Abstract: 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.

Abstract: An access control apparatus includes a processor that executes a process including: reading first consecutive blocks from a storage device in response to an access request for a first data, the first consecutive blocks including a first block, storage areas of the storage device being managed in units of blocks; loading the first consecutive blocks into a memory area, storage areas of the memory area being managed in units of pages; and in accordance with a state of an access to a page in the memory area, invalidating a specific block of the storage device that corresponds to a specific page pushed out of the memory area, the specific page being pushed out as a consequence of loading the first consecutive blocks into the memory area, and writing second data included in the specific page to consecutive empty areas of the storage device.

Abstract: An access control apparatus includes a processor. The processor is configured to receive an access request for accessing first data. The processor is configured to read consecutive blocks that start with a first block containing the first data from a first storage unit. The processor is configured to load the consecutive blocks as corresponding consecutive pages into a memory area. The processor is configured to invalidate the consecutive blocks in the first storage unit. The processor is configured to write, before the loading, some of first pages held in the memory area into a contiguous empty area of the first storage unit in accordance with an access status of each of the first pages. The access status is whether each of the first pages has been accessed.

Abstract: An access control method includes: in response to a first access instruction that instructs accessing first data, reading the first data and second data from a storage and deleting the first data and the second data from the storage, the first data being read from a first storage area, the second data being read from a second storage area that is physically adjacent to the first storage area and is not an empty area; and in response to a second access instruction that instructs writing third data to the storage, writing the third data to a third storage area that is adjacent to a storage area located in a physically rearmost position among storage areas in which data has been stored in the storage.

Abstract: A storage apparatus is provided, including a first storage unit; a load information obtaining unit that obtains load information for each of a plurality of portions defined by dividing the first storage unit; a portion identifying unit that identifies a candidate portion that is to be relocated in the first storage unit based on the load information; a determining unit that determines whether or not data in the candidate portion is allowed to be migrated to a second storage unit, the second storage unit having a performance value higher than a performance value of the first storage unit; an adder that adds the second storage unit, when the determining unit determines that the data in the candidate portion is not allowed to be migrated; and a relocation unit that migrates the data in the candidate portion from the first storage unit to the added second storage unit.

Abstract: A first cache memory connects to a first storage module and stores part of information in the first storage module. A second cache memory connects to a second storage module and stores information in the second storage module. By using the information stored in the first or the second cache memory, a request processing unit reads or writes information from or to the first and the second storage modules. A change management unit changes connection such that the first storage module connects to the second cache memory. When a change is performed by the change management unit, a read control unit moves the information stored in the first cache memory to the second cache memory.

Abstract: An information processing device includes a first storage unit and a processor. The first storage unit is configured to store therein setting information designating a path range. The path range is one of a subset of a plurality of communication paths and a full set of the plurality of communication paths. The processor is configured to perform communication through a communication path included in a first path range designated by first setting information stored in the first storage unit. The processor is configured to acquire performance information of the respective communication paths included in the first path range. The processor is configured to select a second path range between the subset and the full set on basis of the acquired performance information. The processor is configured to store second setting information designating the selected second path range in the first storage unit.

Abstract: A computer-readable recording medium stores a program that causes a computer to execute a writing control process that includes receiving a writing request to write a first data to a first storage apparatus; determining a second data from among a series of data and based on a writing sequence of the series of data written to the computer and a count of storage areas at a second storage apparatus that sequentially selects from among the storage areas when data is received, a storage area to be over written by the received data, where the second data is written to the first storage apparatus and is identical to data that is stored in the storage area to be selected next at the second storage apparatus; and transmitting copy data of the first data to the second storage apparatus, when the second data has been written to the first storage apparatus.

Abstract: A replication system includes N (>=3) storage devices and N nodes, connected to a host via a 1st network and connected to the N number of storage devices via a 2nd network, each to receive a request for accessing a storage device associated with itself and to have an access with a content in response to the received access request to the storage device, wherein when a node receives a write request of data from the host, each of M nodes (1<M<N) including the node stores the data in the storage device associated with itself, and if first data in a first storage device cannot be read out, the first data stored in another storage device is stored into a second storage device not stored with the first data by transmitting the first data via the second network.

Abstract: Multiple storage apparatuses are provided, at least part of which are individually incorporated into one of storage groups. Each of multiple control apparatuses is configured to, when assigned one or more of the storage groups each including one or more of the storage apparatuses, control data storage by storing data designating each assigned storage group redundantly in the storage apparatuses of the assigned storage group. An information processing apparatus is configured to, when a storage group with data redundancy being lost is detected, make a change in control apparatus assignment for the storage groups in such a manner that a storage group different from the detected storage group is not assigned to a control apparatus with the detected storage group assigned thereto. Subsequently, the information processing apparatus causes the control apparatus to execute a process of restoring the data redundancy of the detected storage group.

