Hitachi, Ltd.

Hitachi Vantara Corporation

Keiichi Matsuzawa

Mitsuo Hayasaka

Hitoshi Kamei

Yasunori Kaneda

Takahiro Nakano

Akira Yamamoto

Takaki Nakamura

Atsushi Sutoh

Takayuki Fukatani

Masaaki Iwasaki

Shinichi Hayashi

Koji Sonoda

Hitoshi Arai

Toshiomi Moriki

Noboru Morishita

Masayuki Kobayashi

Toshio Otani

Akiyoshi Tsuchiya

Ken Nomura

Naohiro Fujii

Akira Hayakawa

A question answering system includes a dangerous operation determination unit configured to determine whether question-answer pair data includes a dangerous operation, and an answer sentence replacement unit configured to replace, when it is determined that the dangerous operation is included, an answer sentence including a description of the dangerous operation included in a document by a replaced answer sentence depending on a classification of the dangerous operation, to thereby create replaced question-answer pair data.

Question answering system, question answering program, and question answering method

To provide a sentence data management method and a sentence data management system in which sentence data and a provision of a regulation are associated and a risk of legal violation associated with outbound transmission of the sentence data is reduced. A sentence data management system includes a processor configured to convert a word string of a first document described using a first term into a word string described using a third term; convert a word string of an outbound-transmitted second document described using a second term into a word string described using the third term; compare the first document and the second document by using a comparison result between the word string and the word string as a comparison result between the word string and the word string; and check a possibility of violation to the regulation in outbound transmission to determine the outbound transmission of the second document.

Method and system for restricting transmission of sensitive information contained in a document

A distributed storage system includes a plurality of storage nodes including: a storage device for storing data in such a way that the data can be written thereto and read therefrom; a memory in which a software program is recorded; and a CPU for executing the software program. The memory stores group management information in which a group configured with a plurality of storage nodes and the storage nodes that configure the group are associated with each other and recorded. The CPU converts data into a plurality of data blocks so that the data is redundant at a predetermined data protection level, and stores the data blocks into each of a plurality of storage nodes belonging to the same group based on the group management information.

Distributed storage system, data storage method, and software program

When a second storage device in a second site receives an update notification regarding a first element updated according to a write request from a first host, from a first storage device in a first site, for a second element specified on the basis of the update notification, the second storage device manages data of the first element corresponding to the second element as latest data. The first storage device provides a first volume capable of including a plurality of first elements. The second storage device provides a second volume capable of including a plurality of second elements corresponding to the plurality of first elements. When the second storage device receives a read request from a second host, the second storage device determines whether or not data of the first element corresponding to a read source second element (second element specified from the read request) is the latest data. When a determination result is true, the second storage device acquires the latest data from the first storage device and returns the latest data to the second host.

Storage system and data transfer control method

When a part already transmitted to an object storage is updated by a file system management section while a plurality of parts are being transmitted to the object storage, a file transfer section requests the object storage to generate a temporary object that is a temporarily generated object containing the transmitted and updated part by combining the parts transmitted before update, re-splits a file into a plurality of parts so that the transmitted and updated data and not-transmitted data are handled as parts different from transmitted and not-updated data, and transmits the part containing the transmitted and updated data or the part containing the not-transmitted data to the object storage.

File storage, object storage, and storage system

An example of storage system obtains a reference request of a reference request data block that is included in the content and is stored in the medium area. The storage system determines a number of gaps among addresses, in the medium area, of a plurality of data blocks continuous in the content including the reference request data block. The storage system determines, based on the number of gaps, whether or not defrag based on the plurality of data blocks is valid. The storage system writes, when the defrag is determined to be valid, the plurality of data blocks read from the medium area to the memory area, into continuous address areas of the medium area.

Storage system

It is provided a computer system comprising at least one storage apparatus and a computer, wherein the each of the at least one storage apparatus is configured to manage identification information indicating specifics of the stored data, and wherein the computer determines whether the data to be written to the one of the at least one storage apparatus has duplicate data, which is the same data already stored in any one of the at least one storage apparatus, transmits deduplicated data, and uses at least one of individual pieces of identification information or a range of pieces of identification information, depending on how many pieces of identification information appear in succession, to request the information indicating whether the data that is associated with the calculated identification information is stored from the one of the at least one storage apparatus.

