Abstract: A method begins with a processing module initiating a rebuilding process for an encoded data slice of a set of encoded data slices and generating rebuilding information from one or more other encoded data slices of the set of encoded data slices. The method continues with the processing module creating a rebuilt encoded data slice for the encoded data slice based on the rebuilding information. The method continues with the processing module determining whether another encoded data slice of the set of encoded data slices requires rebuilding and when the other encoded data slice requires rebuilding, the method continues with the processing module creating another rebuilt encoded data slice for the other encoded data slice based on the rebuilding information without initiating another rebuilding process for the other encoded data slice.

Abstract: A set of data structures are stored in a distributed shared memory (DSM) component and in persistent storage. The DSM component is organized as a matrix of page. The data structure of the set of data structures occupies a column in the matrix of pages. A recovery file is maintained in the persistent storage. The recovery file consists of entries and each one of the entries corresponds to a column in the matrix of pages by a location of each one of the entries.

Abstract: A data handling system includes a compressive sensing unit that receives a source date file. A sparseness module compressive sensing unit generates a sparse source data file by inducing sparseness into the source data file. A measurement module within the compressive sensing unit generates a compressed sensed source data file from the sparse source data file and based on a sensing matrix. The compressed sensed source data file is to be transmitted to a remote data storage facility for storage. A recovery unit generates the source data file from the compressed sensed source data file retrieved from the remote data storage facility and based upon the sensing matrix.

Abstract: Storing data includes encoding the data using an erasure encoding to provide encoded data, separating the encoded data into a number of components, and providing each of the components to separate data sites. The data may be encoded using a Reed/Solomon encoding. The data may be encoded using a 3-1 Reed/Solomon encoding and the encoded data may be separated into four components that are provided to four separate sites. The data may be encoded by a site that receives the data prior to encoding. The data may be encoded by a client that provides the data to a plurality of sites coupled thereto. Storing data may also include each of the separate data sites providing an additional encoding for the components. The data and the components may be encoded using a Reed/Solomon encoding.

Abstract: A data processing system includes a first storage system that is connected to a host device and sends and receives data to and from the host device; a second storage system that is connected to the first storage system and receives data from the first storage system; and a third storage system that is connected to the first storage system and receives data from the first storage system. The first storage system, the second storage system and the third storage system are arranged to be changeable between a first status including first and second copy pairs and a second status including a third copy pair in response to a predetermined condition at the first storage system.

Abstract: A distributed system for creating a checkpoint for a plurality of processes running on the distributed system. The distributed system includes a plurality of compute nodes with an operating system executing on each compute node. A checkpoint library resides at the user level on each of the compute nodes, and the checkpoint library is transparent to the operating system residing on the same compute node and to the other compute nodes. Each checkpoint library uses a windowed messaging logging protocol for checkpointing of the distributed system. Processes participating in a distributed computation on the distributed system may be migrated from one compute node to another compute node in the distributed system by re-mapping of hardware addresses using the checkpoint library.

Abstract: An apparatus and a method for fault recovery are provided. The fault recovery apparatus includes a log manager configured to record system resource allocation information about a thread. The fault recovery apparatus further includes a recovery manager configured to create a recovery thread that substitutes for a target thread where a fault has occurred. The fault recovery apparatus further includes a resource manager configured to map a system resource that the target thread has used to the recovery thread based on referencing to the system resource allocation information.

Abstract: A system and method for restoring a signal test apparatus to a previous state receives a time interval set by a user to create restore point files. The signal test apparatus tests signals of a test object and creates a restore point file according to the time interval. The restore point file stores signal test data of a test object when the restore point file is created. If the signal test apparatus needs to be restored to a previous state, the signal test data of a latest restore point file are acquired. The acquired signal test data are displayed on a display of the signal test apparatus.

