Fujitsu Corporation

Takeshi Miyamae

Yoshitake Shinkai

Masahisa Tamura

Takanori Nakao

Kensuke Shiozawa

Shenbin Zhang

Takeo Honda

Song Hua

A storage medium storing an information management program that causes a computer to execute a process that includes acquiring a first cumulative consideration amount from a most upstream process in a plurality of processes included in a supply chain to a first process; generating a consideration amount commitment by concealing the first cumulative consideration amount by using a random number; registering the consideration amount commitment in a blockchain; generating a consideration amount proof that is a zero knowledge proof that proves validity of the second cumulative consideration amount without disclosing the second cumulative consideration amount; and notifying the second process of the second cumulative consideration amount, the random number, and the consideration amount proof.

Storage medium, consideration distribution method, and information management device

A computer-readable medium storing a program for causing a computer to execute processing in one of stages of a supply chain, the processing including: obtaining, from an immediately upstream stage, a first cumulative value being from a most upstream stage to the immediately upstream stage and a first random number used to generate a first commitment obtained by concealing the first cumulative value; generating, based on the first random number, a link commitment obtained by concealing information indicating a relationship between the immediately upstream stage and the stage; calculating, based on the first cumulative value, a second cumulative value being from the most upstream stage to the stage; generating a proof indicating that the second cumulative value is calculated using the correct first cumulative value and that is a zero-knowledge proof based on the link commitment; and causing the link commitment and the proof to be recorded in a blockchain.

Computer-readable recording medium storing information concealing program, method of concealing information, and information management apparatus

An unauthorized use detection system includes apparatuses and a hash chain that records, for each piece of data, a data structure that includes a hash value of entire data and hash values calculated with respect to a plurality of partial areas obtained from a specific procedure using the hash value of the entire data. One of the apparatuses reads out the data structure associated with the data of one of comparison targets from the hash chain. The apparatus calculates, regarding data of the other one of the comparison targets, hash values of the plurality of partial areas obtained from the specific procedure using the hash value of the entire data included in the read data structure. The apparatus compares the hash values of the plurality of partial areas included in the read data structure with the calculated hash values of the plurality of partial areas related to the other one.

Unauthorized use detection system, information processing apparatus, computer-readable recording medium and unauthorized use detection method

A blockchain method generates data on a new blockchain by linking a new block to data on a blockchain including a plurality of blocks linked together each being a set of data containing given information. The blockchain method may further includes: in generating a second block following a first block included in the data on the blockchain, identifying, among branch blocks approved prior to the generating of the second block, one or more blocks capable of being approved in parallel with the first block, and generating and registering, in a memory, the second block following the first block and the one or more blocks capable of being approved in parallel with the first block.

Blockchain program and blockchain method

A non-transitory computer-readable storage medium storing a program that causes a first computer to execute a process, the process including, receiving an update request from a second computer, the update request including an identifier of data stored in a storage device, an arithmetic operator of a calculation for the data, and an argument value used for the calculation, the calculation being one of four arithmetic calculation and bit calculation, the data being stored in the storage device that denies an access from the second computer, executing the calculation for a value of the data based on the arithmetic operator and the argument value, the calculation executed by the first computer being limited to the four arithmetic calculation or the bit calculation, updating the value of the data to an output value of the executed calculation, and transmitting response information corresponding to the update request to the second computer.

Non-transitory computer-readable storage medium, and information processing device and method

A storage system includes a first information processor, a second information processor, and a superordinate device. The first information processor includes a first memory device that stores therein the data, a difference generator that generates difference data representing a difference between updating data received from the superordinate device and the data stored in the first memory device before updating, a second memory device stores therein the generated difference data, and a data transmitter that transmits the stored difference data to the second information processor. The second information processor includes a third memory device that stores therein the parity, a data receiver that receives the difference data transmitted from the data transmitter, and a parity difference applier that generates a post-updating parity that is to be written into the third memory device by applying the received difference data to the stored parity before the updating.

Storage system, information processor, and computer-readable recording medium having stored therein program for generating parity

An information processing device includes: a memory; and a processor coupled to the memory and the processor configured to: generate compressed data, in sets of a prescribed size, in respect of one set of object data, in accordance with each of a plurality of compression methods; and select compressed data of the compression method which has completed compression of the object data first, among the plurality of compression methods.

