Hitachi, Ltd.

Jun Nemoto

Takahiro Nakano

Masaaki Iwasaki

Nobuyuki Saika

Atsushi Sutoh

Masakuni Agetsuma

Takaki Nakamura

Hitoshi Kamei

Mitsuo Hayasaka

Yohsuke Ishii

Yoji Nakatani

Koji Sonoda

Shimpei Nomura

Kaiho Fukuchi

Takayuki Nagai

Hitoshi Arai

Takanobu Suzuki

Akiyoshi Tsuchiya

Etsutaro Akagawa

Tatsuya Sato

Masaki Iwasaki

Nishio Yamada

Operation management with consistent policies and timings between nodes even in a situation where there are a plurality of administrators in the distributed ledger system is realized. In an operation management systemfor a distributed ledger systemcomprising a plurality of nodes, each of at least two or more predetermined nodes in the plurality of nodes manages an operation smart contractfor operation management of the distributed ledger system with a distributed ledger, when at least one node in the two or more predetermined nodes receives a transaction, the node which has received the transaction judges whether or not a type of the transaction is the operation smart contract, and, based on the judgment result, executes the operation smart contract

Operation management method, operation management system, and operation management program

Provided is a distributed ledger device, aiming at easily and appropriately determining a status of operational processing on a distributed ledger in a certain distributed ledger device at another distributed ledger device. A BC node in a BC system including a plurality of BC nodes that manage a distributed ledger for a predetermined target transaction, the BC node including: the storage device; and the processor, in which the storage device stores the distributed ledger, and the processor, when executing processing relating to the distributed ledger, transmits content information indicating contents of the processing to be managed by another BC node that manages the distributed ledger. The processor may transmit an instruction to register the content information in another distributed ledger managed by the plurality of BC nodes that manage the distributed ledger.

Distributed ledger device, distributed ledger system, and distributed ledger management method

The time required for recovery in a distributed computing system can be reduced. At least one node (for example a server) or a different computer (for example a management server) are provided in the distributed computing system which includes a plurality of nodes existing at a plurality of sites. One or more sites at which one or more nodes that hold one or more datasets identical to one or more datasets held by a node to be recovered are identified. For the recovery, it is determined, on the basis of the one or more identified sites, a restore destination site that is a site of a node to which the one or more identical datasets are to be restored from among the plurality of sites.

Method and system for recovering data in distributed computing system

A storage unit stores first data including the processing target information and second data including processing history information obtained by processing the processing target information based on a processing request; the first data and the second data include a plurality of data associated with different transactions; servers include a first server and a plurality of second servers; the plurality of second servers synchronize and hold the first data and the second data; and the first server that has received the processing request reads the first data of a processing target from a second server, processes the processing request, stores the second data including the processing history information and the first data reflecting a processing result in an own server, and transmits the second data configured to reflect the processing in the first data of the second server to the second server.

Data management method and data management system

A data deduplication device reduces a processing load in deduplication. Storage target data includes a content including a plurality of blocks having a structure in which transaction data and a hash value of a preceding block are associated with each other. A storage includes a storage device and a processor, which (1) acquires a hash value associated with one or more blocks of a chunk including the block in the content, and specifies a fingerprint corresponding to the chunk based on the acquired one or more hash values of the block, (2) determines whether the fingerprint corresponding to the chunk is the same as a fingerprint of a chunk stored in the storage device, and (3) does not store the chunk in the storage device when it is determined to be the same, and stores the chunk in the storage device when it is determined to not be the same.

Data deduplication device, data deduplication method, and data deduplication program

The computer system executes environment classification of classifying a plurality of subsystems, each being a physical or virtual computer system, into one or more environment groups being one or more groups. The computer system stores classification result data which is data representing a relationship between the environment group and the subsystems belonging to the environment group. The computer system selects, from the classification result data, the environment group to which the subsystem having undergone a problem belongs. The computer system generates a reproduction subsystem which is a virtual subsystem virtually reproducing the subsystem for each of the subsystems belonging to the selected classification result group. The computer system applies the countermeasure to at least one reproduction subsystem for the purpose of verifying the countermeasure for the problem.

Countermeasure verification assistance system and method

In a computer system according to an embodiment of the present invention, a first slave server includes copy management information associating a master file system identifier with an identifier of a slave server including a copy of the master file system identified by the master file system identifier. The first slave server acquires a copy of a part of a master file system. The copy includes a stub-state object (file or directory). The first slave server searches the copy management information for a slave server to be queried regarding information for materializing the stub-state object. If the slave server to be queried includes the information for materialization, the first slave server materializes the stub-state object using the information for materialization acquired from the queried slave server.

File sharing system and file sharing method

When performing migration of data from a migration source file server which is not endowed with any HSM interface, to a migration destination file server which is endowed with HSM, a volume of high capacity is needed for the migration destination file server, and moreover the performance deteriorates directly after the migration. However, with this system, the manager is enabled to set a migration policy using attribute information which can be acquired through a standard file access interface possessed by a file server program, and, when setting the attribute information of the migration destination file, the tier of the file which is to be created is determined, and the migration destination file is created, on the basis of this attribute information and migration policy.

Data migration system and data migration method

Regarding a method for migrating a file system by copying a file from a migration source to a migration destination and deleting the file at the migration source, a retention of a file in a page (allocation unit of a thin provisioning function) is either suppressed or solved, and two methods are proposed for solving the problems and for enabling migration of a file system in which the increase of utilization of storage capacity is suppressed, wherein one method changes the location of a file prior to performing copying so that the file to be copied next is located in the same page, and another method creates a reverse index table to recognize which block is used by files, thereby enabling to specify the file remaining within a page and copy the same by referring to this reverse index table.

Storage system

It is provided a storage system including a storage device for storing data, and a controller for controlling data read/write in the storage device. The controller includes a processor for executing a program, and a memory for storing the program that is executed by the processor. The processor executes deduplication processing for converting a duplicate part of data that is stored in the storage device into shared data, and calculates a distributed capacity consumption, which represents a capacity of a storage area that is used by a user in the storage device, by using a size of the data prior to the deduplication processing and a count of pieces of data referring to the shared data that is referred to by this data.

Storage system, storage system control method, and storage control device

Root node arrangements configured to carry out file level virtualization for logically providing a plurality of share units that can be shared among file systems of the root node or other one or more root nodes, to a client.

Root node for file level virtualization

Difference information between two snapshots from a first point-in-time snapshot, which has been copied, to an N.sup.th point-in-time snapshot, which constitutes the latest point-in-time snapshot, is acquired to a memory module. The memory module stores two or more pieces of difference information. The two or more pieces of difference information comprise difference information that shows the difference between a first point-in-time snapshot and any snapshot other than the first point-in-time snapshot of N snapshots. Copy difference information, which is information that shows the difference between the first point-in-time snapshot and a specified snapshot from among N snapshots, and which is used in copying the specified snapshot, is created on the basis of the two or more pieces of difference information.

Storage controller and storage control method for snapshot acquisition and remote copying of a snapshot

System and method of acquiring and copying snapshots

The client computer which transmits an access request specifying an object existing in the first file system and the second computer which accesses the second file system are connected to the first computer which accesses the first file system. The second file system includes a shared directory. A specific object which is an object complying with the path name including the name determined in accordance with the type of the second computer is stored in the shared directory. The controller mounts the shared directory to the first file system. The controller creates a link which comprises a name determined in accordance with a certain naming regulation independent of the type of the computer and corresponds to the specific object in the first file system.

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Yokohama, Japan

Jun Nemoto