Abstract: Techniques for the design and use of a digital signal processor, including (but not limited to) for processing transmissions in a communications (e.g., CDMA) system. Inter-thread trace alignment with execution trace processing includes recording timing data relating to a common predetermined event. Such an event may be the number of cycles since a last thread initiated execution tracing or the number of cycles since all threads terminated execution tracing. The number of cycles at which a thread initiates execution tracing is referenced to the common predetermined event for maintaining the timing of execution tracing. The data relating to the common predetermined event is then updated to associate with the time at which the thread initiated execution tracing. The result is to permit aligning the timing data associated with all threads.

Abstract: Provided are a home/building fault analysis system and method using a resource connection map log which compares and analyzes a previous integrated resource state and a current resource state using resource connection map logging information based on a standard resource management model when a fault is generated, provides state information of the resource in which information having high association with a fault resource is mainly changed, and performs an effective fault analysis and process by restoring to the previous resource state, as necessary. According to the prevent invention, when the fault is generated, a synthetic state of resources within a home/building as well as a state of an individual resource may be known from the resource connection map.

Abstract: The present invention concerns a file repair method for recovering a file, in a system for distributing content to more than one receiver, comprising, at a first receiver, the steps of receiving a set of files in a push multicast from a transmitter, receiving an identifier of a second receiver that owns a missing file that is not comprised in the received set of file; and recovering the missing file from the second receiver in a pull mode using a peer-to-peer mechanism. Another object of the invention is a method for file recovery in a server and in a peer device.

Abstract: An apparatus and a method for Automatic Repeat reQuest (ARQ) feedback in a wireless communication system are provided. A method for the ARQ feedback at a receiving end includes when receiving an ARQ block from the transmitting end, checking for error in the ARQ block, when the ARQ block has no error, initializing and driving a timer used for determining whether to perform the ARQ feedback according to reception of a next ARQ block, when receiving the next ARQ block without error before the timer expires, initializing and driving the timer, and when the timer expires, performing the ARQ feedback in relation to at least one ARQ block received without error.

Abstract: A storage apparatus includes a backup processing unit that stores data stored in a first memory into a second memory as backup data upon occurrence of a power failure, a restore processing unit that upon recovery from the power failure restores the backup data backed up in the second memory to the first memory and erases the backup data, and an erasure processing termination unit that terminates the erasure processing upon a power failure occurring during erasure processing for erasing the backup data stored in the second memory, and a re-backup processing unit that re-backs up data in the first memory corresponding to the backup data erased from the second memory before the erasure processing is terminated by the erasure processing termination unit to a location in the second memory subsequent to a last location that contains the backup data which has not been erased.

Abstract: Embodiments of the present invention relate to detecting and rectifying corruption in a distributed clock in a distributed system. Aspects may include receiving a sequence number used as part of the distributed clock at a node and determining if the sequence number is corrupt. In order to provide an effective mechanism for determining a sequence number is corrupt and taking corrective actions, a valid sequence number range may be determined, a propagation count associated with the sequence number may be evaluated, an estimated sequence number may be calculated, and an epoch number associated with the sequence number may be evaluated. Additionally, in exemplary aspects node with a corrupt trusted sequence values may self diagnosis and terminate associated processes to prevent further propagation of the corrupt sequence number.

Abstract: A computer-implemented method, a computer-readable medium and a system are provided. A transaction master for each of a plurality of transactions of a database is provided. Each transaction master is configured to communicate with at least one transaction slave to manage execution of a transaction in the plurality of transactions. Each transaction master configured to perform generating a transaction token to specify data to be visible for a transaction on the database, the transaction token including a transaction identifier for identifying whether the transaction is a committed transaction or an uncommitted transaction, receiving a request to commit the transaction, initiating, based on the request, a two-phase commit operation to commit the transaction.

Abstract: A method of testing a processing includes performing a test of at least one logic block of a processor of a data processing system; receiving an interrupt; stopping the performing the test for the processor to respond to the interrupt, wherein the stopping the performing the test includes storing test data of the test to a memory prior to the processor responding to the interrupt; and after the processor responds to the interrupt, resuming performing the test, wherein the resuming performing the test includes retrieving the test data from the memory and using the retrieved test data for the resuming performing the test.

