization processing.

Storage control device and storage system

A storage controller out of a plurality of storage controllers used in a storage system, each of the plurality of storage controllers being configured to control mirror processing of data, the storage controller comprising: circuitry configured to: determine a storage controller of a destination of an input and output request for a volume, out of the plurality of storage controllers, based on mirror device information where identifiers and priorities of the respective storage controllers are stored while being associated with each other for each of mirror processing units, and state information being for each of storage controllers and indicating whether the storage controller is normal or not, and issue the input and output request to the determined storage controller.

Storage controller, method, and storage medium

The first storage area stores original data of an update target that is to be updated by a host. The controller divides data to be written over the original data of the update target stored in the first storage area into a plurality of pieces of update data and thereby distributes the plurality of pieces of update data for each of successive addresses. The second storage area stores the plurality of update data distributed by the controller. The third storage area stores information in which an update area address, which is an address of the first storage area to be overwritten by the plurality of pieces of update data of the original data of the update target, is associated with a storage destination address, which is an address of the second storage area that has stored the plurality of pieces of update data.

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Yokohama, Japan

Yoshimasa Mishuku