Abstract: A method and a computer system for asymmetric replication of data are provided. Storage of a set of data is organized as a first copy and as a second copy in non-volatile storage. The second copy is reliable and stored so as to be readable at a speed slower than for the first copy. A read instruction regarding the set of data is received and performed preferentially via the first copy such that the asymmetric replication achieves enhanced performance speed. A request to execute a write operation is received. The write operation is executed to the first copy and to the second copy. In response to determining that the write operation to the first copy was unsuccessful, a label for the first copy is set as stale.

Abstract: A storage system and method for host memory access are provided. In one embodiment, a storage system is configured to receive a write command from a host that is recognized by the storage system as a read host memory command and receive a read command from the host that is recognized by the storage system as a write host memory command. This provides a communication channel that allows the storage system to access the host memory. The storage system can use the host memory as a backup write cache and/or to stream data of different types stored in different areas of the host memory. Hibernation can be avoided, and timeout delays can be ignored. Other embodiments are provided.

Abstract: A data storage method implemented by a storage node in a distributed storage system includes receiving first data of a first strip in a first stripe, wherein the first stripe comprises a first plurality of strips, receiving second data of a second strip in a second stripe, wherein the second strip comprises a second plurality of strips, wherein a first logical address of the first data is the same as a second logical address of the second data, and generating a record indicating that the first data reaches the storage node before the second data.

Abstract: Techniques are described for managing access of executing programs to non-local block data storage. In some situations, a block data storage service uses multiple server storage systems to reliably store network-accessible block data storage volumes that may be used by programs executing on other physical computing systems. A group of multiple server block data storage systems that store block data volumes may in some situations be co-located at a data center, and programs that use volumes stored there may execute on other physical computing systems at that data center. If a program using a volume becomes unavailable, another program (e.g., another copy of the same program) may in some situations obtain access to and continue to use the same volume, such as in an automatic manner in some such situations.

Abstract: An error detection and correction method for a flash memory includes: a setting step, setting selection information to select a first error detection and correction function for performing 1-bit error detection and correction or a second error detection and correction function for performing multiple-bit error detection and correction; and an executing step, performing the first error detection and correction function or the second error detection and correction function based on the selection information during a read operation or a write operation.

Abstract: A method of operating a storage device including a plurality of nonvolatile memories, each of the plurality of nonvolatile memories including a temperature sensor, includes checking whether a predetermined temperature check cycle for the plurality of nonvolatile memories has been reached, monitoring, in response to the checking result, temperature information of at least some of the plurality of nonvolatile memories using the temperature sensor, obtaining standing time information of the plurality of nonvolatile memories by applying a temperature acceleration condition based on the monitored temperature information, and changing at least one of a plurality of driving parameters required for operating each of the plurality of nonvolatile memories based on at least one of the monitored temperature information and the obtained standing time information.

Abstract: Example embodiments relate generally to data resynchronization methods and systems in continuous data protection (CDP) and more specifically to an input and output (I/O) filtering framework and log management system to seek a near-zero recovery point objective (RPO).

Abstract: A system and method for performing data striping and data protection, may include: obtaining, in a network interface controller (NIC) from a host processor, a command to store data in a storage system, wherein the host processor is connected to a network through the NIC; dividing, by the NIC, the data into a plurality of portions; mapping, by the NIC, each of the plurality of portions to at least one of a plurality of storage targets, wherein the plurality of storage targets are connected to the NIC over the network; and, transferring, by the NIC, each of the plurality of portions to the mapped at least one storage target.

Abstract: A data storage device includes a memory device and a controller coupled to the memory device. The controller is configured to store a plurality of codewords in the memory device. Each codeword of the plurality of codewords includes host data and parity data corresponding to the host data. Less than all of the plurality of codewords further includes statistics corresponding to the host data. Each statistic of the plurality of codewords is the same or different as another statistic of the plurality of codewords. The statistics are either incremental statistics, adaptive statistics, or both incremental statistics and adaptive statistics.

Abstract: A Data Storage Device (DSD) includes one or more magnetic disks. One or more data blocks are encoded into a first plurality of Error Correction Code (ECC) sub-blocks including a first ECC sub-block. The first plurality of ECC sub-blocks is encoded into a first ECC super-block. The first ECC sub-block is write-verified by reading the first ECC super-block. If the write-verify passes, a second plurality of ECC sub-blocks is encoded into a subsequent ECC super-block. If the write-verify fails, the first ECC sub-block and a subset of the second plurality of ECC sub-blocks are encoded into the subsequent ECC super-block. In another aspect, in response to the first ECC super-block failing to recover the first ECC sub-block, a subsequent ECC super-block is read and a copy of the first ECC sub-block is used if the copy is detected in the subsequent ECC super-block.