Abstract: Described embodiments provide for recovering an error, which has occurred in video contents, by using hidden data. A video content providing server generates video contents, into which information for video error recovery is inserted. The server includes: a block segmentation unit that segments an original image into at least one block having a pre-set size; a block description information (BDI) generation unit that generates block description information (BDI) for each of the at least one block, each BDI including information necessary to recover each of the segmented blocks; a BDI insertion unit that inserts each of the generated BDI into a block that is different from a block to be recovered by using the generated BDI; and a provisional video generation unit that generates provision video contents by combining at least one block, into which the BDI has been inserted.

Abstract: A compression system identifies one or more fields in a log file based on at least one field rule from among multiple field rules specified in a log file framework. The compression system extracts contents of the log file associated with the one or more fields. The compression system passes the contents associated with the one or more fields to corresponding compression engines from among a multiple compression engines each specified for performing a separate type of compression from among multiple types of compression for each of the one or more fields, wherein each of the one or more fields corresponds to one or more compression engines from among the multiple compression engines.

Abstract: A method of handling a message in a messaging system is provided. The messaging system comprises a message source, a message receiver and a message service. The message service is intermediate of the message source and message receiver, wherein a compensation component is established at the message source.

Abstract: A technique enables creation and use of a writable, read-only snapshot of an active file system operating on a storage system, such as a multi-protocol storage appliance. The writable, read-only snapshot comprises a read-only “image” (file) residing in a snapshot and a writable virtual disk (vdisk) residing in the active file system. The writable vdisk is a “shadow” image of the snapshot file image and, as such, includes an attribute that specifies the snapshot file as a backing store.

Abstract: Techniques to manage recovery and resynchronization of components or modules in a mobile computing device are described. For example, a mobile computing device may comprise a processor and a plurality of hierarchical or peer related modules. The plurality of modules may include resynchronization logic operative to resynchronize a module after a crash using a neighboring hierarchical or peer related module. Other embodiments are described and claimed.

Abstract: A set of log entries is automatically inspected to determine a bug. A training set is utilized to determine clustering of log identifications. Log entries are examined in real-time or retroactively and matched to clusters. Timeframe may also be matched to a cluster based on log entries associated with the timeframe. Error indications may be outputted to a user of the system in respect to a log entry or a timeframe.

Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.

Abstract: A data management system (“DMS”) provides an automated, continuous, real-time, substantially no downtime data protection service to one or more data sources. A host driver embedded in an application server captures real-time data transactions, preferably in the form of an event journal. The driver functions to translate traditional file/database/block I/O and the like into a continuous, application-aware, output data stream. The host driver includes an event processor that can perform a recovery operation to an entire data source or a subset of the data source using former point-in-time data in the DMS. The recovery operation may have two phases. First, the structure of the host data in primary storage is recovered to the intended recovering point-in-time. Thereafter, the actual data itself is recovered. The event processor enables such data recovery in an on-demand manner, by allowing recovery to happen simultaneously while an application accesses and updates the recovering data.

Abstract: Techniques used in an automatic failover configuration having a primary database system, a standby database system, and an observer. In the automatic failover configuration, the primary database system remains available even in the absence of both the standby and the observer as long as the standby and the observer become absent sequentially. The failover configuration may use asynchronous transfer modes to transfer redo to the standby and permits automatic failover only when the observer is present and the failover will not result in data loss due to the asynchronous transfer mode beyond a specified maximum. The database systems and the observer have copies of failover configuration state and the techniques include techniques for propagating the most recent version of the state among the databases and the observer and techniques for using carefully-ordered writes to ensure that state changes are propagated in a fashion which prevents divergence.

Abstract: A method and apparatus to restore a system using virtualization, the method including: if a system restoration at a target restoration time point from among at least one restoration time points is requested, generating a virtualization layer; if a use of a system is requested by an application layer, accessing the target restoration time point using the virtualization layer; and performing a system restoration at the accessed target restoration time point.

