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1. 发明授权

US09552384B2 Apparatus and method for single pass entropy detection on data transfer 有权
标题翻译：用于数据传输的单遍熵检测的装置和方法
公开(公告)号：US09552384B2
公开(公告)日：2017-01-24
申请号：US14744947
申请日：2015-06-19
申请人： HGST Netherlands B.V.
发明人： Ashwin Narasimha , Ashish Singhai , Vijay Karamcheti , Krishanth Skandakumaran
IPC分类号： G06F17/00 , G06F17/30
CPC分类号： G06F17/30501 , G06F11/3072 , G06F17/3033 , G06F17/30371 , G06F17/30516 , G06F17/30598
摘要： Embodiments of the present invention include a memory unit and a processor coupled to a memory unit. The processor is operable to group a plurality of subsets of data from an input data stream and compute a first hash value corresponding to a first grouped subset of data. Additionally, the processor is operable to detect a match between the first hash value and a second hash value stored in a hash table. Furthermore, the processor is also configured to monitor a hash value match frequency for the input data stream in which the processor is operable to increment a counter value responsive to a detection of the match and determine an entropy level for the input data stream based on the counter value relative to a frequent hash value match threshold. The processor can generate an instruction to either initialize performance of a data compression operation when the counter value meets or exceeds the frequent hash value match threshold or refrain from the performance of the data compression operation when the counter value fails to meet the frequent hash value match threshold.
摘要翻译：本发明的实施例包括存储器单元和耦合到存储器单元的处理器。处理器可操作以从输入数据流分组多个数据子集，并计算与第一分组的数据子集对应的第一哈希值。此外，处理器可操作以检测第一散列值和存储在散列表中的第二散列值之间的匹配。此外，处理器还被配置为监视输入数据流的散列值匹配频率，其中处理器可操作以响应于匹配的检测来递增计数器值，并且基于该输入数据流确定输入数据流的熵级计数器值相对于频繁哈希值匹配阈值。当计数器值满足或超过频繁散列值匹配阈值时，处理器可以生成指令，以便初始化数据压缩操作的性能，或者当计数器值不能满足频繁散列值匹配时，不执行数据压缩操作阈。

2. 发明授权

US10067823B2 Systems and methods for adaptive error corrective code mechanisms 有权
公开(公告)号：US10067823B2
公开(公告)日：2018-09-04
申请号：US14560767
申请日：2014-12-04
申请人： HGST Netherlands B.V.
发明人： Ashish Singhai , Ashwin Narasimha , Ajith Kumar
IPC分类号： G06F11/10 , G11C29/52
摘要： Systems and methods for managing the endurance of a solid state drive by assigning error corrective codes (ECC) to a plurality of solid state drive blocks are provided. The disclosed systems and methods can provide a plurality of error corrective codes, each code having a corresponding correction capability and assign to each solid state drive block an error corrective code, according to a reliability of the solid state drive block. Moreover, the disclosed systems and methods can group the solid state drive blocks into groups according to their assigned error corrective codes and apply, for each group of solid state drive block, a level of ECC correction according to the assigned error corrective code of each group.

3. 发明授权

US10089360B2 Apparatus and method for single pass entropy detection on data transfer 有权
公开(公告)号：US10089360B2
公开(公告)日：2018-10-02
申请号：US15380826
申请日：2016-12-15
申请人： HGST Netherlands B.V.
发明人： Ashwin Narasimha , Ashish Singhai , Vijay Karamcheti , Krishanth Skandakumaran
IPC分类号： G06F17/00 , G06F17/30 , G06F11/30
摘要： Embodiments of the present invention include a memory unit and a processor coupled to a memory unit. The processor is operable to group a plurality of subsets of data from an input data stream and compute a first hash value corresponding to a first grouped subset of data. Additionally, the processor is operable to detect a match between the first hash value and a second hash value stored in a hash table. Furthermore, the processor is also configured to monitor a hash value match frequency for the input data stream in which the processor is operable to increment a counter value responsive to a detection of the match and determine an entropy level for the input data stream based on the counter value relative to a frequent hash value match threshold. The processor can generate an instruction to either initialize performance of a data compression operation when the counter value meets or exceeds the frequent hash value match threshold or refrain from the performance of the data compression operation when the counter value fails to meet the frequent hash value match threshold.

