Abstract: A method for more effectively utilizing computing resources in a data replication environment is disclosed. In one embodiment, such a method detects, at a primary system, activity occurring on the primary system. This activity is recorded in systems logs located at the primary system. The method automatically mirrors the system logs from the primary system to a secondary system that is in a mirroring relationship with the primary system. The system logs are analyzed at the secondary system. In the event abnormal activity is detected in the system logs at the secondary system, the method identifies, on the secondary system, a data set that is associated with the abnormal activity. A snapshot is taken of this data set and saved on the secondary system for later analysis. A corresponding system and computer program product are also disclosed.

Abstract: Disclosed is an improved approach to implement virtualization objects in a virtualization system. The virtualization object from a first namespace is cloned as a snapshot that is accessible within a second namespace. To implement this, the virtualization object can be mounted as a target (implemented as a snapshot) that is locally accessible to the host.

Abstract: A data management method of a data storage device having a data management unit different from a data management unit of a user device receives information regarding a storage area of a file to be deleted, from the user device, selects a storage area which matches with the data management unit of the data storage device, from among the storage area of the deleted file, and performs an erasing operation on the selected storage area which matches with the data management unit.

Abstract: A first and a second computing environments are generated on a computer system based on a state of a logical storage unit of the computer system. The computing environments are associated with pieces of storage space located outside the logical storage unit. A write operation addressing the logical storage unit in one computing environment is directed to a piece of storage space associated with that computing environment.

Abstract: An information handling system (IHS) includes a processor with a cache memory system. The processor includes a processor core with an L1 cache memory that couples to an L2 cache memory. The processor includes an arbitration mechanism that controls load and store requests to the L2 cache memory. The arbitration mechanism includes control logic that enables a load request to interrupt a store request that the L2 cache memory is currently servicing. When the L2 cache memory finishes servicing the interrupting load request, the L2 cache memory may return to servicing the interrupted store request at the point of interruption.

Abstract: Systems and methods are described for transforming a data set within a data source into a series of task calls to an on-demand code execution environment. The environment can utilize pre-initialized virtual machine instances to enable execution of user-specified code in a rapid manner, without delays typically caused by initialization of the virtual machine instances, and are often used to process data in near-real time, as it is created. However, limitations in computing resources may inhibit a user from utilizing an on-demand code execution environment to simultaneously process a large, existing data set. The present application provides a task generation system that can iteratively retrieve data items from an existing data set and generate corresponding task calls to the on-demand computing environment. The calls can be ordered to address dependencies of the data items, such as when a first data item depends on prior processing of a second data item.

Abstract: Some embodiments include a method for addressing an integrated circuit for a non-volatile memory of the EEPROM type on a bus of the I2C type. The memory includes J hardware-identification pins, with J being an integer lying between 1 and 3, which are assigned respective potentials defining an assignment code on J bits. The method includes a first mode of addressing used selectively when the assignment code is equal to a fixed reference code on J bits, and a second mode of addressing used selectively when the assignment code is different from the reference code. In the first mode, the memory plane of the non-volatile memory is addressed by a memory address contained in the last low-order bits of the slave address and in the first N bytes received. In the second mode, the memory plane is addressed by a memory address contained in the first N+1 bytes received.

Abstract: A radiation hardened, digital to analog converter includes first and second serial communication circuits, a common bus interface configured to connect the first and second serial communication circuits to first and second digital serial communication buses, respectively, and a digital to analog converter circuit, where the first and second serial communication circuits are configured to receive data over the first and second digital serial communication buses, respectively, for use by the digital to analog converter circuit.

Abstract: Use of a survival queue to manage a container-based flash cache is disclosed. In various embodiments, a corresponding survival time is associated with each of a plurality of containers stored in a flash cache, each container comprising a plurality of data blocks. The survival time may be determined based at least in part on a calculated proportion of relatively recently accessed data blocks associated with the container is associated with the container. A container to evict from the flash cache is selected based at least in part on a determination that the corresponding survival time of the selected container has expired.

Abstract: Methods and apparatus for token-based admission control for replicated writes are disclosed. Data objects are divided into partitions, and corresponding to each partition, at least a master replica and a slave replica are stored. A determination as to whether to accept a write request directed to the partition is made based at least in part on one or more of (a) available throughput capacity at the master replica, and (b) an indication, obtained using a token-based protocol, of available throughput capacity at the slave replica. If the write request is accepted, one or more data modification operations are initiated.

Abstract: There is provided a tape recording apparatus system capable of improving writing performance and maintaining tape recording density, for a multiple data writing request accompanied by a lot of synchronization requests from a host. The system is a tape storage system including two or more tape drives each of which has a tape mounted thereon and is provided with a buffer divided in fixed-length segments, and connected to a host that sends multiple data and a synchronization request at a predetermined timing to these tape drives.

