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公开(公告)号：US11321169B2
公开(公告)日：2022-05-03
申请号：US16945358
申请日：2020-07-31
发明人： Vamsi K. Vankamamidi , Philippe Armangau , Geng Han , Xinlei Xu
摘要： A technique of protecting data in a data storage system includes, in response to receiving a write request that specifies data to be written in the data storage system, calculating an error detection code (EDC) of the specified data. The technique further includes persisting the specified data and the EDC in persistent cache and, in response to receiving a read request for reading the specified data, validating the specified data using the EDC before returning the specified data in satisfaction of the read request.
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公开(公告)号：US20220100621A1
公开(公告)日：2022-03-31
申请号：US17038534
申请日：2020-09-30
发明人： Hongpo Gao , Philippe Armangau , Geng Han , Jian Gao , Shaoqin Gong
摘要： In response to failure of a data storage drive, data previously stored on the failed drive is rebuilt on a replacement data storage drive by executing drive rebuild jobs on a first set of processor cores. While the data previously stored on the failed data storage drive is being rebuilt, a second set of processor cores is used to process host I/O (Input/Output) requests. The host I/O requests processed by the second set of processor cores may be a first set of host I/O requests processed during the data rebuild. When a current total number of outstanding host I/O requests exceeds a threshold maximum number of outstanding host I/O requests, at least one processor core in the first set of processor cores may be used to process a second set of host I/O requests while the data previously stored on the failed data storage drive is being rebuilt.
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公开(公告)号：US11269738B2
公开(公告)日：2022-03-08
申请号：US16670036
申请日：2019-10-31
发明人： Philippe Armangau , Vamsi K. Vankamamidi , Socheavy D. Heng , Geng Han , Jian Gao , Hongpo Gao
摘要： A method, computer program product, and computer system for identifying a bit for an allocation unit. It may be determined if data has been modified on the allocation unit while degraded. A rebuild of the allocation unit may be executed when the bit is a first value. The rebuild of the allocation unit may be skipped when the bit is a second value.
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公开(公告)号：US20220035698A1
公开(公告)日：2022-02-03
申请号：US16945358
申请日：2020-07-31
发明人： Vamsi K. Vankamamidi , Philippe Armangau , Geng Han , Xinlei Xu
摘要： A technique of protecting data in a data storage system includes, in response to receiving a write request that specifies data to be written in the data storage system, calculating an error detection code (EDC) of the specified data. The technique further includes persisting the specified data and the EDC in persistent cache and, in response to receiving a read request for reading the specified data, validating the specified data using the EDC before returning the specified data in satisfaction of the read request.
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公开(公告)号：US11221991B2
公开(公告)日：2022-01-11
申请号：US16174791
申请日：2018-10-30
发明人： Ivan Bassov , Philippe Armangau , Sorin Faibish , Istvan Gonczi
IPC分类号： G06F7/00 , G06F17/00 , G06F16/174 , H03M7/40 , G06F3/06
摘要： Techniques for data processing may include: receiving a data chunk of the data set; determining, in accordance with criteria including a compressibility ratio for the data set and a cost ratio of compression computation cost and entropy computation cost, whether to activate or deactivate entropy computation for the data set, wherein the compressibility ratio is ratio of a number of compressible data chunks of the data set and a number of uncompressible data chunks of the data set; and responsive to determining to activate entropy computation for the data set, performing first processing comprising: determining an entropy value for the data chunk; and determining, in accordance with the entropy value for the data chunk, whether to compress the data chunk.
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公开(公告)号：US11221948B2
公开(公告)日：2022-01-11
申请号：US16663507
申请日：2019-10-25
IPC分类号： G06F12/02
摘要： Coordinating a reclaiming of data storage space among processing nodes of a data storage system includes, by a first node in response to an event, performing local cleanup of first-node mapping data and issuing a request message to a second node, the request message identifying the data storage space to be reclaimed. The event may be a notification from a RAID component rebuilding a RAID volume. In response to the request message, the second node performs local cleanup of second-node mapping data and issues a completion message to the first node indicating that the second node has completed its part of the reclaiming of the data storage space. The first node responds to the completion message by marking the data storage space as being reclaimed and signaling to a source of the event that the data storage space is available for new use.
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97.发明授权公开(公告)号：US11216195B1
公开(公告)日：2022-01-04
申请号：US16945383
申请日：2020-07-31
IPC分类号： G06F3/06 , G06F12/0871 , G06F12/0804
摘要： An allocation history is maintained for each node in a multi-node data storage system. The allocation history for each node indicates sets of physical blocks previously allocated to the node to store dirty pages of user data flushed from a cache of the node. The allocation history indicates non-quarantined sets of physical blocks that are currently being used to provide non-volatile data storage to cache flush operations, and quarantined sets of physical blocks not currently being used to provide non-volatile data storage to cache flush operations. Allocation is prevented to any node of any set of physical blocks that is indicated as non-quarantined by any of the allocation histories, and of any set of physical blocks that is indicated as quarantined by any of the allocation histories.
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公开(公告)号：US11210230B2
公开(公告)日：2021-12-28
申请号：US16863433
申请日：2020-04-30
发明人： Sorin Faibish , Philip Shilane , Philippe Armangau
IPC分类号： G06F12/08 , G06F12/0891 , G06F12/0864
摘要： Techniques are provided for inline deduplication based on a number of physical blocks having common fingerprints among multiple entries of a buffer cache. One method comprises storing input/output operations in a first cache comprising a plurality of entries each corresponding to a physical storage entity comprising a plurality of physical blocks. A given entry is maintained in the first cache based on a first number of physical blocks of the given entry having a duplicate fingerprint with at least one physical block of another entry in the first cache. A second number can be determined of the physical blocks of each entry having a fingerprint in a second cache, and a first ratio is determined for two entries in the first cache using the second number and the first number. A comparison of the first ratios can be performed to sort and possibly evict entries in the first cache based on the comparison.
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公开(公告)号：US20210374126A1
公开(公告)日：2021-12-02
申请号：US16887697
申请日：2020-05-29
IPC分类号： G06F16/23 , G06F12/121
摘要： A technique for managing a datapath of a data storage system includes receiving a request to access target data and creating a transaction that includes multiple datapath elements in a cache, where the datapath elements are used for accessing the target data. In response to detecting that one of the datapath elements is invalid, the technique further includes processing the transaction in a rescue mode. The rescue mode attempts to replace each invalid datapath element of the transaction with a valid version thereof obtained from elsewhere in the data storage system. The technique further includes committing the transaction as processed in the rescue mode.
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公开(公告)号：US11176034B2
公开(公告)日：2021-11-16
申请号：US16592588
申请日：2019-10-03
IPC分类号： G06F12/02 , G06F12/123
摘要： A method, computer program product, and computer system for receiving, by a computing device, new data to write to a leaf. At least two timestamps of the leaf may be examined. It may be determined whether a time interval between the at least two timestamps of the leaf is greater than an age threshold. The new data may be written to a first tier storage device when the time interval between the at least two timestamps of the leaf is less than the age threshold; The new data may be written to a second tier storage device when the time interval between the at least two timestamps of the leaf is greater than the age threshold.
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