Fujitsu Corporation

Kazuichi Oe

Kazutaka Ogihara

Masahisa Tamura

Tatsuo Kumano

Yasuo Noguchi

Takashi Watanabe

Yoshihiro Tsuchiya

Tetsutaro Maruyama

Toshihiro Ozawa

Munenori Maeda

Ken Iizawa

Jun Kato

Motoyuki Kawaba

Shigeyuki Miyamoto

Minoru Kamoshida

Minoru Kamosida

Satoshi Iwata

Riichiro Take

An apparatus includes a memory that stores information managing whether a writing access to a storing region of a first storing device is present or absent for each of second-sized partial regions obtained by dividing a first-sized storing region by a given value; and a processor configured to: in response to an instruction to migrate first-sized target data from the first storing device to a second storing device having an access speed lower than that of the first storing device, when a number of accessed partial regions in a storing region of the target data is larger than a threshold, migrating the target data in a unit of the first size; otherwise migrating data in the accessed partial regions in a unit of the second size; calculating a first/second migration time periods that the migrations of the first/second size takes; and changing the threshold based on the calculating.

Information processing apparatus and non-transitory computer-readable recording medium having stored therein information processing program

An apparatus monitors an access load state of a plurality of logical volumes of a first storage device, and determines that an access load state of a subset of the plurality of logical volumes has changed from a high load state to a low load state. The apparatus migrates, when the subset of the plurality of logical volumes remains in a low load state after an elapsed setting time since the load state of the subset of the plurality of logical volumes changed from a high load state to a low load state, data stored in the subset of the plurality of logical volumes to a second storage device having an access rate lower than the first storage device.

Information processing apparatus and storage control method therefor

The hierarchical storage device includes: a collecting unit collecting access information related to each unit area included in a first storage device; a first specifying unit specifying a movement target area in the first storage device using a first parameter based on the access information collected by the collecting unit; a second specifying unit specifying a movement target area candidate in the first storage device using each parameter based on the access information; a counting unit counting a number of occurrences of data accesses to the movement target area candidate specified per parameter by the second specifying unit, based on the access information; and an updating unit determining as a recommended parameter the parameter whose number of occurrences of data accesses counted by the counting unit is the largest, and updating the first parameter used by the first specifying unit using the recommended parameter, and can efficiently exhibit device performance.

Hierarchical storage device, hierarchical storage control device, computer-readable recording medium having hierarchical storage control program recorded thereon, and hierarchical storage control method

An IO access concentration is precisely predicted by comparing first concentration state tendency information and second concentration state tendency information indicating a tendency of a concentration state of a unit region being in the concentration state, the first concentration state tendency information being collected during a first time period, the second concentration state tendency information being collected during a second time period prior to the first time period, and when the first concentration state tendency information is detected to vary by a standard value or more from the second concentration state tendency information, regenerating a data access prediction information by excluding a data access history collected during the second time period.

Information processing apparatus, non-transitory computer-readable recording medium having stored therein a program for controlling storage, and method for controlling storage

An information processing apparatus controlling moving of data stored in a first storage region selected from a plurality of storage regions of a first storage device to a second storage device, the apparatus is configured to execute a collection of logs of accesses, specify the first storage region as an access concentration region based on the logs, move first data stored in the first storage region to the second storage device, specify a transition speed of the access concentration region, specify a first time period until the number of the accesses to the first storage region becomes the first number, at a first time, execute a prediction procedure predicting that the number of accesses to a second region becomes equal to or greater than the first number at a second time after the first time, based on the transition speed and the first time period.

Information processing apparatus and method executed by an information processing apparatus

A management apparatus includes a memory and a processor coupled to the memory. The processor is configured to: sequentially read data from a movement-target storage area of a storage device included in a first storage apparatus when the data stored in the movement-target storage area is to be moved from the first storage apparatus to a second storage apparatus which is accessible at a higher speed than the first storage, the first storage apparatus including the storage device and a cache memory configured to cache the data stored in the storage device using a write-back scheme; read changed data among the pieces of data in the movement-target storage area from the cache memory; merge data read from the movement-target storage area and the changed data read from the cache memory; and write merged data to the second storage apparatus.

Management apparatus, storage system, method, and computer readable medium

A storage control device controlling a storage system including a first storage device and a second storage device, the first storage device and the second storage device include a plurality of regions for storing data, respectively, a data transmission between the first storage device and the second storage device is executed by the region, the storage control device includes a memory, and a processor coupled to the memory and configured to determine a first region of the first storage device as a first transmitting target region, the first region having a first size, transmit, from the first storage device to the second storage device, second data having a second size smaller than the first size, and based on a response performance of the storage system during the transmitting of the second data, transmit first data stored in the first region from the first storage device to the second storage device.

