35 results about "Replica management" patented technology

The system and method of the invention provides for function-specific replication of digital data, such as files or objects, with a configurable time delay for each function to be replicated. The system includes a source storage system from which digital data is to be replicated, a destination storage system(s) to which the digital data is being replicated, a replication management module for managing the function specific replication delay and the data replication between the source storage systems and the destination storage system(s).

A replica management system facilitates maintaining a distributed and fault-tolerant state for a variable over an Information Centric Network (ICN) by replicating the variable across a set of ICN nodes. During operation, a variable-hosting ICN node can receive an Interest that includes a value-updating command for a replica instance of the variable, current values for a set of replicas of the variable, and a new value for the variable. The ICN node can determine, based on the current values for the set of replica variables, whether the current value for the local replica variable is an authoritative value. If so, the ICN node updates the local replica variable to the new value. However, if the current local value is not the authoritative value, the ICN node rolls back a state of the local replica variable to a previous state, and updates the local replica variable to the new value.

The invention relates to the field of computer application, and discloses a dynamic replica management method based on file heat. The method comprises a main management server and a memory server cluster, wherein the main management server is used for receiving user file access requests and updating access records of the accessed files, and the memory server cluster comprises a plurality of memory servers used for storing files. The dynamic replica management method comprises the specific steps of a multi-frequency file heat computing mechanism, a multi-queue file heat updating mechanism, and a multi-frequency replica execution mechanism. The dynamic replica management method has the advantages that the problems of contradiction between the file heat statistic period and the heat statistic accuracy, and sudden user access are solved effectively, the system spending is reduced greatly, and higher reliability is provided simultaneously.

Disclosed is a method for data synchronization and update conflict resolution between mobile clients and a server in a mobile system which maintains consistency of data between the clients and the server and enables the clients to continuously perform an effective update operation with respect to objects of the server even in a clients' disconnection state by the mobile clients performing an independent update operation with respect to disjoint fragments and associated objects for a specified object using the structure of the objects and the meaning of applications and then performing the data synchronization and the conflict resolution between the clients and the server during a reconnection operation. The method includes a copy management step of copying data of a server-side DB into a client-side built-in DB and the server managing contents of copying and a copying time, a data synchronization step of synchronizing changed data between the mobile clients and the DB server with respect to a data change produced during the mobile clients' disconnection state in accordance with a request of the mobile clients after a reconnection of the mobile clients, and a conflict detection and resolution step of detecting an error that damages consistency of the data in the data synchronization process and resolving the detected error.

There is provided a distributed data storage system for splitting content-data into a plurality of split data and storing a plurality of copy data corresponding to at least one of the plurality of split data in a plurality of memory devices. The system comprises a copying management information storing unit and a access location determining unit. The copying management information storing unit stores copying management information indicating a storage location of the copy data corresponding to the split data. The access location determining unit determines at least one of the plurality of memory devices storing the copy data corresponding to the split data as an access location for accessing split data.

Disclosed are a method and apparatus for heterogeneous replica management in a distributed storage system. The method comprises: obtaining write request parameters of a replica for storing a file; obtaining from a metadata server the position information of each storage server in the distributed storage system according to the write request parameters; according to the write request parameters, converting the replica of the file into a plurality of heterogeneous replicas of the file in different formats on the basis of pre-designated formats; and storing the plurality of heterogeneous replicas of the file in different formats obtained from conversion, in the designated storage servers respectively according to the position information of the storage servers obtained from the metadata server. With the technical solution discussed above, a file can be used to store a plurality of different heterogeneous replicas respectively in a plurality of storage servers, and in case of reading the heterogeneous replicas of the file, the corresponding heterogeneous replicas can be read as needed, thus the working efficiency of users in data processing can be improved effectively.

