公开(公告)号：US11132339B2

公开(公告)日：2021-09-28

申请号：US16269838

申请日：2019-02-07

Applicant: NetApp Inc.

Inventor： Akhil Kaushik ,  Gaurav Verma

IPC: G06F7/00 ,  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.

公开(公告)号：US10824589B2

公开(公告)日：2020-11-03

申请号：US15338219

申请日：2016-10-28

Applicant: NetApp, Inc.

Inventor： Sharad Jain ,  Hrishikesh Ashok Tapaswi ,  Ling Zheng ,  Onkar Bhat ,  Akhil Kaushik

IPC: G06F16/00 ,  G06F16/11 ,  G06F16/13 ,  G06F11/14

Abstract: A storage appliance arranges snapshot data and snapshot metadata into different structures, and arranges the snapshot metadata to facilitate efficient snapshot manipulation, which may be for snapshot management or snapshot restore. The storage appliance receives snapshots according to a forever incremental configuration and arranges snapshot metadata into different types of records. The storage appliance stores these records in key-value stores maintained for each defined data collection (e.g., volume). The storage appliance arranges the snapshot metadata into records for inode information, records for directory information, and records that map source descriptors of data blocks to snapshot file descriptors. The storage appliance uses a locally generated snapshot identifier as a key prefix for the records to conform to a sort constrain of the key-value store, which allows the efficiency of the key-value store to be leveraged. The snapshot metadata arrangement facilitates efficient snapshot restore, file restore, and snapshot reclamation.

公开(公告)号：US20200073855A1

公开(公告)日：2020-03-05

申请号：US16679545

申请日：2019-11-11

Applicant: NetApp Inc.

Inventor： Devang Kundanlal Shah ,  Dipankar Roy ,  Krishnaveni Budati ,  Kai Tan ,  Pranab Patnaik ,  Akhil Kaushik

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

Abstract: One or more techniques and/or computing devices are provided for managing an arbitrary set of storage items using a granset. For example, a storage controller may host a plurality of storage items and/or logical unit numbers (LUNs). A subset of the storage items are grouped into a consistency group. A granset is created for tracking, managing, and/or providing access to the storage items within the consistency group. For example, the granset comprises application programming interfaces (APIs) and/or properties used to provide certain levels of access to the storage items (e.g., read access, write access, no access), redirect operations to access either data of an active file system or to a snapshot, fence certain operations (e.g., rename and delete operations), and/or other properties that apply to each storage item within the consistency group. Thus, the granset provides a persistent on-disk layout used to manage an arbitrary set of storage items.

公开(公告)号：US09917896B2

公开(公告)日：2018-03-13

申请号：US14953048

申请日：2015-11-27

Applicant: NetApp Inc.

Inventor： Paul Anthony Powell ,  Akhil Kaushik ,  Srikumar Natarajan ,  Ching-Yuk Paul Ngan

IPC: G06F12/00 ,  H04L29/08 ,  G06F17/30 ,  G06F11/20

CPC classification number: H04L67/1095 ,  G06F3/0614 ,  G06F3/065 ,  G06F3/067 ,  G06F11/2064 ,  G06F11/2069 ,  G06F17/30174 ,  G06F17/30215 ,  G06F2201/805 ,  H04L67/1097

Abstract: One or more techniques and/or computing devices are provided for implementing synchronous replication. For example, a synchronous replication relationship may be established between a first storage controller hosting local storage and a second storage controller hosting remote storage (e.g., replication may be specified at a file, logical unit number (LUN), or any other level of granularity). Data operations and offloaded operations may be implemented in parallel upon the local storage and the remote storage. Error handling operations may be implemented upon the local storage and implement in parallel as a best effort on the remote storage, and a reconciliation may be performed to identify any data divergence from the best effort parallel implementation. Storage area network (SAN) operations may be implemented upon the local storage, and upon local completion may be remotely implemented upon the remote storage.

公开(公告)号：US09727262B2

公开(公告)日：2017-08-08

申请号：US14980345

申请日：2015-12-28

Applicant: NetApp Inc.

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

IPC: G06F11/00 ,  G06F3/06 ,  G06F11/14

CPC classification number: G06F3/0619 ,  G06F3/065 ,  G06F3/0683 ,  G06F11/1451 ,  G06F11/1469 ,  G06F11/1471 ,  G06F11/2064 ,  G06F11/2076 ,  G06F11/2082 ,  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：US20160026703A1

公开(公告)日：2016-01-28

申请号：US14340430

申请日：2014-07-24

Applicant: NetApp, Inc.

Inventor： Vikas Yadav ,  Rajesh Desai ,  Akhil Kaushik

IPC: G06F17/30

Abstract: A system and method for enabling data replication is described. A set of protocol messages can be associated with a set of corresponding set of requests. The associated set of protocol messages can be provided to each of a source storage system and a destination storage system. The source storage system and the destination storage system can be heterogeneous storage systems that implement different types of file systems or file layouts. The source storage system and the destination storage system are enabled to perform a data replication process, in which at least a set of data is to be replicated from the source storage system to the destination storage system, using at least a protocol message from the associated set of protocol messages. The protocol message can correspond to a request for a list of snapshots stored at the source storage system.

Abstract translation: 描述了用于启用数据复制的系统和方法。 一组协议消息可以与一组相应的请求相关联。 可以将关联的一组协议消息提供给源存储系统和目的地存储系统中的每一个。 源存储系统和目标存储系统可以是实现不同类型的文件系统或文件布局的异构存储系统。 源存储系统和目的地存储系统能够执行数据复制过程，其中至少一组数据将从源存储系统复制到目的地存储系统，至少使用来自相关联的协议消息的协议消息 一组协议消息。 协议消息可以对应于存储在源存储系统的快照的列表的请求。

公开(公告)号：US12282678B2

公开(公告)日：2025-04-22

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

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：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.