Computer system, storage apparatus, and method of managing data

An allocation request for requesting allocation of a target virtual area with respect to target data issued to a system program includes a target ID corresponding to the target data. In response to the allocation request, whether or not the target ID is included in data map information is determined. When it is included in the data map information, the system program determines whether or not a target physical area is included in a storage apparatus. When the target physical area is included in the storage apparatus, the system program reserves a free area in a non-volatile memory as a target memory area, copies target data stored in the storage apparatus to the target memory area, changes the target physical area in the data map information to the target memory area, and writes an association between the target virtual area and the target memory area into the volatile memory.

Computer system, computer, and method to manage allocation of virtual and physical memory areas

A computer system, having: a physical computer, which includes a processor and a memory; and an external apparatus, which is coupled to the physical computer and which includes a storage apparatus, the physical computer further includes: a virtualization module for providing at least one virtual machine; a first failure monitoring module for detecting a failure in the physical computer and the virtualization module; a first memory dump module for copying, to the external apparatus, a first area in the memory which is allocated to the virtualization module; a second failure monitoring module for detecting a failure in the virtual machine; and a second memory dump module for copying, to the external apparatus, a second area in the memory which is allocated by the virtualization module to the virtual machine.

Computer system and memory dump method

When computers and virtual machines operating in the computers both attempt to allocate a cache regarding the data in a secondary storage device to respective primary storage devices, identical data is prevented from being stored independently in multiple computers or virtual machines. An integrated cache management function in the computer arbitrates which computer or virtual machine should cache the data of the secondary storage device, and when the computer or the virtual machine executes input/output of data of the secondary storage device, the computer inquires the integrated cache management function, based on which the integrated cache management function retains the cache only in a single computer, and instructs the other computers to delete the cache. Thus, it is possible to prevent identical data from being cached in a duplicated manner in multiple locations of the primary storage device, and enables efficient capacity usage of the primary storage device.

Storage device and computer system

A method switches file server from old file server to new file server which are coupled via a backend network and provides data synchronization. The old file server and new file server are coupled with one or more host computers via a frontend network to direct input/output (I/O) requests from the one or more host computers. The method comprises creating stub files in the new file server, the stub files including stub information indicating location of data in the old file server; switching I/O requests directed to old file server to I/O requests directed to the new file server; checking whether the new file server has any stub files; and, if the new file server has one or more stub files, recalling data corresponding to the one or more stub files from the old file server according to the stub information to replace the one or more stub files.

Data synchronization among file storages using stub files

In the present invention, when configuration data art a LFS (Log-Structured File system) is stored on a virtual volume constructed from a plurality of Storage mediums, a temporal change of the file size on the file system is roughly estimated. Then, in accordance with the change, a capacity that is needed on the virtual volume is provided, a cursor at the end of a log is set, and a write cursor for writing data is set so as to avoid the position behind the cursor at the end of the log. Accordingly, it is possible to, when the LFS occupies only a small area on the virtual volume, avoid early execution of the allocation of an available capacity, and thus avoid a circumstance in which a large number of storage mediums are needed at an early stage of the operation of the virtual volume (see).

When processing data via multiple computers, the number of computers can be increased or decreased without actually moving the data assigned to the respective computers, and the data can be arranged and processed so as to enhance the performance of the system in response to the increase of the number of computers. A plurality of computers for performing data processing stores target data to be processed in a shared storage system, and when data processing is to performed, the shared storage divides the storage area storing data corresponding to the number of computers, and creates virtual data storage areas referring to a portion of the storage area for each computer, so as to enable each computer to refer to independent virtual data storage areas and to complete data processing.

Distribution processing unit of shared storage

A file storage performs control to create a virtual parent file having an identifier capable of uniquely identifying a parent file among storage systems and volumes, and to acquire block layout information of the parent file using said identifier. The file storage creates a virtual parent file in the volume in which the clone file is created, and sets the file as a virtual parent file of the clone file so as to enable creation of a clone file of a parent file that exists in a different volume or a different storage system. Moreover, by combining creating the virtual parent file and switching the identifier of the parent file which is pointed by the virtual parent file, migration of clone files and parent files astride storage systems and volumes is enabled.

File storage system and file cloning method

An aspect of this invention is a computer system, including: a storage apparatus for allocating real storage areas of a plurality of tiers of a tiered real storage area pool to a volume, and migrating and relocating data within the volume between the plurality of tiers; and a host apparatus that accesses the volume provided by the storage apparatus. The host apparatus is configured to refer to tier information including information on a corresponding one of the plurality of tiers to which an access destination address within the volume belongs to identify the corresponding one of the plurality of tiers to which the access destination address belongs and refer to settings predetermined for the plurality of tiers to perform I/O control for the access destination address based on settings of the identified corresponding one of the plurality of tiers.

Growing community of inventors

Tokyo, Japan

Keiichi Matsuzawa