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    Method and apparatus to neutralize replication error and retain primary and secondary synchronization during synchronous replication
    1.
    发明授权
    Method and apparatus to neutralize replication error and retain primary and secondary synchronization during synchronous replication 有权

    公开(公告)号：US11138061B2

    公开(公告)日：2021-10-05

    申请号：US16288469

    申请日：2019-02-28

    Applicant: NetApp Inc.

    Inventor： Akhil Kaushik ,  Anoop Chakkalakkal Vijayan

    IPC: G06F11/07 ,  G06F16/27 ,  G06F11/16

    Abstract: Techniques are provided for neutralizing replication errors. An operation is executed upon a first storage object and is replicated as a replicated operation for execution upon a second storage object. A first error may be received for the replicated operation. Instead of transitioning to an out of sync state and aborting the operation, a wait is performed until a result of the attempted execution of the operation is received. If the first error is the same as a second error returned for the operation, then the operation and replicated operation are considered successful and a synchronous replication relationship is kept in sync. If the first error and the second error are different errors, then an error response is returned for the operation and the synchronous replication relationship is transitioned to out of sync.

    NON-DISRUPTIVE TRANSITION TO SYNCHRONOUS REPLICATION STATE
    4.
    发明申请
    NON-DISRUPTIVE TRANSITION TO SYNCHRONOUS REPLICATION STATE 审中-公开

    公开(公告)号：US20200285655A1

    公开(公告)日：2020-09-10

    申请号：US16293807

    申请日：2019-03-06

    Applicant: NetApp Inc.

    Inventor： Akhil Kaushik ,  Anoop Chakkalakkal Vijayan ,  Preetham Kudgi Shenoy

    IPC: G06F16/27

    Abstract: Techniques are provided for transitioning a first storage object and a second storage object from an asynchronous replication state to a synchronous replication state. Metadata operations are logged into a metadata log. Dirty data, modified by data operations executed upon the first storage object, are tracked using a dirty region log. Metadata operations are replicated from the metadata log to the second storage object during a metadata drain phase. During the metadata drain phase, incoming operations are logged into the metadata log when the metadata log has a non-zero size, otherwise, the metadata operations are replicated to the second storage object. After the metadata drain phase, a data drain phase is performed using the dirty region log.

    Dynamic recycling algorithm to handle overlapping writes during synchronous replication of application workloads with large number of files
    6.
    发明授权
    Dynamic recycling algorithm to handle overlapping writes during synchronous replication of application workloads with large number of files 有权

    公开(公告)号：US10725691B1

    公开(公告)日：2020-07-28

    申请号：US16288437

    申请日：2019-02-28

    Applicant: NetApp Inc.

    Inventor： Akhil Kaushik ,  Anoop Chakkalakkal Vijayan

    IPC: G06F13/00 ,  G06F3/06

    Abstract: Techniques are provided for overlapping write handling. Overlapping write managers are used to maintain the order that write operations are executed at a first computing environment and replicated to a second computing environment. Overlapping write managers are pre-allocated as available for managing overlapping write operations. A mapping is used to track what overlapping write managers are currently allocated for particular file handles of files. Thus, if an incoming write operation targets a file handle of an already allocated overlapping write manager, then that overlapping write manager is used to execute and replicate the incoming write operation so that the order of execution of overlapping writes by the second computing environment is the same as at the first computing environment. If there is no allocated overlapping write manager for the file handle, then a new overlapping write manager is allocated and utilized.

    Configuration update management
    7.
    发明授权
    Configuration update management 有权

    公开(公告)号：US10698607B2

    公开(公告)日：2020-06-30

    申请号：US14715745

    申请日：2015-05-19

    Applicant: NetApp Inc.

    Inventor： Chinmoy Dey ,  Anoop Chakkalakkal Vijayan ,  Prasad Srinivas

    IPC: G06F3/06 ,  G06F9/455

    Abstract: One or more techniques and/or systems are provided for managing configuration updates used to replicate configuration of a primary storage virtual machine to a partner storage virtual machine. For example, the partner storage virtual machine may be configured to provide failover operation in place of the primary storage virtual machine in the event the primary storage virtual machine fails. Configuration updates are queued and replayed on the partner storage virtual machine to replicate objects of the primary storage virtual machine to the partner storage virtual machine (e.g., replay of create, modify, or delete object commands for synchronizing volumes, logical unit numbers, and/or other configuration objects of the primary storage virtual machine to the partner storage virtual machine). Configuration updates may be retained, modified, or discarded/removed based upon consolidation rules, which improves computing resource utilization by consolidating configuration updates and/or removing stale configuration updates while achieving a similar replication consistency result.

    Dynamic recycling algorithm to handle overlapping writes during synchronous replication of application workloads with large number of files
    9.
    发明授权
    Dynamic recycling algorithm to handle overlapping writes during synchronous replication of application workloads with large number of files 有权

    公开(公告)号：US11036423B2

    公开(公告)日：2021-06-15

    申请号：US16903518

    申请日：2020-06-17

    Applicant: NetApp Inc.

    Inventor： Akhil Kaushik ,  Anoop Chakkalakkal Vijayan

    IPC: G06F13/00 ,  G06F3/06

    Abstract: Techniques are provided for overlapping write handling. Overlapping write managers are used to maintain the order that write operations are executed at a first computing environment and replicated to a second computing environment. Overlapping write managers are pre-allocated as available for managing overlapping write operations. A mapping is used to track what overlapping write managers are currently allocated for particular file handles of files. Thus, if an incoming write operation targets a file handle of an already allocated overlapping write manager, then that overlapping write manager is used to execute and replicate the incoming write operation so that the order of execution of overlapping writes by the second computing environment is the same as at the first computing environment. If there is no allocated overlapping write manager for the file handle, then a new overlapping write manager is allocated and utilized.

    DEPENDENCY AWARE PARALLEL SPLITTING OF OPERATIONS
    10.
    发明申请
    DEPENDENCY AWARE PARALLEL SPLITTING OF OPERATIONS 审中-公开

    公开(公告)号：US20200372046A1

    公开(公告)日：2020-11-26

    申请号：US16686686

    申请日：2019-11-18

    Applicant: NetApp Inc.

    Inventor： Anoop Chakkalakkal Vijayan ,  Shrey Sengar

    IPC: G06F16/27

    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.

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