Abstract: A system and method for scheduling software updates on data processing systems. In an embodiment, software updates are scheduled on a data processing system by identifying a list of software updates; scheduling at least one primary software update for execution within a scheduled outage time based on an estimated execution time and an estimated rollback time for the at least one primary software update; executing the at least one primary software update during the scheduled outage time; and ordering the list of software updates for possible execution of at least one secondary software update in any remaining outage time in dependence upon the estimated execution times and estimated rollback times for each of the remaining software updates. The list of software updates may also be ordered in further dependence upon evaluation of relative priorities between the software updates, any prerequisite software updates, and a performance scaling factor for the data processing system.

Abstract: A triple parity (TP) technique reduces overhead of computing diagonal and anti-diagonal parity for a storage array adapted to enable efficient recovery from the concurrent failure of three storage devices in the array. The diagonal parity is computed along diagonal parity sets that collectively span all data disks and a row parity disk of the array. The parity for all of the diagonal parity sets except one is stored on the diagonal parity disk. Similarly, the anti-diagonal parity is computed along anti-diagonal parity sets that collectively span all data disks and a row parity disk of the array. The parity for all of the anti-diagonal parity sets except one is stored on the anti-diagonal parity disk. The TP technique provides a uniform stripe depth and an optimal amount of parity information.

Abstract: A method, apparatus and system for data disaster tolerance are provided in embodiments of this disclosure, the method comprising: receiving node failure information from a node; detecting along a predecessor direction and a successor direction of a failure node indicated in the node failure information according to a pre-stored node sequence to determine a first effective predecessor node and a first effective successor node, and all failure nodes between the first effective predecessor node and the first effective successor node; instructing those of all effective nodes that have local content registration index stored on the failure nodes and the first effective successor node to perform a primary index recovery process, respectively, so as to recover primary indexes of all of the failure nodes into the primary index of the first effective successor node.

Abstract: The local storage performs remote copy to the remote storage. For low traffic failback remote copy, the remote storage performs a delta copy to the local storage, the delta being the difference between the remote storage and local storage. The local storage backs up snapshot data. The remote storage resolves the difference of the snapshot of the local storage and the remote storage. The difference resolution method can take one of several approaches. First, the system informs the timing of snapshot of the local storage to the remote storage and records the accessed area of the data. Second, the system informs the timing of snapshot of the local storage to the remote storage, and the remote storage makes a snapshot and compares the snapshot and remote copied data. Third, the system compares the local data and remote copy data with hashed data.

Abstract: A maintenance free storage container includes a plurality of storage servers, wherein the maintenance free storage container allows for multiple storage servers of the plurality of storage servers to be in a failure mode without replacement. The maintenance free storage container further includes a container controller operable to manage failure mode information of the plurality of storage servers, manage mapping of a plurality of virtual storage servers to at least some of the plurality of storage servers based on the failure mode information, communicate storage server access requests with a device external to the maintenance free storage container using addressing of the plurality of virtual storage servers, and communicate the storage server access requests within the maintenance free storage container using addressing of the plurality of storage servers.

Abstract: A method and apparatus is described for parallel debugging on the data nodes of a parallel computer system. A data template associated with the debugger can be used as a reference to the common data on the nodes. The application or data contained on the compute nodes diverges from the data template at the service node during the course of program execution, so that pieces of the data are different at each of the nodes at some time of interest. For debugging, the compute nodes search their own memory image for checksum matches with the template and produces new data blocks with checksums that didn't exist in the data template, and a template of references to the original data blocks in the template. Examples herein include an application of the rsync protocol, compression and network broadcast to improve debugging in a massively parallel computer environment.

Abstract: A base table temporal row affected by a transaction is timestamped. The temporal row has a row ID. The temporal row in the base table is modified according to the transaction. The row ID for the modified temporal row is associated with an identifier for the transaction in a temporal work table. Upon committing the transaction: the temporal work table is searched to determine the row ID of the temporal row modified by the transaction, and a commit-time is saved into the temporal row identified by the row ID.

