Fujitsu Corporation

Hideaki Omura

Koji Uchida

Hiromi Kubota

Akihito Kobayashi

Yoshinari Shinozaki

Shinichi Nishizono

Hidenori Yamada

Katsuhiko Nagashima

Tadaomi Kato

Mihoko Wada

Yasuhito Arikawa

Tsutomu Akasaka

Disclosed are a storage control apparatus, a storage control program, and a storage control method that collect the backup of storage data in units of generation at low cost. A storage control apparatus that creates a generation backup of a storage, comprising: a first copy section that creates a snapshot of at least one of all data stored in the storage at an indicated time point and difference data stored in the storage in an indicated time period; a second copy section that creates a mirror of at least one of all data stored in the storage and difference data stored in the storage in an indicated time period; and a controller that causes one of the first and second copy sections to copy all data stored in the storage and causes the other to copy difference data between generations stored in the storage.

Storage control apparatus, storage control program, and storage control method

A copy source device includes bit map acquisition and bit map merge functions. In accordance with bit-map management information in which a bit map indicating the presence of written data is rounded, the bit map acquisition and bit map merger acquires required bit map from a copy destination device, and merges the acquired bit map to a corresponding bit map of the copy source device. The copy destination device includes bit-map management information updater. The bit-map management information updater updates bit-map management information indicating a write operation when the write operation has been performed during a copy suspend mode. During a copy resume mode, the copy source device requests the copy destination device to transfer the bit-map management information, and in response, the copy destination device transfers the bit-map management information.

Data mirroring method

A disk array device includes a controller that sets a session pertaining to a copy source disk and a copy destination disk, and without copying the entire data that is recorded in the copy source disk to the copy destination disk, copies to the copy destination disk only the data that is recorded in a data space for writing. Further, if data for reading does not exist in the copy destination disk, the controller searches data from the copy source disk and transfers the searched data to a host computer.

Controller for a copy operation between a host computer and hard disks, a control method thereof, and a recording medium storing a program for executing the control method

An interdevice communication monitoring unit-calculates a variable timeout time (T&#x2212;T) by subtracting an elapsed time T from a predetermined fixed timeout time Tfor monitoring an intermodule communication to monitor an elapsed time of an intermodule communication. The fixed timeout time Tis a time shorter than a predetermined interface connection check time Tfor monitoring an interface connection with a channel. When the elapsed time T of the intermodule communication exceeds the variable timeout time (T&#x2212;T), the interdevice communication monitoring unit requests a channel to separate the interface connection, and then when an end response is obtained from a control module, requests the channel for an interface reconnection and then transmits an end response.

RAID apparatus, and communication-connection monitoring method and program

An access control method receives an access command, and permitting access to a cache segment accessed by the access command if no access range overlap occurs, even when a contention exists between a cache segment and an arbitrary cache segment that is already being accessed. The cache memory is segmented into the cache segments.

Access control method, disk control unit and storage apparatus

An input/output control device uses all of its cache memory effectively and allows cache memory modules to be added in increments of one. When cache memory included in the input/output control device is operating normally and the input/output control device receives a write request from a processing device, the input/output control device returns a write request completed response after writing data to cache memory as set forth in configuration information included in the input/output control device. The write data in the cache memory is then written to one or more disk devices asynchronously with the write completed response. When there is a problem with a cache memory module, the write data that was to be written to the region controlled by the cache memory module where the problem occurred is divided among the remaining cache memory modules. When adding more cache memory modules, the input/output control device writes data to the cache memory in response to a write request from a processing device based on the configuration information after the cache memory was increased and after the data was moved as set forth in the configuration information corresponding to the cache memory increase.

Disk input/output control device maintaining write data in multiple cache memory modules and method and medium thereof

File control apparatus adapted to be operatively connected to a host device for controlling a plurality of memory devices includes a cache memory for storing data blocks sent to or retrieved from the at least one memory device by the host. A control unit controls data transfer between the memory devices and the cache memory. A continuous data information generating device is included for generating continuous data information indicating whether the data blocks from the same memory device are updated continuously The control unit stores the continuously updated data blocks from the same memory device back to that same memory device as a single data block in accordance with a least recently used (LRU) scheme.

Growing community of inventors

Kawasaki, Japan

Hideaki Omura