An additional data useful for the management of copies of a document for an image forming apparatus is embedded in a hard copy of the document. The additional data is embedded in an inherent image of a document as discrete dots arranged in a prescribed format. Preferably, the size of each of said discrete dots is not so large as to be recognized easily with naked eyes. The additional data can be embedded in unit of blocks. Further, the density of the discrete dots is different from the density adjacent to the discrete dots. The image data for embedding an additional data can be obtained by reading a document, or by receiving data sent from a computer or read from a floppy disk. An additional data embedded in a hard copy can be extracted from the image data on the hard copy. Further, the production of a copy according to the image data can be controlled according to the extracted additional data. For example, if the additional data means that the source of the hard copy is a secret document, the copying is allowed only for a legitimate user. An additional data is generated for each copy according to the extracted additional data for embedding it in a hard copy to identify each copy. The additional data generated for each copy are compiled and they are used to manage copies of various sources systematically and illegal copies can be traced easily. If the additional data received from a printer is not consistent with the additional data already stored, the printing may be prohibited. A transmitter for transmitting an additional data may be provided in a document such as a book.

The invention discloses a data processing method and device for an intelligent measurement terminal based on edge computing, equipment and a computer readable storage medium, and the method comprisesthe steps: configuring an edge computing node server after the integration of functions and features of all layers of the intelligent measurement terminal is completed in advance; after the configuration of the edge computing node server is completed, storing replica data of lower-layer equipment data acquired by the edge computing node server into a plurality of edge computing nodes by utilizinga distributed local replication management method, a partition edge node replica management method and a multi-homing block replica management method; when data interaction is carried out between theedge computing node server and the cloud, adding a data block processing security protection mechanism. According to the method, the device, the equipment and the computer readable storage medium provided by the invention, the problem of network congestion between the edge computing node and the cloud due to access based on a large data set is solved, the operation delay is reduced, and the data block processing capability of the edge computing node is improved.

The invention discloses a replica management method for a distributed file system, which includes steps of: resetting a corresponding replica state on main nodes according to a replica state on block nodes when the block nodes re-register to the main nodes; setting the corresponding replica state as an error state if the replicas on the block nodes are damaged; setting the corresponding replica state as a correct state to be removed if the replicas on the block nodes are to be removed; and setting the corresponding replica states as the correct state if the replicas on the block nodes are normal. The replica management method for the distributed file system is capable of maintaining replica consistency in the distributed file system.

Embodiments of the present invention provide a system and method for handling unit attentions. According to one embodiment of the present invention, a copy manager can receive an extended copy command and can issue a unit attention clearing command, such as the test unit ready command, to the source and destination devices listed in the extended copy command. The copy manager can further issue read commands to the source device and write commands to the destination device to copy data from the source device to the destination device according to the extended copy command.

A system for managing the number of duplicates of digital data even when a variety of recording mediums capable of repeated recording are used. The statement of the values of the number of seconds of the recording time recorded in a UTOC sector 2 of a mini-disc is differentiated between a case of recording using a conventional duplication route duplicating the audio data from a CD block (4) and a case of recording using a new duplication route of duplicating audio data from a hard disc (3) through a host controller (2). The recording time the statement of which is differentiated depending on the routes of duplication or the discrimination information of the audio data is managed by the host controller (2) to perform duplication number management.

System and methods for effecting communications between a trusted management process and one or more managed processes in a distributed computing environment where direct communications between processes via a data communications network is blocked by a firewall or other security system. The method includes a file server that is accessible to all communicating processes. The file server provides a secure mailbox for each managed process. The mailbox is used to hold messages that are stored as individual files. The management and managed processes communicate by writing and reading files in the mailbox of the managed process. The stateless manner of the message-based communications makes it easy to replicate the management process in order to provide scalability and fault-tolerance for the management functions.

The invention provides a semantic prefetching system and a semantic prefetching method for resource cloud storage in the educational field. The system comprises a user interface module, a request control module, a cloud storage module, a buffer management module, a replica management module and a prefetching module. The method comprises the following steps: user requests concept acquisition, concept set topic relevance judgment, candidate center concept selection, center concept determination, prefetch object determination, prefetch storage target node determination, prefetch window size and topic relevance maintenance, conversion, disappearance and stopping prefetching. Aiming at the shortcomings of the cloud storage method in the education field, the invention combines the characteristics of the education resources to form a specific education cloud storage system.

