33results about How to "Achieve data recovery" patented technology

A method for recovering flash data in the event of power-off in an embedded Linux system solves the problem that sudden power-off at the time of read and write data flashing causes the defects of data loss or file system damage. The invention adopts the technical scheme as follows: defining and dividing a root file system in the flash memory into a fixation area, a modification area and a backup area; giving deferent loading manners to the subareas through a system file JFFS2; distributing configuration information in the root file system to the catalogues in the fixation area; and storing the temporary file produced during the system operation in the root file system in the memory. When data loss is caused by accidental power-off of the file system, the Linux system transfers the file system in spare subarea to carry out recovery of default setting and judges whether the current file system is damaged or not; whether to continuously conduct file loading to the file system is decided according to the detection to the system file with important parameters of system setting. The invention has the beneficial effects that the data recovery to the flash in the event of power-off is realized, and data loss in flashing process is avoided.

The invention provides a method and device for maintaining data of a drive circuit. The drive circuit comprises a source memory for storing original data. The method comprises the following steps: duplicating the original data in the source memory to at least one backup memory; generating check codes corresponding to the original data in the source memory; periodically reading the data in the source memory and the data the backup memories and checking the data respectively with the check codes to verify whether the data in the source memory and the data in the backup memories change; and whenthe data stored in the source memory changes, duplicating the unchanged data stored in the backup memories to the corresponding positions of the source memory, and when the data stored in the backup memories change, duplicating the unchanged data stored in the source memory to the corresponding positions of the backup memories. According to the technical scheme adopted by the invention, the problem that destroying of the information in the memories caused by ESD (electrostatic discharge) leads to failure of the circuit to work normally can be effectively solved.

The invention relates to the technical field of information security, and in particular relates to a method for realizing a security electronic mail based on a digital envelope. According to the invention, on the basis of the digital envelope technology based on PKI symmetric and asymmetric key algorithms, mail encryption and decryption information, user key information, data recovery information, mail ciphertext and other information are assembled into the digital envelope; and thus, encryption, decryption and data recovery of the electronic mail are realized. According to the invention, a session key is encrypted by obtaining all public key certificates of each receiver from a LDAP, such that interconnection and intercommunication of multiple certificates of one person are realized; when a mail blind copying function is started, mail information can be decrypted only by the private key of a blind copying user; therefore, the identity confidentiality of the blind copying user is ensured; in an emergency case that the private key of the user is lost or damaged, mail information can be decrypted without recovering the private key of the user through a KMC; and, by means of a high-grade security protection mechanism that the encrypted private key cannot be derived and a strict service approval signature mechanism, the security of recovered information is ensured from the perspectives of technologies and management.

The invention discloses a Storm based stream computing frame text index method and system. The Storm based stream computing frame text index method includes: implementing topology of a storm, designing a Storm real-time data processing frame, and completing a webpage automatic extraction program of a web spider; automatically extracting key words; and classifying texts: classifying texts into one or more classifications according to content or attributes of the texts. The method and the system can allow backup data back in the conditions of data corruption or data loss, and recovers data; the function of centralized operation and maintenance of the system can be provided; an interface is beautiful and practical, and a convenient and visual graphical user management interface is achieved; function expansion can meet the demands of a user for later system expansion and use range expansion; and fault tolerance allows the system to have a certain fault tolerance mechanism when illegal data generates due to user input or wrong operations.

A piece of backup area divided from flash area of mobile terminal is in use for storing user data exclusively. The flash backup area is divided into three parts: number area, cipher area and data area. After a communication terminal device of using the said configuration is lost, owner informs operational manager to broadcast message through group transmission. Received the said message, all mobile terminals carry out encryption process for marked number in message, and compares it with flash mark number in this terminal. If the said numbers are identical, then backup data in flash is read out automatically. According to some format, operational manager forwards the backup data to the mobile terminal the user applies for. The invention realizes automatic recovery function of user data so as to prevent expanding loss further.

The invention discloses an application method for accurately obtaining LLR information. The method is characterized by comprising the steps of selecting statistics samples; calculating Optimal Vref of each sample; by setting multi-level multi-bit reading voltages, calculating the LLR information corresponding to the multi-level reading voltages, and performing multi-bit LDPC decoding; and by comparing iterative frequencies and decoding results of the multi-bit LDPC decoding corresponding to different reading voltages, recording the reading voltage with the lowest iterative frequency and the decoding correctness as a multi-bit optimal reading voltage, wherein the corresponding LLR information is initial LLR information of a batch of products, and the batch of the products finitely adopt the optimal reading voltage to read data by default and adopt the initial LLR information to decode the data. An empirical value is obtained by adding statistics and serves as a parameter during normal decoding to ensure normal NAND reading-writing efficiency; and when the normal decoding fails and data recovery needs to be carried out, the scheme can estimate more accurate multi-bit LLR information, thereby reducing the error code rate and realizing the data recovery.