Information processing device, data compression method and data compression program

A storage system includes an information processing apparatus and plural storage nodes. A replication unit replicates plural data elements respectively stored in plural data regions of one of the plural storage nodes, and stores replicated data elements respectively in plural data regions of each of the other storage nodes. A parity generation unit generates a parity corresponding to the data elements respectively stored in the plural data regions, and stores the parity in the parity region, for each of the storage nodes. The data selection unit selects one or more data regions that hold data elements, from among the plural data regions, and releases one or more non-selected data regions, for each of the storage nodes, so as to reduce a multiplicity of the data elements respectively stored in the plural data regions of each of the plural storage nodes.

Storage system and information processing apparatus

A storage control device includes a processor. The processor is configured to acquire, when a first fault has occurred in a first storage device, first storage data to be used in recovery of the first storage device from a plurality of first storage control devices. The processor is configured to derive, when a second fault has occurred in a second storage device controlled by a second storage control device, first processed data from the first storage data. The first processed data is to be used in recovery of the second storage device. The processor is configured to notify the second storage control device of the first processed data.

Storage control device and data recovery method

A parity-layout generating method, includes: creating a first local parity layout with a first calculation range for calculating local parity; creating a second local parity layout with a second calculation range for calculating local parity, a length of the second calculation range being different from a length of the first calculation range; and creating, by a computer, a third local parity layout with the first calculation range and the second calculation range by combining the first local parity layout and the second local parity layout.

Parity-layout generating method, parity-layout generating apparatus, and storage system

A storage system includes a plurality of data disks that store information, and a parity disk that corresponds to a disk group including some of the plurality of data disks and stores parity information generated on the basis of data of the data disks included in the corresponding disk group. Any of the data disks is included in a plurality of the disk groups.

Storage system

A disclosed information processing system includes plural information processing apparatuses connected with a network. One of the plural information processing apparatuses includes: a first allocation unit to identify, for each subnetwork of plural subnetworks included in the network, one information processing apparatus from among information processing apparatuses included in the subnetwork, and assign to the identified one information processing apparatus, a first Reduce processing that is a processing to summarize results of a Map processing executed for data held in the information processing apparatuses included in the subnetwork; and a second allocation unit to allocate to any one of the plural information processing apparatuses, a second Reduce processing that is a processing to summarize results of the first Reduce processing executed for each subnetwork of the plural subnetworks.

Information processing system and control method thereof

A volume migration method for causing to carry out a migration from a first volume manager to a second volume, includes: by causing the first volume manager to carry out actual accesses, obtaining information of correspondence, by the first volume manager, between logical volume offsets and physical blocks on a physical medium; judging, based on the obtained information of the correspondence, whether or not an exceptional data layout is carried out; and when it is judged that the exceptional data layout is not carried out, updating only a header area on the physical medium for the second volume manager. Incidentally, the aforementioned obtaining is carried out by using a program module for blocking access by the first volume manager to the physical medium. Thus, when only the header area is updated after it is confirmed the exceptional data layout is not made, the high-speed volume migration becomes possible.

Volume migration program, method and system

A disclosed method includes acquiring and a forward log and extracting forward file operations applied to files in an order of applying these from the forward log, specifying generation rules for generating backward file operations with reference to the forward file operations, generating the backward file operations by the specified generation rules and recording these, and applying the forward file operations to the files not having the extracted forward file operations applied and also applying the backward file operations to the files having the forward file operations applied to recover the files not having the forward file operations applied.

File management apparatus, method, and program

A computer-readable recording medium stores therein a data transfer processing program that causes a computer capable of accessing plural recording devices to acquire a group of update data for a first recording device among the recording devices and calculate, based on addresses respectively assigned to each data item in the group of update data, an overlap rate of the addresses. Further, based on the overlap rate calculated at the calculating, the computer selects a data transfer scheme from among a synchronous scheme of transmitting the group of update data simultaneously to the first recording device and a second recording device, and a nonsynchronous scheme of transmitting the group of update data to the first recording device and subsequently causing the first recording device to transmit the group of update data to the second recording device; and executes the data transfer scheme selected.

Growing community of inventors

Kawasaki, Japan

Takeshi Miyamae