Hitachi, Ltd.

Takahide Okuno

Atsushi Ishikawa

Tetsuya Shirogane

Koji Iwamitsu

Mitsuhide Sato

Toshiaki Minami

Kousuke Komikado

Hiroaki Yuasa

Provided is a storage subsystem capable of improving the data processing speed by balancing the load on processors and controllers. This storage subsystem includes a controller for controlling the input and output of data to and from a storage apparatus that provides to a host computer a plurality of logical units to become a storage extent for the host computer to read and write data, processes a command issued by the host computer, and has a storage resource in relation to the logical unit. The controller has a local memory for storing the command, and a processor configured from a plurality of cores for controlling the input and output of data to and from the logical unit to be subject to the input and output of the data based on the command. The local memory stores association information representing the correspondence between the plurality of logical units and the plurality of cores. Each of the plurality of cores processes the command to the logical unit to be handled by a self core based on the association information and executes I/O processing of the data to the logical unit.

Storage subsystem and remote copy system using said subsystem

Proposed is a storage controller and its control method for speeding up the processing time in response to a command in a simple manner while reducing the load of a controller that received a command targeting a non-associated logical volume. This storage controller includes a plurality of controllers for controlling the input and output of data to and from a corresponding logical unit based on a command retained in a local memory, and the local memory stores association information representing the correspondence of the logical units and the controllers and address information of the local memory in each of the controllers of a self-system and another-system. Upon receiving a command sent from a host computer, the controller determines whether the target logical unit is associated with the controller of a self-system or another-system based on the association information, and, when the logical unit is associated with the other-system controller, the controller transfers and stores the command to and in the corresponding other-system controller based on the address information.

Storage controller and control method thereof

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Odawara, Japan

Takahide Okuno