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公开(公告)号：US10761768B1
公开(公告)日：2020-09-01
申请号：US16288506
申请日：2019-02-28
Applicant: NetApp Inc.
Inventor： Akhil Kaushik , Anoop Chakkalakkal Vijayan , Krishna Murthy Chandraiah setty Narasingarayanapeta , Shrey Sengar
IPC: G06F13/00 , G06F3/06 , G06F16/901
Abstract: Techniques are provided for handling misaligned holes and writes beyond end of files during a quick reconciliation process. During quick reconciliation, a read operation is performed to read data from a first storage object and is replicated to a second storage object. If the data read from the first storage object comprises misaligned holes, then a different range of data is read from the first storage object so that aligned holes are read and replicated to the second storage object. If the read operation targets a region beyond an end of the first storage object, then the second storage object is truncated to a size of the first storage object.
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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
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.
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公开(公告)号：US20200081625A1
公开(公告)日：2020-03-12
申请号：US16683427
申请日：2019-11-14
Applicant: NetApp Inc.
Inventor： Michael Robin Eisler , Santosh Ananth Rao , Akhil Kaushik , Yuedong Mu
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.
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公开(公告)号：US20180139279A1
公开(公告)日：2018-05-17
申请号：US15850754
申请日：2017-12-21
Applicant: NetApp Inc.
Inventor： Paul Anthony Powell , Akhil Kaushik , Srikumar Natarajan , Ching-Yuk Paul Ngan
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.
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公开(公告)号：US20170316029A1
公开(公告)日：2017-11-02
申请号：US15140992
申请日：2016-04-28
Applicant: NetApp Inc.
Inventor： Devang Kundanlal Shah , Dipankar Roy , Krishnaveni Budati , Kai Tan , Pranab Patnaik , Akhil Kaushik
IPC: G06F17/30
CPC classification number: G06F16/178 , G06F3/0605 , G06F3/065 , G06F3/0665 , G06F3/067 , G06F16/122 , G06F16/128
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.
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Patent Agency Ranking
公开(公告)号：US20170220258A1
公开(公告)日：2017-08-03
申请号：US15008724
申请日：2016-01-28
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.
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公开(公告)号：US20170155713A1
公开(公告)日：2017-06-01
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
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.
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公开(公告)号：US20250053488A1
公开(公告)日：2025-02-13
申请号：US18928972
申请日：2024-10-28
Applicant: NetApp, Inc.
Inventor： Anoop Vijayan , Akhil Kaushik , Sohan Shetty , Dhruvil Shah
IPC: G06F11/20
Abstract: Multi-site distributed storage systems and computer-implemented methods are described for improving a resumption time of input/output (I/O) operations during an automatic unplanned failover (AUFO). A computer-implemented method includes determining, with a second storage cluster, whether heartbeat information from one or more storage objects of a CG of a first set of CGs is received during a time period, determining an out of sync state for a data replication relationship between the CG of the first set of CGs and a mirrored CG of a second set of CGs when the heartbeat information is not received during the time period and sending a single bulk role change call with a cluster identifier from the second cluster to an external mediator to provide a role change from follower to leader in the second set of CGs.
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公开(公告)号：US12206734B2
公开(公告)日：2025-01-21
申请号：US17567182
申请日：2022-01-03
Applicant: NetApp Inc.
Inventor： Paul Anthony Powell , Akhil Kaushik , Srikumar Natarajan , Ching-Yuk Paul Ngan
IPC: G06F3/00 , G06F3/06 , G06F11/20 , G06F16/178 , G06F16/182 , H04L67/1095 , 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.
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公开(公告)号：US12204416B2
公开(公告)日：2025-01-21
申请号：US18148696
申请日：2022-12-30
Applicant: NetApp, Inc.
Inventor： Akhil Kaushik , Dhruvil Shah , Arun Kumar Selvam
IPC: G06F11/00 , G06F3/06 , G06F11/14 , G06F16/11 , G06F16/178
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 procedure for storage objects. A computer-implemented method includes initiating a snapshot multi create operation to selectively form a batch of first and second synchronous replicated datasets that belong to a first group of storage disks at the primary storage site and corresponding second group of storage disks at the secondary storage site, performing a batch snapshot create operation on the primary storage site by executing snapshots of storage objects on the primary storage site of the batch of first and second synchronous replicated datasets in parallel multiple threads to effectively utilize processing resources on the primary storage site, and initiating an independent workflow and state machine for each storage object of the batch of first and second synchronous replicated datasets.
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