Abstract: Techniques for selecting a storage node of a storage system to store data include applying a first function to at least some data chunks of an extent to provide respective first values for each of the at least some data chunks. A storage node, included within multiple storage nodes of a storage system, is selected to store the extent based on a majority vote derived from the respective first values.

Abstract: A computer-implemented method, according to one embodiment, includes: detecting at least one read of a logical page straddled across codewords, storing an indication of a number of detected reads of the straddled logical page, and relocating the straddled logical page to a different physical location in response to the number of detected reads of the straddled logical page. When relocated, the logical page is written to the different physical location in a non-straddled manner. Other systems, methods, and computer program products are described in additional embodiments.

Abstract: A computer-implemented method is provided which includes: assigning data having a first heat to a first data stream, assigning data having a second heat to a second data stream, determining an anticipated throughput of each of the first and second data streams, assigning a first number of logical erase blocks of non-volatile memory to the first data stream based on the anticipated throughput of the first data stream, and assigning a second number of logical erase blocks of non-volatile memory to the second data stream based on the anticipated throughput of the second data stream. The number of logical erase blocks assigned to the data streams may be statically assigned, or may be adjusted dynamically based on at least one of temporal stream throughput, stream stall events, a current workload, or other factors. The non-volatile memory may include NAND flash memory, and wear leveling may be performed on all open logical erase blocks prior to assigning the first and second numbers of erase blocks.

Abstract: An apparatus, according to one embodiment, includes: one or more memory devices, each memory device comprising non-volatile memory configured to store data, and a memory controller connected to the one or more memory devices. The memory controller is configured to: detect at least one read of a logical page straddled across codewords, store an indication of a number of detected reads of the straddled logical page, and relocate the straddled logical page to a different physical location in response to the number of detected reads of the straddled logical page, wherein the logical page is written to the different physical location in a non-straddled manner. Other systems, methods, and computer program products are described in additional embodiments.

Abstract: In one embodiment, a computer-implemented method includes determining, by a processor, after the writing of data to a non-volatile memory block, one or more delta threshold voltage shift (TVS?) values configured to track temporary changes with respect to changes in the underlying threshold voltage distributions due to retention and/or read disturb errors. One or more overall threshold voltage shift values is calculated for the data written to the non-volatile memory block, the one or more overall threshold voltage shift values being a function of the one or more TVS? values to be used when writing data to the non-volatile memory block. The one or more overall threshold voltage shift values are stored.

Abstract: Techniques for data deduplication in a data storage system include comparing a first attribute of a received data page to first attributes of one or more stored data pages. In response to the first attribute matching one of the first attributes, a second attribute of the received data page is compared to second attributes of the one or more data pages. In response to the second attribute of the received data page matching one of the second attributes, a fingerprint of the received data page is compared to fingerprints of the one or more data pages. In response to the fingerprint of the received data page matching one of the fingerprints, the received data page is discarded and replaced with a reference to the corresponding data page already stored in the storage system. In response to first attribute, the second attribute, or the fingerprint of the received data page not matching, the received data page is stored.

Abstract: In at least one embodiment, a controller of a non-volatile memory array including a plurality of subdivisions stores write data within the non-volatile memory array utilizing a plurality of block stripes of differing numbers of blocks, where all of the blocks within each block stripe are drawn from different ones of the plurality of subdivisions. The controller builds new block stripes for storing write data from blocks selected based on estimated remaining endurances of blocks in each of the plurality of subdivisions.

Abstract: A system, according to one embodiment, includes: non-volatile memory; a non-volatile memory controller having a cache; and logic integrated with and/or executable by the non-volatile memory controller, the logic being configured to: retrieve a physical block address corresponding to a logic block address; extract information from the physical block address; perform a lookup operation in cache using the extracted information; perform a range check of the physical block address in response to the lookup operation succeeding; and read data from the cache in response to the range check succeeding. An architecture of the cache supports separation of data streams, in addition to supporting parallel writes to different non-volatile memory channels. The cache architecture also supports pipelining of the parallel writes to different non-volatile memory planes. The non-volatile memory controller is also configured to perform a direct memory lookup in the cache based on a physical block address.

Abstract: Techniques for selecting a storage node of a storage system to store data include applying a first function to at least some data chunks of an extent to provide respective first values for each of the at least some data chunks. A storage node, included within multiple storage nodes of a storage system, is selected to store the extent based on a majority vote derived from the respective first values.

Abstract: Techniques for data deduplication in a data storage system include comparing a first attribute of a received data page to first attributes of one or more stored data pages. In response to the first attribute matching one of the first attributes, a second attribute of the received data page is compared to second attributes of the one or more data pages. In response to the second attribute of the received data page matching one of the second attributes, a fingerprint of the received data page is compared to fingerprints of the one or more data pages. In response to the fingerprint of the received data page matching one of the fingerprints, the received data page is discarded and replaced with a reference to the corresponding data page already stored in the storage system. In response to first attribute, the second attribute, or the fingerprint of the received data page not matching, the received data page is stored.