4. 发明授权

US09940036B2 System and method for controlling various aspects of PCIe direct attached nonvolatile memory storage subsystems 有权
公开(公告)号：US09940036B2
公开(公告)日：2018-04-10
申请号：US14493560
申请日：2014-09-23
申请人： HGST Netherlands B.V.
发明人： Krishanth Skandakumaran , Arun Kumar Medapati , Sri Rama Namala , Ashwin Narasimha , Ajith Kumar B
IPC分类号： G06F13/36 , G06F13/20 , G06F1/00 , G06F1/26 , G06F1/32 , G06F3/06 , G06F13/42
CPC分类号： G06F3/0613 , G06F3/0625 , G06F3/0653 , G06F3/0659 , G06F3/0688 , G06F13/4221 , Y02D10/14 , Y02D10/151
摘要： Techniques for controlling PCIe direct attached non-volatile memory storage system are disclosed. In one particular embodiment, the techniques may be realized as a method including monitoring a temperature of a memory attached via the PCIe interface, determining whether an operation implemented on the attached memory has caused the temperature of the memory to exceed a preset threshold, and controlling an I/O rate of the attached memory based on the determination such that the I/O rate is greater than zero.

5. 发明申请

US20170255402A1 Efficient Cross Device Redundancy Implementation on High Performance Direct Attached Non-Volatile Storage With Data Reduction 审中-公开
公开(公告)号：US20170255402A1
公开(公告)日：2017-09-07
申请号：US15058461
申请日：2016-03-02
申请人： HGST Netherlands B.V.
发明人： Ashwin Narasimha , Krishanth Skandakumaran , Vijay Karamcheti , Ashish Singhai
IPC分类号： G06F3/06 , G06F13/28 , G06F12/14
CPC分类号： G06F13/28 , G06F3/061 , G06F3/064 , G06F3/0659 , G06F3/0688 , G06F12/1408 , G06F2212/402
摘要： A method for implementing cross device redundancy schemes with a single commit by receiving, by a write page allocation unit, a request to allocate data grains; responsive to receiving the request, performing, by the write page allocation unit, an analysis of a predetermined data layout map associated with a grain memory to identify a memory segment; allocating, by the write page allocation unit, a number of data grains to the memory segment, while computing redundancy data associated with the number of data grains; storing the number of data grains and the redundancy data to the memory segment of the grain memory; determining, by the write page allocation unit, whether a storage threshold associated with the grain memory has been satisfied; and responsive to the storage threshold associated with the grain memory being satisfied, transmitting data grains and redundancy data stored in the memory segment to one or more storage devices.

6. 发明授权

US09619326B2 Methods and systems for implementing redundancy in memory controllers 有权
公开(公告)号：US09619326B2
公开(公告)日：2017-04-11
申请号：US14564798
申请日：2014-12-09
申请人： HGST Netherlands B.V.
发明人： Ashish Singhai , Ashwin Narasimha , Kenneth Alan Okin
IPC分类号： G06F11/10 , G11C29/00
CPC分类号： G06F11/1068 , G06F11/108 , G11C29/765
摘要： The present disclosure relates to methods and systems for implementing redundancy in memory controllers. The disclosed systems and methods utilize a row of memory blocks, such that each memory block in the row is associated with an independent media unit. Failures of the media units are not correlated, and therefore, a failure in one unit does not affect the data stored in the other units. Parity information associated with the data stored in the memory blocks is stored in a separate memory block. If the data in a single memory block has been corrupted, the data stored in the remaining memory blocks and the parity information is used to retrieve the corrupted data.

