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.

公开(公告)号：US20240012575A1

公开(公告)日：2024-01-11

申请号：US17861768

申请日：2022-07-11

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：US20230325361A1

公开(公告)日：2023-10-12

申请号：US18335710

申请日：2023-06-15

Applicant: NetApp Inc.

Inventor： Rithin Kumar Shetty ,  Akhil Kaushik ,  Nagender Somavarapu ,  Yuedong Mu ,  Pranab Patnaik

IPC: G06F16/178 ,  G06F16/188 ,  G06F11/14 ,  G06F11/20 ,  G06F9/455 ,  H04L67/1095

CPC classification number: G06F16/178 ,  G06F16/188 ,  G06F11/1484 ,  G06F11/2076 ,  G06F11/2082 ,  G06F9/45558 ,  G06F11/1464 ,  H04L67/1095 ,  G06F2009/45562 ,  G06F2009/45583 ,  G06F2201/84

Abstract: One or more techniques and/or computing devices are provided for replicating virtual machine disk clones. For example, a first storage controller, hosting first storage, may have a synchronous replication relationship with a second storage controller hosting second storage. A virtual machine, within the first storage, may be specified as having synchronous replication protection. Accordingly, virtual machine disk clones of a virtual machine disk of the virtual machine may be replicated from the first storage to the second storage. For example, virtual machine disk clones may be synchronous replicated, replicated by a resync process invoked by a hypervisor agent, and/or stored and replicated from a clone backup directory.

公开(公告)号：US11762814B2

公开(公告)日：2023-09-19

申请号：US17486027

申请日：2021-09-27

Applicant: NetApp Inc.

Inventor： Akhil Kaushik ,  Gaurav Verma

IPC: G06F7/00 ,  G06F16/178 ,  G06F9/54

CPC classification number: G06F16/178 ,  G06F9/54

Abstract: Techniques are provided for synchronous replication for synchronous mirror copy guarantee. A file system dependent technique for synchronous mirror copy guarantee is provided by overriding default behavior of a persistent fence so that the persistent fence is activated to block operations targeting a storage object having a synchronous replication relationship based upon the synchronous replication relationship being out of sync. The default behavior of the persistent fence is overridden to allow operations to be executed upon the storage object based upon the synchronous replication relationship being in sync. A file system independent technique for synchronous mirror copy guarantee is provided by intercepting operations before the operations are received by a file system. The operations are selectively forwarded to the file system or not based upon a state of a synchronous replication relationship.