Storage control device, storage system and method of controlling a storage system

An information processing device includes a processor. The processor is configured to allocate a plurality of allocation unit areas to a virtual volume from a first storage device and a second storage device. The processor is configured to generate evaluation information related to access for each of a plurality of divided areas into which each of the plurality of allocation unit areas is divided. The processor is configured to determine based on the generated evaluation information, when allocation to the virtual volume is changed from a first allocation unit area of the first storage device to a second allocation unit area of the second storage device, a first data transfer order of transferring data in divided area units from the first allocation unit area to the second allocation unit area. The processor is configured to transfer the data in accordance with the first data transfer order.

Storage system and method for allocating virtual volumes based on access frequency

A storage apparatus is provided, including a first storage device; a second storage device having an access speed higher than an access speed of the first storage device; a monitor that monitors a write access load for the first storage device; a comparator that compares the write access load for the first storage device monitored by the monitor, with a load threshold; and a switch that causes write access target data to be written into the first and second storage devices, when it is determined by the comparator that the write access load for the first storage device does not exceed the load threshold, while causing the write access target data to be written into the first storage device, when it is determined by the comparator that the write access load for the first storage device exceeds the load threshold.

Storage apparatus, method of controlling storage apparatus, and non-transitory computer-readable storage medium storing program for controlling storage apparatus

An apparatus is connected to a first storage and a second storage which is accessed at an access speed lower than an access speed of the first storage. The apparatus accesses each of blocks stored in the second storage, and counts, for each of the blocks, the number of accesses made for the each block. The apparatus determines, based on the number of accesses that has been counted for each of the blocks, a transfer target block that is a target which is to be transferred from the second storage to the first storage, and determines a transfer time at which transfer of the transfer target block is to be performed. The apparatus transfers the determined transfer target block to the first storage at the determined transfer time.

Apparatus and method for transferring data between storages having different access speeds

From unit storage areas each having a certain size in a first storage device, an extraction unit extracts, at certain time intervals, a monitored area formed by consecutive unit storage areas having been accessed at least a predetermined number of times that is greater than zero and being similar to each other in the number of times of access. When detecting movement between the positions of same-sized monitored areas among the extracted monitored areas over time, a prediction unit determines a predicted storage area predicted to be accessed in the storage area of the first storage device on the basis of the direction of the movement between the positions of the same-sized monitored areas, and performs a control operation so that the content of the predicted storage area is copied to a second storage device that provides faster access than the first storage device.

Prefetching monitored areas in a storage apparatus

A computer includes a memory that stores a program and received data; and a processor that executes an operation by executing the program stored in the memory, the operation including storing the received data into a first database having a first data structure in which reading is performed in a random access manner and writing is performed in a sequential access manner, when the received data is received from a second apparatus is as same as data stored in a first apparatus which has a failure, and copying the received data stored in the first database to a second database having a second data structure in which reading is performed in a sequential access manner and writing is performed in a random access manner.

Computer, data storage method, and information processing system

A transfer data block is selected, and a data file including the transfer data block is selected as a transfer data file. All the data blocks of the transfer data file are added to the transfer data block. When all the data files including each transfer data block is selected as a transfer data file, the transfer data block is selected as a deletion data block. When a total data amount of the deletion data block is larger than or equal to a predetermined target deletion data amount and a ratio of a total data amount of the transfer data block to the total data amount of the deletion data block is smaller than or equal to a predetermined value, the data file is transferred from a transfer source node to a transfer destination node. Accordingly, a storage can be used efficiently.

Transfer control device, non-transitory computer-readable storage medium storing program, and storage apparatus

A storage system includes: a first storage unit; a second storage unit that has an access speed higher than an access speed of the first storage unit; and a storage controller that collects load information about respective loads in a plurality of areas in the first storage unit, selects a candidate area in the first storage unit which is to be migrated, based on the collected load information, and migrates data in the selected candidate area, to the second storage unit.

Storage controller, storage system, method of controlling storage controller, and computer-readable storage medium having storage control program stored therein

A first information processing apparatus transmits a message storing a replica of data stored in the first information processing apparatus. The message has an unspecified destination. A first relay apparatus detects a second information processing apparatus provided in a network to which the first relay apparatus belongs. The first relay apparatus selects, as a transfer destination of the message, the second information processing apparatus or a second relay apparatus upon receiving the message. The first relay apparatus transfers the message to the selected transfer destination. The second information processing apparatus stores the replica therein upon receiving the message.

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Yokohama, Japan

Kazuichi Oe