公开(公告)号：US20230081436A1

公开(公告)日：2023-03-16

申请号：US17990769

申请日：2022-11-21

Applicant: NetApp Inc.

Inventor： Anoop Chakkalakkal Vijayan ,  Shrey Sengar ,  Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Akhil Kaushik

IPC: G06F16/27 ,  G06F16/23

Abstract: Techniques are provided for dependency aware parallel splitting of operations. For example, a count of pending data operations being executed by a first node and replicated in parallel to a second node are tracked. A metadata operation is executed at the first node based upon the count being less than a threshold (e.g., the count being zero). A first list of affected inodes modified by the metadata operation is identified. A dependency of the metadata operation with respect to pending metadata operations replicated to the second node is determined. The metadata operation is dispatched to the second node based upon the dependency indicating that the metadata operation is independent of the pending metadata operations.

公开(公告)号：US20250165177A1

公开(公告)日：2025-05-22

申请号：US19034412

申请日：2025-01-22

Applicant: NetApp, Inc.

Inventor： Vishal Thakur ,  Akhil Kaushik ,  Anoop Vijayan ,  Krishna Murthy Chandraiah Setty Narasingarayanapeta

IPC: G06F3/06

Abstract: In one embodiment, a computer-implemented method comprises establishing bi-directional synchronous replication between one or more storage objects of a primary storage site and one or more storage objects of a secondary storage site with each storage site having read/write access while maintaining zero recovery point objective (RPO) and Zero recovery time objective (RTO), initiating a resynchronization process due to a loss of the bi-directional synchronous replication between the one or more storage objects and the one or more storage objects, and performing the resynchronization process based on using inflight tracking replay and reconciliation between a first Op log metafile of the primary storage site and a second Op log metafile of the secondary storage site.

公开(公告)号：US20240296100A1

公开(公告)日：2024-09-05

申请号：US18646358

申请日：2024-04-25

Applicant: NetApp, Inc.

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

IPC: G06F11/14 ,  G06F3/06 ,  G06F16/11 ,  G06F16/178

CPC classification number: G06F11/1466 ,  G06F3/0611 ,  G06F3/064 ,  G06F3/067 ,  G06F11/1448 ,  G06F11/1451 ,  G06F16/128 ,  G06F16/178 ,  G06F2201/84

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：US20240168671A1

公开(公告)日：2024-05-23

申请号：US18424244

申请日：2024-01-26

Applicant: NetApp, Inc.

Inventor： Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Akhil Kaushik

IPC: G06F3/06

CPC classification number: G06F3/0647 ,  G06F3/0604 ,  G06F3/0679

Abstract: In one embodiment, a method comprises maintaining state information regarding a data replication status for a storage object of the storage node of a primary storage cluster with the storage object being replicated to a replicated storage object of a secondary storage cluster, temporarily disallowing input/output (I/O) operations when the storage object has a connection loss or failure. The method further includes initiating a resynchronization between the storage object and the replicated storage object including initiating asynchronous persistent inflight tracking and replay of any missing I/O operations that are missing from one of a first Op log of the primary storage cluster and a second Op log of the secondary storage cluster, and allowing new I/O operations to be handled with the storage object of the primary storage cluster without waiting for completion of the asynchronous persistent inflight tracking and replay at the secondary storage cluster.

公开(公告)号：US11907261B2

公开(公告)日：2024-02-20

申请号：US17503945

申请日：2021-10-18

Applicant: NetApp Inc.

Inventor： Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Rakesh Bhargava M. R. ,  Harsha Handral Sridhara

IPC: G06F16/00 ,  G06F16/27 ,  G06F16/23 ,  G06F3/06

CPC classification number: G06F16/275 ,  G06F3/065 ,  G06F3/067 ,  G06F3/0619 ,  G06F16/2322

Abstract: Techniques are provided for timestamp consistency. An operation targeting a first storage object having a synchronous replication relationship with a second storage object is intercepted. A timestamp is assigned to the operation. A replication operation is created as a replication of the operation. The same timestamp is assigned to the replication operation. The operation is implemented upon the first storage object and the replication operation is implemented upon the second storage object.

公开(公告)号：US20220357855A1

公开(公告)日：2022-11-10

申请号：US17510795

申请日：2021-10-26

Applicant: NetApp, Inc.

Inventor： Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Preetham Shenoy ,  Divya Kathiresan ,  Rakesh Bhargava

IPC: G06F3/06

Abstract: Systems and methods are described for performing persistent inflight tracking of operations (Ops) within a cross-site storage solution. According to one embodiment, a method comprises maintaining state information regarding a data synchronous replication status for a first storage object of a primary storage cluster and a second storage object of a secondary storage cluster. The state information facilitates automatic triggering of resynchronization for data replication between the first storage object and the second storage object. The method includes performing persistent inflight tracking of I/O operations with a first Op log of the primary storage cluster and a second Op log of the secondary storage cluster, establishing and comparing Op ranges for the first and second Op logs, and determining a relation between the Op range of the first Op log and the Op range of the second Op log to prevent divergence of Ops in the first and second Op logs and to support parallel split of the Ops.

公开(公告)号：US11449260B2

公开(公告)日：2022-09-20

申请号：US17106240

申请日：2020-11-30

Applicant: NetApp Inc.

Inventor： Krishna Murthy Chandraiah Setty Narasingarayanapeta ,  Rakesh Bhargava M. R.

IPC: G06F12/00 ,  G06F3/06

Abstract: Techniques are provided for persistent hole reservation. For example, hole reservation flags of operations targeting a first storage object of a first node are replicated into replication operations targeting a second storage object of a second node during a transition operation to transition the first storage object and the second storage object from an asynchronous replication state to a synchronous replication state. In another example, the second storage object is grown to a size of a replication punch hole operation that failed due to targeting a file block number greater than an end of size of the second storage object.

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：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：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.