Abstract: A system according to one embodiment includes non-volatile memory, and a non-volatile memory controller having a cache. An architecture of the cache supports separation of data streams, and the cache architecture supports parallel writes to different non-volatile memory channels. Additionally, the cache architecture supports pipelining of the parallel writes to different non-volatile memory planes. Furthermore, the non-volatile memory controller is configured to perform a direct memory lookup in the cache based on a physical block address. Other systems, methods, and computer program products are described in additional embodiments.

Abstract: A method for managing a memory is disclosed, the memory including a set of units and a unit comprising a set of pages, wherein a unit of the set of units is erasable as a whole by a unit reclaiming process resulting in a free unit available for writing data to. The method includes maintaining a first pool of units available for reclamation by the unit reclaiming process; maintaining a second pool of units not available for reclamation by the unit reclaiming process; moving a first unit from the first pool to the second pool in response to invalidating a first one of the pages contained in the first unit; returning the first unit from the second pool to the first pool after a defined number of units of the set have been written; and selecting a unit out of the first pool for reclamation by the unit reclaiming process.

Abstract: A technique for adapting over-provisioning space in a storage system includes determining one or more workload characteristics in the storage system. Over-provisioning space in the storage system is then adjusted to achieve a target write amplification for the storage system, based on the workload characteristics.

Abstract: A technique for garbage collection in a storage system includes generating regrouping metadata for one or more pages of at least two logical erase blocks (LEB). The regrouping metadata indicates an associated stream for each of the pages. Multiple of the LEBs that include valid pages associated with a first stream are selected, based on the regrouping metadata, for regrouping. The valid pages associated with the first stream from the selected LEBs are regrouped into a new LEB.

Abstract: A technique for garbage collection in a data storage system includes determining a dirty physical byte count for each of a plurality of candidate garbage collection units. The dirty physical byte count provides a total amount of dirty bytes. At least one of a dirty physical codeword container count and a dirty physical page count is determined for each of the candidate garbage collection units. The dirty physical codeword container count provides an amount of physical codeword containers that are completely dirty and the dirty physical page count provides an amount of physical pages that are completely dirty. A garbage collection unit, included in the candidate garbage collection units, is selected for garbage collection based on the dirty physical byte count and at least one of the dirty physical codeword container count and the dirty physical page count.

Abstract: A technique for garbage collection in a data storage system includes determining a dirty physical byte count for each of a plurality of candidate garbage collection units. The dirty physical byte count provides a total amount of dirty bytes. At least one of a dirty physical codeword container count and a dirty physical page count is determined for each of the candidate garbage collection units. The dirty physical codeword container count provides an amount of physical codeword containers that are completely dirty and the dirty physical page count provides an amount of physical pages that are completely dirty. A garbage collection unit, included in the candidate garbage collection units, is selected for garbage collection based on the dirty physical byte count and at least one of the dirty physical codeword container count and the dirty physical page count.

Abstract: A mechanism is provided in a non-volatile memory controller for reducing read access latency by straddling pages across non-volatile memory channels. Responsive to a request to write a logical page to a non-volatile memory array, the non-volatile memory controller determines whether the logical page fits into a current physical page. Responsive to determining the logical page does not fit into the current physical page, the non-volatile memory controller writes a first portion of the logical page to a first physical page in a first block and writes a second portion of the logical page to a second physical page in a second block. The first physical page and the second physical page are on different non-volatile memory channels.

Abstract: In one embodiment, an apparatus includes one or more memory devices, each memory device having non-volatile memory configured to store data, and a memory controller connected to the one or more memory devices, the memory controller being configured to receive data to be stored to the one or more memory devices, store read-hot data within one error correction code (ECC) codeword as aligned data, and store read-cold data to straddle two or more ECC codewords as non-aligned data and/or dispersed data. According to another embodiment, a method for storing data to non-volatile memory includes receiving data to store to one or more memory devices, each memory device including non-volatile memory configured to store data, storing read-hot data within one ECC codeword as aligned data, and storing read-cold data to straddle two or more ECC codewords as non-aligned data and/or dispersed data.

Abstract: A computer-implemented method, according to one embodiment, includes: maintaining, by a processor, a first open logical erase block for user writes; maintaining, by the processor, a second open logical erase block for relocate writes; receiving, by the processor, a first data stream having the user writes; transferring, by the processor, the first data stream to the first open logical erase block; receiving, by the processor, a second data stream having the relocate writes; and transferring, by the processor, the second data stream to the second open logical erase block. Moreover, the first and second open logical erase blocks are different logical erase blocks. Other systems, methods, and computer program products are described in additional embodiments.

Abstract: Techniques for selecting a storage node of a storage system to store data include applying a first function to at least some data chunks of an extent to provide respective first values for each of the at least some data chunks. A storage node, included within multiple storage nodes of a storage system, is selected to store the extent based on a majority vote derived from the respective first values.