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公开(公告)号：US20230376392A1
公开(公告)日：2023-11-23
申请号：US18229107
申请日：2023-08-01
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
CPC classification number: G06F11/2069 , G06F11/1435 , G06F16/1824 , G06F11/3034 , G06F16/1734 , G06F11/0787
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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公开(公告)号：US20230195622A1
公开(公告)日：2023-06-22
申请号：US17553930
申请日：2021-12-17
Applicant: NetApp Inc.
Inventor： Sudheer Kumar Vavilapalli , Asif Imtiyaz Pathan , Parag Sarfare , Nikhil Mattankot , Stephen Wu , Amit Borase
IPC: G06F12/0802 , G06F3/06
CPC classification number: G06F12/0802 , G06F3/0653 , G06F3/0619 , G06F3/0673 , G06F2212/60
Abstract: Techniques are provided for implementing a persistent key-value store for caching client data, journaling, and/or crash recovery. The persistent key-value store may be hosted as a primary cache that provides read and write access to key-value record pairs stored within the persistent key-value store. The key-value record pairs are stored within multiple chains in the persistent key-value store. Journaling is provided for the persistent key-value store such that incoming key-value record pairs are stored within active chains, and data within frozen chains is written in a distributed manner across distributed storage of a distributed cluster of nodes. If there is a failure within the distributed cluster of nodes, then the persistent key-value store may be reconstructed and used for crash recovery.
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公开(公告)号：US11269744B2
公开(公告)日：2022-03-08
申请号：US16855837
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Asif Imtiyaz Pathan , Santhosh Selvaraj , Nikhil Mattankot , Manan Patel , Travis Ryan Grusecki
Abstract: Failover methods and systems for a networked storage environment are provided. A filtering data structure and a metadata data structure are generated before starting a replay of a log stored in a non-volatile memory of a second storage node, during a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node to mirror at the log one or more write requests received by the first storage node prior to the failure, and data associated with the one or more write requests. The filtering data structure identifies each log entry and the metadata structure stores a metadata attribute of each log entry. The filtering data structure and the metadata structure are used for providing access to a logical storage object during the log replay from the second storage node.
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公开(公告)号：US20210334182A1
公开(公告)日：2021-10-28
申请号：US16855853
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Szu-Wen Kuo , Parag Sarfare , Ananthan Subramanian , Asif Imtiyaz Pathan , Santhosh Selvaraj , Nikhil Mattankot
IPC: G06F11/20 , H04L29/08 , H04L12/24 , H04L12/879
Abstract: Failover methods and systems for a networked storage environment are provided. A metadata data structure is generated, before starting a replay of entries at a log stored in a non-volatile memory of a second storage node, during a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node, and the metadata structure stores a metadata attribute of each log entry. Furthermore, the metadata attribute of each log entry is persistently stored. The persistently stored metadata attribute is used to respond to a read request received during the replay by the second storage node, while a write request metadata attribute of a write request is used for executing the write request received by the second storage node during the replay.
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公开(公告)号：US20210334180A1
公开(公告)日：2021-10-28
申请号：US16855870
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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Patent Agency Ranking
公开(公告)号：US10268410B2
公开(公告)日：2019-04-23
申请号：US14518088
申请日：2014-10-20
Applicant: NetApp, Inc.
Inventor： Jayalakshmi Pattabiraman , Nikhil Mattankot , Deekshith Belchapada , Blake H. Lewis , Subramaniam Periyagaram , Satya Suresh Chouta Naga Veera , Rohit Singh , Rajesh Khandelwal , James Robert Morefield
Abstract: A first plurality of block identifiers is sorted based, at least in part, on a measure of spatial locality. A second plurality of block identifiers is sorted based, at least in part, on the measure of spatial locality. At least the first plurality of block identifiers and the second plurality of block identifiers are incrementally merged into a third plurality of block identifiers based, at least in part, on the measure of spatial locality. A block of data corresponding to metadata associated with a plurality of block identifiers of the third plurality of block identifiers is updated.
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17.发明公开公开(公告)号：US20240020278A1
公开(公告)日：2024-01-18
申请号：US17862887
申请日：2022-07-12
Applicant: NetApp, Inc.
Inventor： Parag Sarfare , Asif Pathan , Amit Borase , Nikhil Mattankot , Sudheer Kumar Vavilapalli , Stephen Wu
IPC: G06F16/21
CPC classification number: G06F16/21
Abstract: Systems and methods are for improving latency and throughput for metadata-heavy workloads and/or workloads including metadata bursts by decoupling data journal records and metadata-only journal records are provided. According to one embodiment, expedited and independent space reclamation is facilitated by differentiating between various types of journal records chains of which should be retained until different conditions are met. For example, data journal records may be added to data journal record chains within a persistent KV store and metadata-only journal records may be added to metadata-only journal record chains within the persistent KV store. Reclamation of spaced utilized by a data journal record chain may be reclaimed after both remote node data flush has been completed and the completion of a local CP for all records in the chain, whereas records of a metadata-only journal chain may be freed independently upon completion of a local CP for all records.
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公开(公告)号：US11762744B2
公开(公告)日：2023-09-19
申请号：US17751944
申请日：2022-05-24
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
CPC classification number: G06F11/2069 , G06F11/0787 , G06F11/1435 , G06F11/3034 , G06F16/1734 , G06F16/1824
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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公开(公告)号：US20220283915A1
公开(公告)日：2022-09-08
申请号：US17751944
申请日：2022-05-24
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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公开(公告)号：US11416356B2
公开(公告)日：2022-08-16
申请号：US16855870
申请日：2020-04-22
Applicant: NETAPP, INC.
Inventor： Asif Imtiyaz Pathan , Parag Sarfare , Ananthan Subramanian , Szu-Wen Kuo , Santhosh Selvaraj , Nikhil Mattankot
Abstract: Failover methods and systems for a networked storage environment are provided. In one aspect, a read request associated with a first storage object is received, during a replay of entries of a log stored in a non-volatile memory of a second storage node for a failover operation initiated in response to a failure at a first storage node. The second storage node operates as a partner node of the first storage node. The read request is processed using a filtering data structure that is generated from the log prior to the replay and identifies each log entry. The read request is processed when the log does not have an entry associated with the read request, and when the filtering data structure includes an entry associated with the read request, the requested data is located at the non-volatile memory.
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