公开(公告)号：US12197291B2

公开(公告)日：2025-01-14

申请号：US18160557

申请日：2023-01-27

Applicant: NetApp, Inc.

Inventor： Sohan Shetty ,  Akhil Kaushik

IPC: G06F11/14 ,  G06F3/06 ,  G06F11/20

Abstract: Multi-site distributed storage systems and computer-implemented methods are described for providing common snapshot retention and automatic fanout reconfiguration for an asynchronous leg after a failure event that causes a failover from a primary storage site to a secondary storage site. A computer-implemented method comprises providing an asynchronous replication relationship with an asynchronous update schedule from one or more storage objects of the first storage node to one or more replicated storage objects of the third storage node, creating a snapshot copy of the one or more storage objects of the first storage node, transferring the snapshot copy to the third storage node based on an asynchronous mirror policy, and intercepting the snapshot create operation on the primary storage site and transferring the snapshot copy to the second storage node to provide a common snapshot between the second storage node and the third storage node.

公开(公告)号：US20240385995A1

公开(公告)日：2024-11-21

申请号：US18787654

申请日：2024-07-29

Applicant: NetApp, Inc.

Inventor： Murali Subramanian ,  Sohan Shetty ,  Rakesh Bhargava ,  Akhil Kaushik

IPC: G06F16/178 ,  G06F3/06 ,  G06F11/20 ,  G06F16/172 ,  G06F16/23

Abstract: Systems and methods for reducing delays between the time at which a need for a resynchronization of data replication between a volume of a local CG and its peer volume of a remote CG is detected and the time at which the resynchronization is triggered (Reseed Time Period) are provided. According to an example, information indicative of the direction of data replication between the volume and the peer volume is maintained within a cache of a node. Responsive to a disruptive operation (e.g., relocation of the volume from a first node to a second node), the Reseed Time Period is lessened by proactively adding a passive cache entry to a cache within the second node at the time the CG relationship is created when the second node represents an HA partner of the first node and prior to the volume coming online when the second node represents a non-HA partner.

公开(公告)号：US20240338145A1

公开(公告)日：2024-10-10

申请号：US18296834

申请日：2023-04-06

Applicant: NetApp, Inc.

Inventor： Sohan Shetty ,  Anoop Vijayan ,  Akhil Kaushik ,  Rohit Chaudhary

IPC: G06F3/06

CPC classification number: G06F3/0655 ,  G06F3/0604 ,  G06F3/067

Abstract: According to an example, a computer-implemented method comprises initiating a first process for atomically setting the primary bias state with a first node of a primary storage cluster of a multi-site distributed storage system due to a temporary loss of connectivity to a mediator or a temporary mediator failure, releasing an atomic lock for the first process on the first node of the primary storage cluster, sending the first process and an associated first generation indicator to a first node of a secondary storage cluster of the multi-site distributed storage system to handle the first process for setting the primary bias state, and initiating a second process for atomically clearing a primary bias state with the first node or any node of the primary storage cluster based on detecting a connection to the mediator or detecting that the mediator is available.

公开(公告)号：US20240329843A1

公开(公告)日：2024-10-03

申请号：US18672604

申请日：2024-05-23

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：US12099467B2

公开(公告)日：2024-09-24

申请号：US18333627

申请日：2023-06-13

Applicant: NetApp, Inc.

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

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

CPC classification number: G06F16/128 ,  G06F11/1448 ,  G06F11/1464 ,  G06F11/1469 ,  G06F16/13 ,  G06F2201/805 ,  G06F2201/84

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：US12050558B2

公开(公告)日：2024-07-30

申请号：US18448325

申请日：2023-08-11

Applicant: NetApp, Inc.