The invention relates to a heterogeneous database unified disaster recovery backup method and device based on virtualization and snapshot, and the method comprises the following steps: constructing a virtual machine matched with a source end hardware environment by using a virtualization technology, maintaining a standby database in the virtual machine, and keeping the standby database in data synchronization with a source database of a source end and in operation; carrying out primary full-amount backup; monitoring whether a source end generates a new log event or not in real time, and if yes, backing up the new log event and controlling the virtual machine to perform log synchronization at the same time; whether a snapshot instruction is generated or not is monitored in real time, and if yes, a data snapshot of a storage volume corresponding to a standby library in the virtual machine is obtained, and a virtual snapshot library is generated; and when recovery is executed, realizing data recovery based on the virtual snapshot library. Compared with the prior art, the method has the advantages that the reliability and the data security of a database system can be ensured, and meanwhile, physical resources are flexibly distributed and scheduled according to needs.

The invention discloses a data processing system and a data processing method. The data processing system comprises a distributed object storage subsystem, a first host machine comprising a first container, and a second container. During cross-container data recovery, the first host machine converts a container end recovery request which is initiated by the first container and aims at a target file under a container end file path of the second container into an object downloading request comprising an access key of the same data barrel; and the distributed object storage subsystem reads an object corresponding to the target file in the same data bucket according to the object downloading request after the access key verification is passed, and sends the read object to the first host machine, and the first host machine then converts the object into a file and maps the file to the first container. According to the invention, the first container and the second container are different containers and are respectively loaded with container end file paths of the same data barrel, cross-container data recovery can be effectively realized.

The invention relates to an electronic recording device providing the power-fail data protection, which comprises an interface which exchanges data with an external device, a controller connected with the interface, a storage module connected with the controller, and a microprocessor connected with the controller, and further comprises a data recovery module connected with the microprocessor, and a detecting module which is connected with the microprocessor and is used for detecting data conditions. Since using the technical proposal, the data before the power-fail can be recovered and stored under the condition that an electronic recording device is power-failed, which guarantees the safety of data and satisfies the requirements of optimum data storage under the condition of power-fail.

The invention provides a server capable of achieving network abnormity repair and a network abnormity repair method of the server. The server comprises a webpage interaction device, a user management device, a data processing device and an abnormity monitoring processing unit, wherein the webpage interaction device is used for processing operations between a user and a server system, the user management device is used for managing the login permission of the user, the data processing device is used for processing data accessed by the user, and the abnormity monitoring processing unit is used for monitoring the conditions of devices in the server in real time. According to the server and the network abnormity repair method of the server, concrete analysis can be carried out according to the specific conditions of an abnormity, a complete computer is prevented from being restarted, and the recovery time after the device abnormity is shortened.

The embodiment of the invention provides a data sending control method and device, a terminal, a base station and a medium. The method comprises the steps of a PDCP sending end obtaining PDCP state report information sent by a PDCP receiving end; and if the parameter in the PDCP state report information fails to be matched with the current sending state of the PDCP sending end, correcting an encryption parameter of a subsequent PDCP PDU data packet to be sent or to be retransmitted by the sending end according to the parameter in the PDCP state report information so as to obtain the corrected encryption parameter. According to the scheme, the encryption parameter of the subsequent PDCP PDU data packet to be sent or to be resent at the sending end is corrected according to the parameter in the PDCP state report information, so that data recovery is realized.

The invention provides a data processing method and device, and the method comprises the steps: obtaining a deletion type of a deletion request when the deletion request of a cloud hard disk is received; if the deletion type is soft deletion, setting a logic value of a soft deletion mark corresponding to the cloud hard disk in a database to be true, and keeping the logic value of an original deletion mark corresponding to the cloud hard disk unchanged as a default value; and, when the logic value of the soft deletion mark corresponding to the cloud hard disk in the database is set to be true and the logic value of the original deletion mark corresponding to the cloud hard disk is false, performing soft deletion operation on the cloud hard disk, wherein the default value of the logic valueof the original deletion mark corresponding to the cloud hard disk is false. Violent deletion is not performed on the data, so that subsequent data recovery can be realized.