Abstract: Embodiments of the present invention are directed to computer-management tools and utilities that allow computer users to save and restore current application-level runtime states of computational environments created by users on computer systems. Certain embodiments of the present invention are particularly directed to time-and-memory efficient state-saving and state-restoring tools and utilities that allow a user to save snapshots of the user's application-level runtime environment, to manage and review stored snapshots, and to subsequently restore the application-level runtime state of a computer system from a previously saved snapshot.

Abstract: Technologies are described herein for providing assisted asynchronous replication between a first storage server having a first current state and a second storage server having a second current state. An instruction to roll back a first storage server from the first current state to a previous state according to a previous snapshot is received. The first storage server is then rolled back from the first current state to the previous state according to the previous snapshot. A determination is made as to whether the previous snapshot is available on a second storage server. Assistance data is then retrieved. A last consistency point common to the first storage server and the second storage server based on the assistance data is identified, where the last consistency point is at or prior to the previous snapshot. The second storage server is rolled back from the second current state to the last consistency point.

Abstract: Mechanisms are provided for use with a microprocessor chip, for storing selected reliability information in an on-chip non-volatile storage device. An on-chip reliability controller coupled to one or more on-chip resources of the microprocessor chip, collects raw reliability information from the one or more on-chip resources of the microprocessor chip. The on-chip reliability controller analyzes the raw reliability information to identify selected reliability information for the one or more resources of the microprocessor chip. The on-chip reliability controller stores the selected reliability information in the on-chip non-volatile storage device. The on-chip non-volatile storage device stores the selected reliability information even in the event of an overall failure of the microprocessor chip in which the microprocessor chip loses power.

Abstract: A computer for the stream data processing system includes a query recovery point management table. A recovery point management section determines a recovery point for the stream data processing system by identifying an oldest one of input tuples used for generating output tuples, which are managed, or an earlier tuple through the use of a query recovery point stored in the query recovery point management table, and transmits the determined recovery point for the stream data processing system to an additional computer. The additional computer stores the last-received recovery point for the stream data processing system in a checkpoint file. When the computer for the stream data processing system recovers from a fault, the additional computer transmits the data succeeding the stored recovery point to the computer for the stream data processing system.

Abstract: A method for of accelerating database log hardening using specific per block data protection and damage control is provided. A per write specification is implemented to determine when database log data is mirrored synchronously or asynchronously. Synchronous mirroring is performed upon reaching a predetermined threshold, based on one or more parameters such as transaction value, both individual and cumulative, and the quantity of data written since the last synchronous mirroring. As data is added to the database log, it is written specifying asynchronous mirroring to the primary log file. Once a threshold is met, a write specifying synchronous mirroring is performed to both the primary and secondary log files, thereby hardening the log file in both primary and secondary storage subsystem.

Abstract: A computer system including a first storage system connected to a first host computer, a second storage system connected to a second host computer and a third storage system connected to the first and second storage systems. The second storage system sets transfer setting before an occurrence of a failure, the transfer setting being provided with a dedicated storage area to be used for transferring data to the third storage system by asynchronous copy in response to a failure at the first host computer. Before the start of data transfer between the second storage system and third storage system to be executed after an occurrence of the failure, the second storage system checks the dedicated storage area, data transfer line and transfer setting information, and if an abnormal state is detected, this abnormal state is reported to the host computer as information attached to the transfer setting.

Abstract: A management apparatus to manage log information related to a process in a first information processing apparatus and a second information processing apparatus operating in cooperation with each other. The management apparatus includes a reception unit to receive first log information associated with a first user managed by the first information processing apparatus and to receive second log information associated with a second user managed by the second information processing apparatus from the first and second information processing apparatuses, respectively, which independently perform user management. The management apparatus also includes a log management unit to manage third log information. If the first user corresponds to the second user, then the third log information is generated by merging the first log information associated with the first user and the second log information.

Abstract: A method and system for redundancy management is provided for a distributed and recoverable digital control system. The method uses unique redundancy management techniques to achieve recovery and restoration of redundant elements to full operation in an asynchronous environment. The system includes a first computing unit comprising a pair of redundant computational lanes for generating redundant control commands. One or more internal monitors detect data errors in the control commands, and provide a recovery trigger to the first computing unit. A second redundant computing unit provides the same features as the first computing unit. A first actuator control unit is configured to provide blending and monitoring of the control commands from the first and second computing units, and to provide a recovery trigger to each of the first and second computing units. A second actuator control unit provides the same features as the first actuator control unit.