Abstract: Provided is a storage device including: a first storage region comprising a plurality of sensor regions for the plurality of the sensors; a second storage region into which a data set is written, the data set being generated by reading, from the respective plurality of sensor regions, sampling data of a sensor having a longest sampling period among the plurality of sensors for one period and sampling data of other sensors for a period corresponding to the period in which the sampling data of the sensor for the one period is generated and integrating the sampling data; and a control unit configured to write the sampling data of the plurality of sensors into the plurality of sensor regions, respectively, in a ring buffer format and generate the data set at a predetermined timing and write the data set into the second storage region in the ring buffer format.

Abstract: A data de-duplication system includes a storage device that includes multiple data sets, a fixed read-only storage area, and a processing device configured to perform certain functions. The system determines whether each of the multiple data sets has met a common pattern criteria, and if so, identifies the data set as a candidate data set for de-duplication. The common pattern criteria is indicative of whether a chunk data is frequently accessed among multiple users on a cloud. The system stores data in at least one candidate data sets in the fixed storage area. For each of the at least candidate data sets, the system generates a unique pointer that corresponds to a location of the at least one candidate data sets in the fixed storage area. The system further uses the pointers to de-duplicate the at least one candidate data sets.

Abstract: According to an embodiment, a database device includes a volatile first storing unit, a non-volatile second storing unit, an access processing unit configured to execute an operation corresponding to an access request for each of a plurality of blocks obtained by dividing data pieces, a backup processing unit configured to write data of each of the plurality of blocks at a backup time to the second storing unit, and a block management unit. The block management unit writes, under certain conditions, data of any block stored in the first storing unit to the second storing unit, and reads data of a block targeted by an access request from the second storing unit to the first storing unit. The backup processing unit writes data of a block that is not yet written to the second storing unit among the plurality of blocks.

Abstract: Circuits, methods, and apparatus for storing application data, keys, authorization codes, or other information in a volatile memory on an FPGA. A field programmable gate array (FPGA) can include multiple memory blocks and partition those blocks among multiple independent reconfigurable regions. Access to the memory blocks can then be restricted so that only authorized regions have access to particular memory partitions. In addition, each partition can store multiple message authentication codes (MACs) for further controlling access to data in each partition.

Abstract: A multi-controller memory system includes a flexible channel memory controller coupled to at least first and second physical interfaces. The second physical interface is also coupled to an auxiliary memory controller. The physical interfaces may be coupled to separate memory modules. In a single-channel control mode, the memory controllers respectively control the memory modules coupled to the first and second physical interface. In a multi-channel control mode, the flexible channel memory controller controls both memory modules while the auxiliary memory controller is inactive. In a single-channel control mode, the memory controllers coordinate restricted memory control commands which access a resource shared by both modules, by one controller transmitting a request signal for the resource to the other controller, awaiting an acknowledgment signal from the other controller, and maintaining transmission of the request signal until the use of the resource is completed.

Abstract: A data storage device comprises a non-volatile semiconductor memory device and a solid-state drive controller communicatively coupled to the non-volatile semiconductor memory device, including a function level reset manager. The function level reset manager can receive a function level reset request from a host system, generate a function level reset bitmap based on the function level reset request, and broadcast the function level reset request to a command processing pipeline. The function level reset bitmap can indicate which functions are in a reset state. Further, the function level reset manager can determine which functions are in the reset state and instruct the command processing pipeline to cancel commands associated with the functions in the reset state.

Abstract: Technology is provided for partitioning a shared unified cache in a multi-processor computer system. The technology can receive a request to allocate a portion of a shared unified cache memory for storing only executable instructions, partition the cache memory into multiple partitions, and allocate one of the partitions for storing only executable instructions. The technology can further determine the size of the portion of the cache memory to be allocated for storing only executable instructions as a function of the size of the multi-processor's L1 instruction cache and the number of cores in the multi-processor.

Abstract: Systems and methods are described for transforming a data set within a data source into a series of task calls to an on-demand code execution environment or other distributed code execution environment. Such environments utilize pre-initialized virtual machine instances to enable execution of user-specified code in a rapid manner, without delays typically caused by initialization of the virtual machine instances, and are often used to process data in near-real time, as it is created. However, limitations in computing resources may inhibit a user from utilizing an on-demand code execution environment to simultaneously process a large, existing data set. The present application provides a task generation system that can iteratively retrieve data items from an existing data set and generate corresponding task calls to the on-demand computing environment, while ensuring that at least one task call for each data item within the existing data set is made.

Abstract: Memory management is provided which includes a page replacement process managed by a storage manager and a workload manager. The page replacement process swaps out the content associated with a frame of physical memory to an auxiliary storage in order to provide a free frame. The memory management process includes: determining that the physical memory runs out of free frames; providing priority information from the workload manager to the storage manager, the priority information indicating the priority or business relevance of a certain process; selecting one or more pages to be swapped to the auxiliary storage based on the priority information; and swapping out the contents of the one or more selected pages to the auxiliary storage.