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    PERSISTENT KEY-VALUE STORE AND JOURNALING SYSTEM
    1.
    发明公开
    PERSISTENT KEY-VALUE STORE AND JOURNALING SYSTEM 审中-公开

    公开(公告)号：US20240232080A1

    公开(公告)日：2024-07-11

    申请号：US18615014

    申请日：2024-03-25

    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 ,  G06F3/0619 ,  G06F3/0653 ,  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.

    Network storage failover systems and associated methods
    2.
    发明授权
    Network storage failover systems and associated methods 有权

    公开(公告)号：US11216350B2

    公开(公告)日：2022-01-04

    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 ,  H04L12/879 ,  H04L12/24

    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.

    Methods for accelerating storage media access and devices thereof
    3.
    发明授权
    Methods for accelerating storage media access and devices thereof 有权

    公开(公告)号：US10936540B2

    公开(公告)日：2021-03-02

    申请号：US15921260

    申请日：2018-03-14

    Applicant: NetApp, Inc.

    Inventor： Nikhil Mattankot ,  Bharadwaj V. R. ,  Manish Katiyar ,  Aditya Kulkarni ,  Daniel Ting ,  Asif Pathan

    IPC: G06F16/00 ,  G06F16/11 ,  G06F16/14 ,  G06F16/16 ,  G06F16/13

    Abstract: Methods, non-transitory computer readable media, and computing devices that accelerate data access requests. With this technology, a hierarchy of a plurality of objects is inserted into a location database. Each of at least a subset of the plurality of objects comprises a physical storage location for data stored in a filesystem. One or more of the plurality of objects includes an object version number and a parent version number of a parent one of the plurality of objects. A determination is made when an invalidation event has occurred in the filesystem. The invalidation event is associated with one of the plurality of objects. The object version number for the one of the plurality of objects is modified to invalidate one or more of the subset of the objects, when the determining indicates that the invalidation event has occurred in the filesystem.

    Recovery mechanism with selective ordering and concurrent operations
    5.
    发明授权
    Recovery mechanism with selective ordering and concurrent operations 有权

    公开(公告)号：US12086035B2

    公开(公告)日：2024-09-10

    申请号：US17886843

    申请日：2022-08-12

    Applicant: NetApp Inc.

    Inventor： Parag Sarfare ,  Asif Pathan ,  Amit Borase ,  Nikhil Mattankot ,  Sudheer Kumar Vavilapalli ,  Stephen Wu

    IPC: G06F11/00 ,  G06F11/14

    CPC classification number: G06F11/1469 ,  G06F11/1464 ,  G06F11/1471

    Abstract: Techniques are provided for a recovery process with selective ordering and concurrent operations in order to recover from a failure. Representations of active log structures are rebuilt within memory according to ordering values assigned to I/O operations logged within the active log structures. Representation of certain active log structures may be concurrently rebuilt based upon the active log structures comprising I/O operations that are non-overlapping within a distributed file system, have no dependencies, relate to different services, and/or target independent files. Representation of stale log structures are concurrently rebuilt within memory. While rebuilding the log structures and executing the I/O operations, a key value map is concurrently rebuilt within the memory for locating data of the I/O operations. Concurrent operations during the recovery process reduces the time to complete the recovery process, and thus reduces client downtime during the recovery process.

    NETWORK STORAGE FAILOVER SYSTEMS AND ASSOCIATED METHODS
    6.
    发明申请
    NETWORK STORAGE FAILOVER SYSTEMS AND ASSOCIATED METHODS 有权

    公开(公告)号：US20210334179A1

    公开(公告)日：2021-10-28

    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

    IPC: G06F11/20 ,  G06F11/14

    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.

    Persistent key-value store and journaling system
    7.
    发明授权
    Persistent key-value store and journaling system 有权

    公开(公告)号：US11940911B2

    公开(公告)日：2024-03-26

    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 ,  G06F3/0619 ,  G06F3/0653 ,  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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