Inventor： Murali Subramanian ,  Sohan Shetty ,  Rakesh Bhargava ,  Akhil Kaushik

IPC: G06F16/17 ,  G06F3/06 ,  G06F11/20 ,  G06F16/172 ,  G06F16/178 ,  G06F16/23

CPC classification number: G06F16/178 ,  G06F3/0614 ,  G06F3/065 ,  G06F16/172 ,  G06F16/2365 ,  G06F11/2069 ,  G06F11/2092

Abstract: Systems and methods for reducing delays between the time at which a need for a resynchronization of data replication between a volume of a local CG and its peer volume of a remote CG is detected and the time at which the resynchronization is triggered (Reseed Time Period) are provided. According to an example, information indicative of the direction of data replication between the volume and the peer volume is maintained within a cache of a node. Responsive to a disruptive operation (e.g., relocation of the volume from a first node to a second node), the Reseed Time Period is lessened by proactively adding a passive cache entry to a cache within the second node at the time the CG relationship is created when the second node represents an HA partner of the first node and prior to the volume coming online when the second node represents a non-HA partner.

公开(公告)号：US11941267B2

公开(公告)日：2024-03-26

申请号：US18360133

申请日：2023-07-27

Applicant: NetApp, Inc.

Inventor： Arul Valan ,  Anoop Vijayan ,  Akhil Kaushik

IPC: G06F3/00 ,  G06F3/06

CPC classification number: G06F3/0631 ,  G06F3/0604 ,  G06F3/067

Abstract: Systems and methods for making a cross-site storage solution resilient towards mediator unavailability are provided. According to one embodiment, a stretched storage system is operable to bring a mediator associated with a primary and secondary distributed storage system back into the role of an arbitrator for peered consistency groups (CGs). A mediator reseed status indicator is maintained for multiple CGs to identify when the mediator's status information for a CG is stale. When the mediator becomes available and a local CG is identified as the subject of a mediator reseed process, the master node of the primary that hosts a master copy of a dataset for the local CG performs the reseed process, including: (i) causing relationship status information for the local CG to be updated on the mediator to the current state maintained by the primary; and (ii) resetting the mediator reseed status indicator.

公开(公告)号：US11907562B2

公开(公告)日：2024-02-20

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：US20240036997A1

公开(公告)日：2024-02-01

申请号：US17875814

申请日：2022-07-28

Applicant: NetApp, Inc.

Inventor： Anoop Vijayan ,  Akhil Kaushik ,  Dhruvil Shah

IPC: G06F11/20 ,  G06F11/07

CPC classification number: G06F11/2025 ,  G06F11/0727 ,  G06F11/0772 ,  G06F11/0757

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 monitoring, with a second cluster, heartbeat information received at ultra-short time intervals from a first connection of one or more storage objects of the first cluster, determining, with the second cluster, whether the heartbeat information from the first connection is received during an ultra-short time interval, and intelligently routing heartbeat information from the one or more storage objects of the first cluster from the first connection to a second connection when the heartbeat information from the first connection is not received during the ultra-short time interval.

公开(公告)号：US11836155B2

公开(公告)日：2023-12-05

申请号：US17221043

申请日：2021-04-02

Applicant: NetApp Inc.

Inventor： Akhil Kaushik ,  Balaji Ramani

IPC: G06F16/00 ,  G06F16/27 ,  G06F16/11 ,  G06F11/14 ,  G06F16/176

CPC classification number: G06F16/275 ,  G06F11/1464 ,  G06F11/1466 ,  G06F16/119 ,  G06F16/128 ,  G06F16/1774 ,  G06F2201/825 ,  G06F2201/835

Abstract: Techniques are provided for synchronous replication based cutover. An asynchronous replication process is executed to perform asynchronous incremental transfers of data of a storage object from a first computing environment to a replicated storage object at a second computing environment until a cutover criteria is met. A synchronous replication process is executed to synchronously replicate operations, targeting the storage object, to the replicated storage object based upon the cutover criteria being met. A cutover is performed to direct operations from targeting the storage object to targeting the replicated storage object based upon the synchronous replication process reaching a steady state of synchronous replication for sub-objects of the storage object, where operations are committed to both the storage object and the replicated storage object.