Hitachi, Ltd.

Other

Hitachi Information Technology Co., Ltd.

Takahisa Kimura

Katsunori Nakamura

Takeshi Koide

Teruo Nagasawa

Koji Ozawa

Kazuhito Suishu

Tooru Suzuki

Kosaku Kambayashi

Hitoshi Shiozawa

Hiroji Shibuya

Shigeru Kishiro

Keiichi Kaiya

Mika Teranishi

Yasushi Saitsu

A storage controller of the present invention can specify an updated file based on an updated block detected when a differential backup is carried out for a plurality of generations, and can carry out a virus scan for the updated file only. Difference data generated between a primary volume and a backup volume is managed in difference volumes of different generations. A file updated by the host is specified based on an updated block in which the difference data is stored. A virus scan, which makes use of the latest virus pattern file, is executed for this updated file. Furthermore, search information related to the updated file can be created, and this search information can also be saved.

Storage controller, storage system, and storage controller control method

In the present invention, the scope and degree of the effect of hardware alterations on software is grasped, and development is performed while making coordination between software and hardware. The storage system comprises a plurality of hardware elements and a plurality of software elements, and these respective elements are connected via a plurality of interface elements. The development support system respectively acquires and analyzes specification information relating to the hardware elements and software elements comprising the storage system, and produces software effect information that indicates the effect on the software. The development sections promote cooperative development while referring to the software effect information.

Storage controller software development support system and software development support method

With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.

Method and apparatus for data duplexing in storage unit system

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

According to the present invention, techniques for performing real time backup of data in the presence of a pending hazard, such as a natural disaster, or the like. Embodiments can provide data storage controllers, networked data storage systems, methods and the like, that detect imminent hazardous conditions and alter backup behavior to provide greater integrity of backed up data. In a representative embodiment according to the present invention, update of the primary data is temporarily suspended after the recognition of a probable occurrence of a hazardous event. By suspending updating the primary data temporarily, the increase of un-updated secondary data can be prevented, so that lost data is decreased. Then, the un-updated secondary data can be updated quickly or exclusively, in order to avoid un-updated secondary data.

Data backup in presence of pending hazard

A storage system and method are provided and feature a highly available remote copying function and site switching capability. A redundant constitution to a sequencing generator for producing sequence information is provided. In a remote copy configuration, a sequence generator is provided at the copy destination site, in addition to the copy source site. The sequence generators are configured for redundant operation for site switching.

Remote mirroring with write ordering sequence generators

Subsystem and method of reorganizing multiplexed data

According to the present invention, techniques for performing real time backup of data in the presence of a pending hazard, such as a natural disaster, or the like are disclosed. Embodiments of the invention provide data storage controllers, networked data storage systems, methods and the like, that detect imminent hazardous conditions and alter backup behavior to provide greater integrity of backed up data. In a representative embodiment according to the present invention, update of the primary data is temporarily suspended after the recognition of a probable occurrence of a hazardous event. By suspending updating the primary data temporarily, the increase of un-updated secondary data can be prevented, so that lost data is decreased. Then, the un-updated secondary data can be updated quickly or exclusively, in order to avoid un-updated secondary data.

By assuring and maintaining consistency of data within a range expected by the user, significance of the consistency of data is assured. A master control unit to which write data and its write time is transferred from an information processor is provided with a function of obtaining the latest write time and the oldest write time of write data which has not been copied to each of remote control units as a copy destination at proper timings and comparing the difference between the latest and oldest write time with a preset time on the basis of a data consistency unit such as a data set. When the difference reaches or exceeds the present time, data within the data consistency assuring range is suspended or write data and copy data is regulated.

Growing community of inventors

Odawara, Japan

Takahisa Kimura