Abstract: Disclosed herein are related to an age detector for determining an age of a memory block, and a method of operation of the age detector. In one configuration, a memory system includes a memory block and an age detector coupled to the memory block. In one aspect, the memory block generates a first set of data in response to a first power on, and generates a second set of data in response to a second power on. In one configuration, the age detector includes a storage block to store the first set of data from the memory block, and inconsistency detector to compare the first set of data and the second set of data. In one configuration, the age detector includes a controller to determine an age of the memory block, based on the comparison.

Abstract: A system for shutting down a process of a database is provided. In some aspects, the system performs operations including tracking, during startup of a process, code locations of a process in the at least one memory. The operations may further include tracking, during runtime of the process and in response to the tracking the code locations, memory segments of the at least one memory allocated to the process. The operations may further include receiving an indication for a shutdown of a process. The operations may further include waking, in response to the indication, at least one processing thread of a plurality of processing threads allocated to a database system. The operations may further include allocating a list of memory mappings to the plurality of processing threads. The operations may further include freeing, by the first processing thread, the physical memory assigned to the processing thread by the memory mappings.

Abstract: Apparatus and methods are disclosed, including providing available data operations for the storage system processor to a host processor, identifying data operations to be performed by the storage system processor, and assigning identified data operations to the storage system processor to reduce bus traffic between the host processor and the storage system processor, to improve host processor performance, and to reduce energy use by the host processor.

Abstract: A computer program product and a data storage device including first and second storage controllers operating in active-passive mode with a shared disk. Each storage controller includes a storage device storing program instructions and a processor to process the program instructions and perform various operations. The operations include receiving a task to be performed by the storage device containing the first and second storage controllers, wherein the first storage controller is currently operating as an active storage controller and the second storage controller is currently operating as a passive storage controller. The operations further include determining whether the received task has a high priority or a low priority, performing the received task in response to determining that the received task has a high priority, and delegating the received task to the second storage controller for performance in response to determining that the received task has a low priority.

Abstract: A reference snapshot selection technique is configured to select a reference snapshot resolution algorithm used to determine an appropriate reference snapshot that may be employed to perform incremental snapshot replication of workload data between primary and secondary sites in a data replication environment. A reference resolution procedure is configured to process a set of constraints from the data replication environment to dynamically select the reference snapshot resolution algorithm based on a figure of merit that satisfies administrative constraints to reduce or optimize resource utilization in the data replication environment.

Abstract: A service, responsive to a request, determines a scope that includes a specific tenant and a specific component. The service is extensible through addition of different components to manage different data sources used by different services that contribute to a set of one or more multi-tenant cloud services. The service also determines, for the specific component, parameters usable to identify the specific tenant and a specific storage path. Each of the components, responsive to being called to perform a backup or restore with a current set of parameters, is to be implemented to cause data, which belongs to a currently identified tenant, to be copied between the respective one of the data sources and a backup store according to a currently identified storage path. The service also calls the specific component to perform the backup or restore with the parameters.

Abstract: Disclosed herein are systems and method for selectively restoring a computer system to an operational state. In an exemplary aspect, the method may create a backup image of the computer system comprising a set of data blocks, and create and start a virtual machine based on the backup image. The method may identify a subset of the data blocks accessed from the backup image during startup of the virtual machine. In response to determining that the computer system should be restored, the method may restore the subset of the data blocks such that the computer system is operational during startup, and restore a remaining set of the data blocks from the backup image after the startup of the computer system.

Abstract: A processing device in a memory sub-system sends a program command to the memory device to cause the memory device to initiate a program operation on a corresponding wordline and sub-block of a memory array of the memory device. The processing device further receives a request to perform a read operation on data stored on the wordline and sub-block of the memory array, sends a suspend command to the memory device to cause the memory device to suspend the program operation, reads data corresponding to the read operation from a page cache of the memory device, and sends a resume command to the memory device to cause the memory device to resume the program operation.

Abstract: The present invention provides a control method of a flash memory controller wherein the control method includes the steps of: selecting a first block; reading pages of the first block and determining a bit error rate or a bit error count of each page; for each of the pages, if the bit error rate or the bit error count of the page is not greater than a first threshold value, moving the data of the page into a second block; and for each of the pages, if the bit error rate or the bit error count of the page is greater than the first threshold value, moving the data of the page into a third block; wherein a number of pages corresponding to a word line of the second block is less than a number of pages corresponding to a word line of the third block.

Abstract: Disclosed herein are a hybrid memory management apparatus and method for an many-to-one virtualization environment. The hybrid memory management apparatus is implemented in an inverse-virtualization-based multi-node computing system including multiple physical nodes, each containing hybrid memory in which DRAM and NVRAM coexist, a virtual machine, and hypervisors, and includes memory for storing at least one program, and a processor for executing the program, wherein the program includes a remote request service module for processing a page-related request with reference to the hybrid memory and responding to the page-related request by transmitting a result of processing, an internal request service module for processing an internal page fault request with reference to a hybrid memory and responding to the internal page fault request, and a data arrangement module for responding to an inquiry request for a location at which a newly added page is to be arranged in the hybrid memory.