Hitachi, Ltd.

Microcomputer Engineering Ltd.

Kosaku Kambayashi

Katsunori Nakamura

Koji Ozawa

Kazuhito Suishu

Takahisa Kimura

Hitoshi Shiozawa

Dai Taninaka

Akira Yamamoto

Toshio Nakano

Yoshihiro Asaka

Takao Satoh

Masafumi Nozawa

Hiroyuki Kitajima

Akira Kurano

Shigeo Honma

Teruo Nagasawa

Yoshiro Shiroyanagi

Toshiaki Tsuboi

Taisuke Kurokawa

Seiji Shima

A storage controller that performs user-friendly information display, simplifies updating of support information, has external storage controllers to provide sufficient input/output performance, and expands the range of external storage controllers to be supported; and a controlling method for that storage controller. The storage controller includes a code extract/convert unit for converting a first code indicating a vendor name and/or device name of an external storage controller, obtained based on inquiry data transmitted from the external storage controller, into a second code indicating a real vendor name and/or real device name of the external storage controller. The storage controller creates support information that compiles information of each model regarding whether or not it can be connected to the respective external storage controllers. Furthermore, a path control system and a timeout time can be set for the respective external storage controllers.

Storage controller and controlling method therefor

This storage apparatus has a plurality of units for transferring or storing data sent from an information processing device, and includes a failure notification unit for notifying a failed unit among the plurality of units, a power supply switching command unit for commanding the switching of off and on of the power supply of the failed unit notified from the failure notification unit, and a power supply switching unit for switching off and thereafter switching on the power supply of the failed unit according to the command of the power supply switching command unit.

Storage apparatus and power supply control method thereof

A device which is subject to management by the management unit comprises a storage region for storing device status information, which is information indicating a status relating to the device, and control sections for sending the device status information stored in this storage region to the management unit.

System and method for managing devices

Disk units operable under control of different disk control units hold the same data. Under circumstances in which data is duplexed, when data is duplexed again after data that is generally saved as backup data was accessed for reading and writing, in order to efficiently duplex data, update places of both original data and sub-data updated during the duplexing of data is interrupted are registered on an access information management table of an original disk control unit. When the original disk control unit receives a duplexing resume command, the duplexing of data may be efficiently reorganized by copying original data corresponding to an access place produced during the duplexing is interrupted from information of the access information management table to the backup data or by copying the backup data to the original data.

Subsystem and method of organizing multiplexed data

Subsystem and method of reorganizing multiplexed data

A disk cache control unit disposed between an upper-rank processor and a disk unit, comprising a cache memory for holding a copy of data stored in the disk unit, at least one first interface controller which checks, in response to an input/output command requesting data to be read from the upper-rank processor, whether or not the data requested by the command is stored in the cache memory, and requests a head positioning of the disk unit when the data is not stored in the cache memory, and a second interface controller which indicates head positioning to the disk unit in response to a head positioning request, notifies the completion of the head positioning to the first interface controller in response to a notice of the completion of the head positioning, and which reads data from the disk unit and stores the data in the cache memory when a data transfer request did not come in a specified time period set to read data from the disk unit without a rotational delay after a notice of the head positioning head been given to the first interface controller and the subsequent transfer of data from the second interface controller had been completed, and which gives a notice of storage of the data in the cache memory through memory means to the first interface controller, and in response to this storage notice, the first interface controller reads the data from the cache memory and transfers the data to the upper-rank processor.

Disk cache control unit

In a control unit having a external storage device, a method for selecting a loading method of data stored in the cache memory into the cache memory in accordance with an access pattern to the data, and an apparatus therefor are disclosed. The selection of the loading method is selection of control mode or procedure in accordance with the loading method, and it is attained by a learn function.

Memory controller with a cache memory and control method of cache memory

Growing community of inventors

Odawara, Japan

Kosaku Kambayashi