The present invention discloses a cloud storage system suitable for the access of a mobile device. The cloud storage system is divided into two layers: a mobile node group layer - a storage node layer, wherein a mobile node group provides a function of a cache layer. The system employs a complete ectypal mode, provides high-performance data storage services for the mobile device while guaranteeing the reliability of data. The system employs a dynamic replica management algorithm of a curve fitting heat value for managing the duplicate in the mobile node group, and mobile equipment transmits a data access request to the nearest mobile node group. A group leader selects a free mobile node in the group and performs a data service according to the type of a mobile client access request. If the data, to which the mobile client needs to access, is not in the nearest node group, the mobile node replaces the mobile device to access a storage node. The method of the invention can reduce the pressure of the mobile client in processing the data, improves the access speed while reducing the power consumption of the mobile client, reduces the redundant data in the system, and saves the storage space.

The invention provides an optimization method for state machine replica management model. In the method, when a large queue is blocked, the blocked queue will notify other large queues and indicate that corresponding small queues will be empty soon and commands of other large queues can be used; and the large queues which receive the message will change mapping functions which are distributed secondarily if the large queues have not met a command requiring synchronization, will distribute a part of the commands in the queues to the blocked idle small queues and will distribute a part of the commands to the corresponding small queues of the large queues. When a synchronization command is processed, distribution schemes of each large queue will be recovered, and space of other queues will not be occupied. In this way, the system concurrence degree will not be reduced even if the commands distributed to each large queue are unbalanced and the synchronization commands of some queues come early and get blocked for the reason; system resources can be fully applied; and the throughput capacity will not be greatly reduced with increase of the synchronization command quantity.

A replica management system facilitates maintaining a distributed and fault-tolerant state for a variable over an Information Centric Network (ICN) by replicating the variable across a set of ICN nodes. During operation, a variable-hosting ICN node can receive an Interest that includes a value-updating command for a replica instance of the variable, current values for a set of replicas of the variable, and a new value for the variable. The ICN node can determine, based on the current values for the set of replica variables, whether the current value for the local replica variable is an authoritative value. If so, the ICN node updates the local replica variable to the new value. However, if the current local value is not the authoritative value, the ICN node rolls back a state of the local replica variable to a previous state, and updates the local replica variable to the new value.

The CDN-based replica maintenance method is applied to a replica management server communicating with a plurality of replica storage nodes, and comprises the following steps: receiving heartbeat information of the plurality of replica storage nodes, the heartbeat information comprising battery state information of each replica storage node; identifying the states of the plurality of replica storage nodes according to the battery state information, wherein the states comprise an on-line state and an off-line state; acquiring replica information of the replica storage node in an offline state; selecting one or more replica storage nodes in an online state; and copying the corresponding copy to the selected copy storage node according to the obtained copy information needing to be copied. Theinvention also discloses a server, a replica storage node and a system. According to the method, the heartbeat information of the replica storage node is regularly received, the stability of the nodestoring the replica is monitored, the replica data of the offline replica storage node is maintained, the loss of the data replica is avoided, and an effective maintenance method is provided for replica data storage of the CDN.

A digital information copy management device includes: a data storage unit, which is configured to store data; a data processing unit, which controls writing data to the data storage unit, and reading data from the data storage unit; a bus , which connects the data storage unit and the data processing unit to transmit data having a plurality of bits in parallel; and a logic circuit unit, which is arranged between the data storage unit and the data processing unit, and It inverts at least one bit of data transmitted in parallel within the bus.

The invention discloses a copy management method, and the method comprises the steps: determining a data copy in a file system, and setting the currently accessed data copy as a reading source copy; setting the data copies except the reading source copy as target data copies; if a copy management instruction is received, copying the target data copy to a host corresponding to the copy management instruction, wherein the copy management instruction comprises a copy reconstruction instruction, a copy synchronization instruction or a load balancing instruction. According to the invention, the replica management efficiency can be improved, and the influence of replica management operation on execution of normal services is reduced. The invention further discloses a copy management device, a storage medium and electronic equipment, which have the above beneficial effects.

