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).

Peer-to-peer file sharing is increasing in popularity on the Internet, faster than any product known in history. Although file-sharing can enable massive piracy, it has many advantages for distribution of information including scalability. Alternatively, file-sharing can be sabotaged with falsified files and used to distribute viruses. To this end, a solution that maintains the scalability of file-sharing and promotes reliability is proposed. The solution involves embedding data within the file or content and using the data to identify the content, demonstrate its completeness and lack of viruses, and verify the file can be shared. The embedded data can be checked when the file is registered with the database for sharing, and before or while the file is being uploaded and / or downloaded. Ideally, the embedded data is added at the time of creation for the file. The embedded data may include a watermark and be linked to other copy management systems, such as those proposed in DVD and SDMI. Finally, the embedded data can be used to enable purchases of files that owners do not have rights to share.

A copy management switch is placed in a network that connects a storage device with a computer. This copy management switch is connected to the computer, a first storage device, and a second storage device over the network. The copy management switch copies beforehand data stored in the first storage device to the second storage device. On receiving a read request, which is issued from the computer to the first storage device, the copy management switch converts the read request to the first storage device into a read request to the second storage device, and then transmits the converted read request to the second storage device. The second storage device transfers, to the copy management switch, data corresponding to the read request. The copy management switch transfers the data to the computer as data transferred from the first storage device.

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.

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.

A technique for restoring data after suspension of a communications link between two storage systems is disclosed. Upon suspension of the link, an image of the data at the first and second locations is created in a secure location. While the link is down, updates to the data at each of the first and second locations are maintained separately. Upon reestablishment of a communications link, the two locations are again synchronized.

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.

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.

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.

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.

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.

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.

Asynchronously copying data within memory is disclosed. An example method comprising, 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 in a copying data in memory, wherein the request is received from a copy manager accessible by the software application in user space of an operating system that manages execution of the software application; in response to the 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 operating system has completed; and in response to determining that the The asynchronous copy operation has been completed, and the copy processor selectively notifies the software application that the asynchronous copy operation has been completed.

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.