公开(公告)号：US12164396B2

公开(公告)日：2024-12-10

申请号：US18160568

申请日：2023-01-27

Applicant: NetApp, Inc.

Inventor： Sohan Shetty ,  Akhil Kaushik

IPC: G06F11/16 ,  G06F11/20 ,  G06F16/27

Abstract: A computer-implemented method comprises providing a synchronous replication relationship from one or more storage objects of a first storage node to one or more replicated storage objects of a second storage node, providing an asynchronous replication relationship with an asynchronous update schedule from the one or more storage objects of the first storage node to one or more replicated storage objects of the third storage node to provide a protection configuration, tracking, with the third storage node of the tertiary site, a state of the secondary storage site, automatically performing a failover from the primary storage site to the secondary storage site and activating a synchronous mirror copy for the one or more replicated storage objects of the second storage node, and automatically initiating realignment and reconfiguration of the protection configuration to the tertiary storage site based upon the state of the secondary storage site.

公开(公告)号：US20240338125A1

公开(公告)日：2024-10-10

申请号：US18296832

申请日：2023-04-06

Applicant: NetApp, Inc.

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

IPC: G06F3/06

CPC classification number: G06F3/0617 ,  G06F3/0653 ,  G06F3/0683

Abstract: Systems and methods include negotiating a primary bias state for primary and secondary storage sites when a mediator is temporarily unavailable for a multi-site distributed storage system. In one example, a computer-implemented method comprises detecting, with the primary storage site having a primary storage cluster, a temporary loss of connectivity to a mediator or a failure of the mediator. The computer-implemented method includes negotiating the primary bias state and setting the primary bias state on a secondary storage cluster of the secondary storage site when the secondary storage cluster detects a temporary loss of connectivity to the mediator, determining whether the primary storage cluster receives a confirmation of the secondary storage cluster setting the primary bias state, and setting the primary bias state on the primary storage cluster when the primary storage cluster receives the confirmation.

公开(公告)号：US12105983B2

公开(公告)日：2024-10-01

申请号：US18459234

申请日：2023-08-31

Applicant: NetApp Inc.

Inventor： Akhil Kaushik ,  Anil Kumar Ponnapur ,  Aravind Srinivasa Raghavan ,  Manoj Kumar V Sundararajan

IPC: G06F3/06

CPC classification number: G06F3/065 ,  G06F3/061 ,  G06F3/0617 ,  G06F3/0619 ,  G06F3/0658 ,  G06F3/0659 ,  G06F3/067 ,  G06F3/0683

Abstract: One or more techniques and/or computing devices are provided for resilient replication of storage operations. For example, a first storage controller may host first storage having a replication relationship with second storage hosted by a second storage controller. To improve resiliency against transient network issues of a network between the storage controllers, the first storage controller may implement a queue and retry mechanism to retry replication operations not acknowledge back by the second storage controller within a threshold time. The second storage controller may maintain a cumulative sequence number of a latest replication operation performed in order, an operation response map of replication operations performed out of order, and an operation finder map identifying currently implemented replication operations, which may be used to process incoming replication operations. Single write semantics, write order consistency, and reduction of write amplification may be provided.

公开(公告)号：US12073091B2

公开(公告)日：2024-08-27

申请号：US18160371

申请日：2023-01-27

Applicant: NetApp Inc.

Inventor： Akhil Kaushik ,  Ripulkumar Hemantbhai Patel ,  Vrishali Dattatray Hajare ,  Andrew Eric Dunn ,  Rithin Kumar Shetty

IPC: G06F11/14 ,  G06F3/06 ,  G06F11/20

CPC classification number: G06F3/0619 ,  G06F3/065 ,  G06F3/0683 ,  G06F11/1451 ,  G06F11/1469 ,  G06F11/20 ,  G06F2201/805 ,  G06F2201/84

Abstract: One or more techniques and/or computing devices are provided for resynchronization. For example, a request may be received to create pseudo snapshots of a first consistency group, hosted by a first storage controller, and a second consistency group, hosted by a second storage controller, having a synchronous replication relationship with the first consistency group. Incoming client write requests are logged within an intercept tracking log at the first storage controller. After a first drain without hold of incoming write requests is performed, a first pseudo common snapshot of the second consistency group is created. After a second drain without hold of incoming write operations is performed, a second pseudo common snapshot of the first consistency group and the intercept tracking log is created. The pseudo snapshots and the intercept tracking log (e.g., indicating a delta between the pseudo snapshots) are used to resynchronize the first and second consistency groups.

公开(公告)号：US12019873B2

公开(公告)日：2024-06-25

申请号：US17875849

申请日：2022-07-28

Applicant: NetApp, Inc.

Inventor： Anoop Vijayan ,  Akhil Kaushik ,  Sohan Shetty ,  Dhruvil Shah

IPC: G06F3/06

CPC classification number: G06F3/0611 ,  G06F3/0614 ,  G06F3/0655 ,  G06F3/067

Abstract: Multi-site distributed storage systems and computer-implemented methods are described for improving a resumption time for processing of input/output (I/O) operations during an automatic unplanned failover (AUFO). A first storage cluster includes a first set of consistency groups (CGs) and a second storage cluster includes a second mirrored set of CGs. A computer-implemented method includes prefetching, with a user space of the second storage cluster, configuration information from a replicated database prior to starting the AUFO workflow, sending the configuration information to a kernel space of the second storage cluster on a per CG level while queuing the AUFO workflow, and determining if any in progress workflows conflict with the AUFO workflow.