A reproducing method for a record medium, the reproducing method comprising the steps of performing a demodulating process for data that has been read from a record medium on which data of a content has been recorded, at least management information and additional information being embedded to the data of the content, the management information being with respect to a copy management, the additional information containing at least one of error detection code and error correction code added to the management information, detecting the additional information from an output signal of which the demodulation process has been performed, performing an error detecting process corresponding to one of the error detection code and the error correction code of the detected additional information, and controlling an output operation for an output signal of which the demodulating process has been performed for the data of the content that has been read from the record medium corresponding to the management information when no error takes place in the error detecting process.

The invention discloses a replica management method for a distributed file system, which includes steps of: resetting a corresponding replica state on main nodes according to a replica state on block nodes when the block nodes re-register to the main nodes; setting the corresponding replica state as an error state if the replicas on the block nodes are damaged; setting the corresponding replica state as a correct state to be removed if the replicas on the block nodes are to be removed; and setting the corresponding replica states as the correct state if the replicas on the block nodes are normal. The replica management method for the distributed file system is capable of maintaining replica consistency in the distributed file system.

Disclosed is an asynchronous copying of a data within memory. An example method includes during execution of a software application by a processor, receiving, by a copy processor separate from the processor, a request for an asynchronous data copy operation to copy data within a memory accessible by the copy processor, wherein the request is received from a copy manager accessible by the software application in a user space of an operating system managing execution of the software application; in response to the request, initiating, by the copy processor, the asynchronous data copy operation; continuing execution of the software application by the processor; determining, by the copy processor, that the asynchronous data copy operation has completed; and in response to determining that the asynchronous copy operation has completed, selectively notifying, by the copy processor, the software application that the asynchronous copy operation has completed.

An information processing apparatus and method capable of minimizing influences affecting business activities and dynamically changing the configuration of a storage apparatus in response to scale-out of hosts are proposed. The information processing apparatus for managing the configuration of the storage apparatus which constitutes a hybrid cloud system is provided with a data acquisition unit and a data copy management unit; and if the data acquisition unit detects the scale-out of the hosts and determines that a first volume, which stores data from the hosts, in the storage apparatus has a high load, the data acquisition unit issues an instruction to the data copy management unit to copy the data and the data copy management unit issues an instruction to the storage apparatus, in accordance with the instruction from the data acquisition unit, to copy the data, regarding which the access frequency from each host is high, to a second volume and to copy the data, regarding which the access frequency from a specified host is high, to a third volume.

When the management area and the actual data area are separated beforehand in a filesystem and the management area is replicated to perform backup, the maximum number of files to be managed will be limited by the size of the management area because it is necessary to reserve the management area and the backup management area beforehand. In a filesystem in which the management area and the data area are recorded into a common area, it is impossible to use a replicating technique of the entire management area since there is no concept of the management area. The problem is solved by creating in succession history information of a file each time an action such as addition, revision or deletion of the file on the recording medium is effected, each history information including recorded positional information of the file on the recording medium and the type of the action on the file, related with the file identification information of the file; and recording the history information in a history table area, which is separated from the area where the files and management information are recorded, in the order in which the history information have been created.

Disclosed is an asynchronous copying of a data within memory. An example method includes during execution of a software application by a processor, receiving, by a copy processor separate from the processor, a request for an asynchronous data copy operation to copy data within a memory accessible by the copy processor, wherein the request is received from a copy manager accessible by the softwareapplication in a user space of an operating system managing execution of the software application; in response to the request, initiating, by the copy processor, the asynchronous data copy operation;continuing execution of the software application by the processor; determining, by the copy processor, that the asynchronous data copy operation has completed; and in response to determining that theasynchronous copy operation has completed, selectively notifying, by the copy processor, the software application that the asynchronous copy operation has completed.