Abstract: A user interface is provided through which a user may specify a container for data recovery. In response to the specification of a container for recovery, another user interface is provided through which the user can select a consistency group or a journal file to be utilized for recovery. In response to receiving a selection of a journal file for data recovery, a user interface is provided through which a user may specify a point in time, an event, or a snapshot at which time recovery for the corresponding volume should occur. In response to receiving a selection of a consistency group for recovery, a user interface is provided through which a user may specify a snapshot performed across two or more volumes of the consistency group that should be utilized for recovery.

Abstract: A method is disclosed of maintaining data. The method includes the steps of providing a plurality of data storage mediums, each comprising a parity bit that provides an indication of the parity of the data in each respective data storage medium, at least one of the data storage mediums providing an exclusive OR function of a parity output bit of the at least one of the plurality of data storage mediums; encoding data provided by the exclusive OR functionality of the parity output bit to provide encoded data; time stamping the encoded data with a time stamp circuit that is coupled to the encoded data to provide time stamped encoded data; and providing the time stamped encoded data to a time-retrieval data storage medium.

Abstract: Techniques are presented for tracking status within object chains. Global objects are associated with unique identifiers and each dependent local object created within the context of a particular global object receives that particular global object's identifier. A unique counter value is maintained for each status type of each global object. The local object facilitates communicating changes in its status using the received global identifier, and the counter values are updated accordingly for the affected global object.

Abstract: A printer, image registration method, and printer system improve image data processing efficiency by tracking and storing the identical image data that is registered and stored in a printer. The image registration device has a graphics register for registering images in a printer. The graphics register sends the image data to be registered to the printer, receives an identification number from the printer, and records and stores a registered image data information file linking the image data sent to the printer with the printer identification number.

Abstract: Integrating content into a storage system with substantially immediate access to that content. Providing high reliability and relatively easy operation with a storage system using redundant information for error correction. Having the storage system perform a “virtual write,” including substantially all steps associated with writing to the media to be integrated, except for the step of actually writing data to that media, including rewriting information relating to used disk blocks, and including rewriting any redundant information maintained by the storage system. Integrating the new physical media into the storage system, including accessing content already present on that media, free space already present on that media, and reading and writing that media. Recovering from errors during integration.

Abstract: A set of log entries is automatically inspected to determine a bug. A training set is utilized to determine clustering of log identifications. Log entries are examined in real-time or retroactively and matched to clusters. Timeframe may also be matched to a cluster based on log entries associated with the timeframe. Error indications may be outputted to a user of the system in respect to a log entry or a timeframe.

Abstract: A system monitoring device retains hardware state information of a computer system and OS software state information of a hardware control instruction given by OS software and monitors and controls the entire computer system. When state change of the hardware state information and OS software state information is recognized, save information is stored in a non-volatile memory. When re-activation accompanying active replacement of the system monitoring device, which has failed, is recognized, the save information is read from the non-volatile memory, and the corresponding hardware state information and OS software state information before device failure is restored. The operating hardware is recognized according to save information, and the hardware state information generated for the recognized hardware during active replacement is restored.

Abstract: A method of regeneration of a recording state of digital data stored in a node of a data network, the method including the steps of classifying files stored in the node, periodically writing a digital file from the node to a temporary memory, the temporary memory being a component of said node, and writing the digital file from the temporary memory to the same node.

Abstract: A method and apparatus update an image stored in a memory of a device. A next block writing index n for updating a first target memory block of the memory is determined. Backup data is written to a backup block of the memory when n is an even number. The first target memory block is updated with the new data. The backup data is calculated based on a binary operation between new data corresponding to n and old data stored in a second target memory block corresponding to n+1, and the binary operation has reversibility. If n is the last block writing index, then the binary operation is not used and the backup data is the same as the new data.