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    Resynchronization of individual volumes of a consistency group (CG) within a cross-site storage solution while maintaining synchronization of other volumes of the CG
    24.
    发明授权
    Resynchronization of individual volumes of a consistency group (CG) within a cross-site storage solution while maintaining synchronization of other volumes of the CG 有权

    公开(公告)号：US11537314B1

    公开(公告)日：2022-12-27

    申请号：US17495990

    申请日：2021-10-07

    Applicant: NetApp, Inc.

    Inventor： Murali Subramanian ,  Akhil Kaushik ,  Anoop Vijayan ,  Arun Kumar Selvam

    IPC: G06F3/06

    Abstract: Systems and methods are provided for bringing a volume of a consistency group (CG) into an in-synchronization (InSync) state while other volumes of the CG remain in the InSync state. According to an example, in order to support recovery from disruptive events in a manner that ensures a zero recovery point objective (RPO) guarantee and insulates an application making use of the CG from adverse impacts, responsive to a triggering event, a Fast Resync process may first be attempted to promptly bring an affected volume back into an in-synchronization (InSync) state from an out of synchronization (OOS) state while allowing other members of the CG to remain in the InSync state. Should the Fast resync process be unsuccessful in bringing the volume back into the InSync state within a predetermined or configurable time threshold, then a second type of resynchronization process may be employed at the CG level.

    METHODS AND SYSTEMS FOR A NON-DISRUPTIVE PLANNED FAILOVER FROM A PRIMARY COPY OF DATA AT A PRIMARY STORAGE SYSTEM TO A MIRROR COPY OF THE DATA AT A CROSS-SITE SECONDARY STORAGE SYSTEM
    25.
    发明申请
    METHODS AND SYSTEMS FOR A NON-DISRUPTIVE PLANNED FAILOVER FROM A PRIMARY COPY OF DATA AT A PRIMARY STORAGE SYSTEM TO A MIRROR COPY OF THE DATA AT A CROSS-SITE SECONDARY STORAGE SYSTEM 有权

    公开(公告)号：US20220318107A1

    公开(公告)日：2022-10-06

    申请号：US17219812

    申请日：2021-03-31

    Applicant: NetApp, Inc.

    Inventor： Akhil Kaushik ,  Anoop Vijayan ,  Omprakash Khandelwal

    IPC: G06F11/20 ,  G06F3/06

    Abstract: Systems and methods are described for a non-disruptive planned failover from a primary copy of data at a primary storage system to a mirror copy of the data at a cross-site secondary storage system. According to an example, a planned failover feature of a multi-site distributed storage system provides an order of operations such that a primary copy of a first data center continues to serve I/O operations until a mirror copy of a second data center is ready. This planned failover feature improves functionality and efficiency of the distributed storage system by providing non-disruptiveness during planned failover—even if various failures occur. The planned failover feature also includes a persistent fence to avoid serving I/O operations during a timing window when both primary data storage and secondary data storage are attempting to have a master role to serve I/O operations and this avoids a split-brain situation.

    METHODS AND SYSTEMS FOR HANDLING RACE CONDITIONS ASSOCIATED WITH A PRIMARY BIAS STATE IN A DISTRIBUTED STORAGE SYSTEM
    28.
    发明公开
    METHODS AND SYSTEMS FOR HANDLING RACE CONDITIONS ASSOCIATED WITH A PRIMARY BIAS STATE IN A DISTRIBUTED STORAGE SYSTEM 审中-公开

    公开(公告)号：US20240338145A1

    公开(公告)日：2024-10-10

    申请号：US18296834

    申请日：2023-04-06

    Applicant: NetApp, Inc.

    Inventor： Sohan Shetty ,  Anoop Vijayan ,  Akhil Kaushik ,  Rohit Chaudhary

    IPC: G06F3/06

    CPC classification number: G06F3/0655 ,  G06F3/0604 ,  G06F3/067

    Abstract: According to an example, a computer-implemented method comprises initiating a first process for atomically setting the primary bias state with a first node of a primary storage cluster of a multi-site distributed storage system due to a temporary loss of connectivity to a mediator or a temporary mediator failure, releasing an atomic lock for the first process on the first node of the primary storage cluster, sending the first process and an associated first generation indicator to a first node of a secondary storage cluster of the multi-site distributed storage system to handle the first process for setting the primary bias state, and initiating a second process for atomically clearing a primary bias state with the first node or any node of the primary storage cluster based on detecting a connection to the mediator or detecting that the mediator is available.

    Reseeding a mediator of a cross-site storage solution
    30.
    发明授权
    Reseeding a mediator of a cross-site storage solution 有权

    公开(公告)号：US11941267B2

    公开(公告)日：2024-03-26

    申请号：US18360133

    申请日：2023-07-27

    Applicant: NetApp, Inc.

    Inventor： Arul Valan ,  Anoop Vijayan ,  Akhil Kaushik

    IPC: G06F3/00 ,  G06F3/06

    CPC classification number: G06F3/0631 ,  G06F3/0604 ,  G06F3/067

    Abstract: Systems and methods for making a cross-site storage solution resilient towards mediator unavailability are provided. According to one embodiment, a stretched storage system is operable to bring a mediator associated with a primary and secondary distributed storage system back into the role of an arbitrator for peered consistency groups (CGs). A mediator reseed status indicator is maintained for multiple CGs to identify when the mediator's status information for a CG is stale. When the mediator becomes available and a local CG is identified as the subject of a mediator reseed process, the master node of the primary that hosts a master copy of a dataset for the local CG performs the reseed process, including: (i) causing relationship status information for the local CG to be updated on the mediator to the current state maintained by the primary; and (ii) resetting the mediator reseed status indicator.

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