公开(公告)号：US11995041B2

公开(公告)日：2024-05-28

申请号：US18148705

申请日：2022-12-30

Applicant: NetApp, Inc.

Inventor： Akhil Kaushik ,  Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Dhruvil Shah ,  Omprakash Khandelwal

IPC: G06F16/178 ,  G06F16/11

CPC classification number: G06F16/178 ,  G06F16/128

Abstract: Multi-site distributed storage systems and computer-implemented methods are described for improving a resumption time of input/output (I/O) operations during a common snapshot process for storage objects. A computer-implemented method comprises performing a baseline transfer from at least one storage object of a first storage node to at least one replicated storage object of a second storage node, starting the common snapshot process including stop processing of I/O operations, performing a snapshot create operation on the primary storage site for the at least one storage object of the first storage node, resuming processing of I/O operations, and assigning a new universal unique identifier (UUID) to the at least one storage object of the second storage node after resuming processing of I/O operations with the new UUID to identify when file system contents are different than the baseline transfer.

公开(公告)号：US20240168673A1

公开(公告)日：2024-05-23

申请号：US18429911

申请日：2024-02-01

Applicant: NetApp, Inc.

Inventor： Anoop Vijayan ,  Akhil Kaushik ,  Sohan Shetty ,  Dhruvil Shah

IPC: G06F3/06

CPC classification number: G06F3/065 ,  G06F3/0604 ,  G06F3/0629 ,  G06F3/0641 ,  G06F3/067

Abstract: Systems and methods are described for efficiently processing events related to a relationship between a primary copy of data at a primary storage system and a mirror copy of the data at a cross-site secondary storage system of a multi-site distributed storage system. According to an example, a mediator agent that is configured on both primary and secondary storage systems provides coordination and serialization for various events generated in the relationship. The multi-site distributed storage system performs actions based on the event processing such as performing a failover operation from the primary storage system to the secondary storage system or resynchronizing the relationship to ensure application protection and availability.

公开(公告)号：US20240160374A1

公开(公告)日：2024-05-16

申请号：US18421649

申请日：2024-01-24

Applicant: NetApp, Inc.

Inventor： Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Akhil Kaushik ,  Nagaraj Lalsangi

IPC: G06F3/06

CPC classification number: G06F3/065 ,  G06F3/0613 ,  G06F3/0619 ,  G06F3/0631 ,  G06F3/0653 ,  G06F3/0659 ,  G06F3/067

Abstract: In one embodiment, a method comprises maintaining state information regarding a data synchronous replication status for a storage object of a primary storage cluster and a replicated storage object of a secondary storage cluster. The method includes temporarily disallowing input/output (I/O) operations for the storage object when the storage object of the primary storage cluster has a failure, which causes an internal state as out of sync for the storage object while maintaining an external state as in sync for external entities. The method performs persistent inflight tracking and reconciliation of I/O operations with a first Op log of the primary storage cluster and a second Op log of the secondary storage cluster and performs a resynchronization between the storage object and the replicated storage object based on the persistent inflight tracking and reconciliation of I/O operations.

公开(公告)号：US20240126470A1

公开(公告)日：2024-04-18

申请号：US18448224

申请日：2023-08-11

Applicant: NetApp Inc.

Inventor： Michael Robin Eisler ,  Santosh Ananth Rao ,  Akhil Kaushik ,  Yuedong Mu

IPC: G06F3/06 ,  G06F11/20

CPC classification number: G06F3/065 ,  G06F3/0619 ,  G06F3/067 ,  G06F11/2058 ,  G06F11/2069 ,  G06F11/2071 ,  G06F11/2082 ,  G06F2201/84

Abstract: One or more techniques and/or computing devices are provided for synchronous replication. For example, synchronous replication relationships are established between a first storage object (e.g., a file, a logical unit number (LUN), a consistency group, etc.), hosted by a first storage controller, and a plurality of replication storage objects hosted by other storage controllers. In this way, a write operation to the first storage object is implemented in parallel upon the first storage object and the replication storage objects in a synchronous manner, such as using a zero-copy operation to reduce overhead otherwise introduced by performing copy operations. Reconciliation is performed in response to a failure so that the first storage object and the replication storage objects comprise consistent data. Failed write operations and replication write operations are retried, while enforcing a single write semantic. Dependent write order consistency is enforced for dependent write operations, such as overlapping write operations.

公开(公告)号：US11893261B2

公开(公告)日：2024-02-06

申请号：US17510788

申请日：2021-10-26

Applicant: NetApp, Inc.

Inventor： Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Akhil Kaushik ,  Nagaraj Lalsangi

IPC: G06F3/06

CPC classification number: G06F3/065 ,  G06F3/067 ,  G06F3/0613 ,  G06F3/0619 ,  G06F3/0631 ,  G06F3/0653 ,  G06F3/0659

Abstract: In one embodiment, a method comprises maintaining state information regarding a data synchronous replication status for a storage object of a primary storage cluster and a replicated storage object of a secondary storage cluster. The method includes temporarily disallowing input/output (I/O) operations for the storage object when the storage object of the primary storage cluster has a failure, which causes an internal state as out of sync for the storage object while maintaining an external state as in sync for external entities. The method performs persistent inflight tracking and reconciliation of I/O operations with a first Op log of the primary storage cluster and a second Op log of the secondary storage cluster and performs a resynchronization between the storage object and the replicated storage object based on the persistent inflight tracking and reconciliation of I/O operations.