Hitachi, Ltd.

Hitachi Software Engineering Company, Ltd.

Takeo Fujimoto

Shigeru Kishiro

Toshio Nakano

Yutaka Takata

Katsuhiro Okumoto

Hisao Honma

Osamu Sakaguchi

Kei Sato

The storage controller of the present invention is able to reduce the amount of purge message communication and increase the processing performance of the storage controller. Each microprocessor creates and saves a purge message every time control information in the shared memory is updated. After a series of update processes are complete, the saved purge messages are transmitted to each microprocessor. To the control information, attribute corresponding to its characteristics is established, and cache control and purge control are executed depending on the attribute.

Storage controller and method of controlling storage controller

A storage apparatus that provides a dynamically extensible virtual volume for a host apparatus that accesses the virtual volume is characterized by including: a management unit setting part for setting a management unit, with which an area for storing data sent from the host apparatus is divided on a predetermined-area basis for management, for a pool area that provides a storage area to be assigned to the virtual volume; and a management unit resetting part for resetting the management unit set by the management unit setting part via analysis of the status of access from the host apparatus to the data at a predetermined time to make the management unit optimum for the status of access from the host apparatus to the data.

Storage apparatus and management unit setting method

An object of the present invention is to provide a storage controller capable of facilitating extension of storage capacity while suppressing investment related to storage capacity. The present invention has achieved the storing of system configuration information including content of a definition, set externally, of a virtual volume with storage capacity that is larger than a real storage capacity composed of the storage capacity of a storage device unit, and content of a definition, set externally, of at least one of a real volume formed as a result of dividing the real storage capacity, and a pool area; and communicating the storage capacity of the virtual volume based on the stored system configuration information in response to a storage capacity confirmation request from the host system, and, based on the system configuration information, writing or reading relevant data to or from a relevant address position in the storage device unit in response to a data input/output request from the host system designating an address in the real volume, and writing or reading relevant data to or from the pool area in response to a data input/output request from the host system designating an address in the virtual volume other than the real volume.

Storage controller and method for controlling the same

In a shared bus connection scheme or an individual path connection scheme, a fault caused at a part of a system affects the same in its entirety. Also, these schemes do not permit the determination of fault locations. Adaptersare connected to shared memorieswith a plurality of individual pathsthrough. An address locking unit (not shown) is arranged in each of the shared memoriesto perform address lock check on memory access operations from the adapters. If an address to be accessed is in the locked state, the access is held in the lock wait state until the address is unlocked. The access is made when the address locking is cleared.

Fault recovery method and a storage controller in an information processing apparatus

A storage subsystem in which write data written in a first storage subsystem from a plurality of host computers is copied onto a second storage subsystem, thereby protecting the write data in a multiplex manner. Disclosed are a storage subsystem and its controlling method in which the first storage subsystem has a storage control unit which sets a first threshold for controlling for each of the host computers an occupancy ratio of the write data whose copy to the second storage subsystem is incomplete in a data buffer in the first storage subsystem, and has control logic for delaying the processing of a data write request from each of the host computers on the basis of the first threshold.

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Odawara, Japan

Takeo Fujimoto