Abstract: A storage system having a plurality of storages. The each of the storages include a memory and a processor coupled to the memory. The processor executes a process including transmitting an update request for data which is commonly stored in the plurality of storages according to a predetermined transmission order indicating a path to transfer the update request. The process includes updating data when receiving an update request from another storage. The process includes changing the predetermined transmission order to a transmission order in which one or more storages included in the path are excluded according to the number of times the update request for the data is received.

Abstract: An information processing system includes: CPUs; storage devices; switches; dummy storage devices which are with respective storage devices and each of which sends, when receiving an identifying information request, its own identifying information back to a sender of the identifying information request; and dummy CPUs which are associated with respective CPUs and each of which tries to, when receiving an instruction for acquiring identifying information from a dummy storage device, acquire the identifying information of the dummy storage device by transmitting the identifying information request, and sends the identifying information as response information back to a sender device of the acquiring instruction.

Abstract: A storage management apparatus manages a plurality of storage apparatuses in a storage system that disperses and stores data that is made redundant so as to have a predetermined redundancy level. The storage management apparatus includes: a patrol process unit that performs, at a patrol speed, a patrol process of confirming that the plurality of storage apparatuses are being operated normally; a relocating process unit that performs, at a relocating process speed, a relocating process of moving the data between the plurality of storage apparatuses; a recovery process unit that performs, at a recovery process speed, a recovery process of recovering the redundancy level of the data when a fault occurs in the plurality of storage apparatuses; and a processing speed control unit that controls the recovery process speed or a sum of the patrol process speed and the relocating process speed to have a predetermined value.

Abstract: 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.

Abstract: An information processing apparatus including plural operation processing apparatuses and plural disk apparatuses, which are connected to each other via a switch. A management apparatus provides, in response to a loan request from a terminal, a first operation resource and a first storage resource of a first processing apparatus in which a first operation processing apparatus and a first disk apparatus are connected with each other through the switch, to the terminal through a network. The management apparatus releases the connection between the first operation processing apparatus and the first disk apparatus through the switch in response to a return request from the terminal and provides the first storage resource and a second operation resource of a second processing apparatus in which a second operation processing apparatus and the first disk apparatus are connected with each other through the switch, to the terminal through the network.

Abstract: 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.

Abstract: A first processor is configured to receive allocation of storage devices and configure a group by involving the allocated storage devices. Each of the allocated storage devices is contained in different storage units. The first processor is configured to detect a failure of a first storage device included in the group. The first storage device is contained in a first storage unit of the different storage units. The first processor is configured to receive allocation of a second storage device from a second storage unit of the different storage units and reconfigure the group by involving the second storage device in place of the first storage device. The first processor is configured to receive allocation of a third storage device from a third storage unit and replicate the second storage device in the third storage device. The third storage unit is not of the different storage units.

Abstract: An access method includes: obtaining, by a computer, a result of monitoring a busy rate and a number of access operations per unit time of a storage device, the storage device having a first storage area and a second storage area; calculating a characteristic of correlation between the busy rate and the number of access operations per unit time based on the result; calculating a second number of access operations per unit time based on the characteristic of the correlation such that a sum of a first busy rate corresponding to a first number of access operations per unit time and a second busy rate corresponding to a second number of access operations per unit time becomes equal to or lower than a given busy rate; and controlling a number of operations to access the second storage area per unit time based on the second number of access operations.

Abstract: An information processing apparatus includes a first storage unit and a processor. The first storage unit includes a first storage area. The processor receives a first request to write first data into the first storage area. The processor requests an external apparatus to write the first data into a second storage area in a second storage unit included in the external apparatus. The processor determines whether a first response has been received from the external apparatus. The first response indicates that the first data has been written into the second storage area. The processor writes the first data into the first storage area when the first response has been received. The processor requests, without writing the first data into the first storage area, the external apparatus to write second data stored in the first storage area into the second storage area when the first response has not been received.

Abstract: A non-transitory computer-readable recording medium stores therein a charge calculating program that causes a computer that manages a database of different data items to execute recording for each data item, information indicating the number of clients that receive the data item; extracting from the information recorded at the recording and for each data item to be received by a given client, information indicating the number of clients receiving the data item; calculating charges for the given client, based on the extracted information; and outputting the calculated charges.