7. 发明授权

US10078646B2 Hardware efficient fingerprinting 有权
公开(公告)号：US10078646B2
公开(公告)日：2018-09-18
申请号：US14835622
申请日：2015-08-25
申请人： HGST Netherlands B.V.
发明人： Zvonimir Bandic , Cyril Guyot , Dongyang Li , Ashwin Narasimha , Qingbo Wang , Ken Yang
IPC分类号： G06F17/30 , H03M7/30
CPC分类号： G06F16/215 , G06F16/2365 , H03M7/3091 , H03M7/3093 , H03M7/6029
摘要： An approach for fingerprinting large data objects at the wire speed has been disclosed. The techniques include Fresh/Shift pipelining, split Fresh, optimization, online channel sampling, and pipelined selection. The architecture can also be replicated to work in parallel for higher system throughput. Fingerprinting may provide an efficient mechanism for identifying duplication in a data stream, and deduplication based on the identified fingerprints may provide reduced storage costs, reduced network bandwidth consumption, reduced processing time and other benefits. In some embodiments, fingerprinting may be used to ensure or verify data integrity and may facilitate detection of corruption or tampering. An efficient manner of generating fingerprints (either via hardware, software, or a combination) may reduce a computation load and/or time required to generate fingerprints.

8. 发明申请

US20170123677A1 Integration of Reference Sets with Segment Flash Management 审中-公开
公开(公告)号：US20170123677A1
公开(公告)日：2017-05-04
申请号：US14932856
申请日：2015-11-04
申请人： HGST Netherlands B.V.
发明人： Ashish Singhai , Saurabh Manchanda , Ashwin Narasimha , Vijay Karamcheti
IPC分类号： G06F3/06
CPC分类号： G06F16/174 , G06F11/1441 , G06F16/00
摘要： A system comprising a processor and a memory storing instructions that, when executed, cause the system to retrieve data blocks from a data store; identify an association between the retrieved data blocks and one or more reference data sets stored in the data store, wherein the association reflects a common dependency of the retrieved data blocks to the one or more reference data sets; generate a segment including the data blocks that depend on the common reference data set; generate a first identifier for the segment and track the segment using the first identifier.

9. 发明申请

US20170123676A1 Reference Block Aggregating into a Reference Set for Deduplication in Memory Management 审中-公开
公开(公告)号：US20170123676A1
公开(公告)日：2017-05-04
申请号：US14932842
申请日：2015-11-04
申请人： HGST Netherlands B.V.
发明人： Ashish Singhai , Saurabh Manchanda , Ashwin Narasimha , Vijay Karamcheti
IPC分类号： G06F3/06
CPC分类号： G06F3/0608 , G06F3/0641 , G06F3/0679 , G06F11/14
摘要： A system comprising a processor and a memory storing instructions that, when executed, cause the system to retrieve reference data blocks from a data store, aggregate the reference data blocks into a first set based on a criterion, generate a reference data set based on a portion of the first set including the reference data blocks and store the reference data set in the data store.

10. 发明授权

US09678665B2 Methods and systems for memory page allocation 有权
公开(公告)号：US09678665B2
公开(公告)日：2017-06-13
申请号：US14640944
申请日：2015-03-06
申请人： HGST Netherlands B.V.
发明人： Vijay Karamcheti , Ashwin Narasimha , Ashish Singhai
IPC分类号： G06F3/06 , G06F11/00
CPC分类号： G06F3/0604 , G06F3/061 , G06F3/0631 , G06F3/0638 , G06F3/0679 , G06F3/0688 , G06F3/0689 , G06F11/00
摘要： Techniques for improving memory page allocation are disclosed. In some embodiments, the techniques may be realized as a method for improving memory page allocation including generating, using a compression unit, compressed grains associated with compressed blocks, identifying a write page allocation unit to query, receiving, at the write page allocation unit, a query for a flash memory location to store the compressed grains, determining a flash memory location for the compressed grains, determining a parity location for the compressed grains, returning offsets indicating the flash memory location and the parity location, sending the compressed grains to the free grain location and a parity bit to the parity location as part of an atomic transaction, and recording a start location of compressed grains in a mapping.

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