Patents by Inventor Hrishikesh Keremane

Hrishikesh Keremane has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10719419
    Abstract: One or more techniques and/or computing devices are provided for communicating storage controller failures utilizing service processor traps. A first storage controller, of a first storage cluster, has a disaster recovery relationship with a second storage controller of a second storage cluster. The first storage controller comprise a first service processor configured to monitor health of the first storage controller. Responsive to identifying a failure of the first storage controller, the first service processor uses stored communication configuration of a second service processor of the second storage controller to send a service processor trap to the second service processor. In this way, the second service processor initiates a switchover operation by the second storage controller to provide clients with failover access to data previously available through the first storage controller before the failure.
    Type: Grant
    Filed: May 24, 2018
    Date of Patent: July 21, 2020
    Assignee: NetApp Inc.
    Inventors: Hrishikesh Keremane, Vijay Singh, David Andrew Allender
  • Publication number: 20200081807
    Abstract: One or more techniques and/or computing devices are provided for automatic switchover implementation. For example, a first storage controller, of a first storage cluster, may have a disaster recovery relationship with a second storage controller of a second storage cluster. In the event the first storage controller fails, the second storage controller may automatically switchover operation from the first storage controller to the second storage controller for providing clients with failover access to data previously accessible to the clients through the first storage controller. The second storage controller may detect, cross-cluster, a failure of the first storage controller utilizing remote direct memory access (RDMA) read operations to access heartbeat information, heartbeat information stored within a disk mailbox, and/or service processor traps.
    Type: Application
    Filed: November 13, 2019
    Publication date: March 12, 2020
    Inventors: Hrishikesh Keremane, Vijay Singh
  • Patent number: 10521316
    Abstract: A system and method for handling multi-node failures in a disaster recovery cluster is provided. In the event of an error condition, a switchover operation occurs from the failed nodes to one or more surviving nodes. Data stored in non-volatile random access memory is recovered by the surviving nodes to bring storage objects, e.g., disks, aggregates and/or volumes into a consistent state.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: December 31, 2019
    Assignee: NetApp Inc.
    Inventors: Vaiapuri Ramasubramaniam, Harihara Kadayam, Parag Sarfare, Yong Eun Cho, Chaitanya Patel, Hrishikesh Keremane, Prachi Deshmukh
  • Patent number: 10503619
    Abstract: One or more techniques and/or computing devices are provided for automatic switchover implementation. For example, a first storage controller, of a first storage cluster, may have a disaster recovery relationship with a second storage controller of a second storage cluster. In the event the first storage controller fails, the second storage controller may automatically switchover operation from the first storage controller to the second storage controller for providing clients with failover access to data previously accessible to the clients through the first storage controller. The second storage controller may detect, cross-cluster, a failure of the first storage controller utilizing remote direct memory access (RDMA) read operations to access heartbeat information, heartbeat information stored within a disk mailbox, and/or service processor traps.
    Type: Grant
    Filed: November 22, 2017
    Date of Patent: December 10, 2019
    Assignee: NetApp Inc.
    Inventors: Hrishikesh Keremane, Vijay Singh
  • Publication number: 20190213093
    Abstract: During a storage redundancy giveback from a first node to a second node following a storage redundancy takeover from the second node by the first node, the second node is initialized in part by receiving a node identification indicator from the second node. The node identification indicator is included in a node advertisement message sent by the second node during a giveback wait phase of the storage redundancy giveback. The node identification indicator includes an intra-cluster node connectivity identifier that is used by the first node to determine whether the second node is an intra-cluster takeover partner. In response to determining that the second node is an intra-cluster takeover partner, the first node completes the giveback of storage resources to the second node.
    Type: Application
    Filed: March 14, 2019
    Publication date: July 11, 2019
    Inventors: Amit V. Panara, Chaitanya V. Patel, Hrishikesh Keremane, Pankti Vinay Majmudar, Santhosh Unnikrishnan, Sravan Kumar Elpula, Susan M. Coatney
  • Patent number: 10282262
    Abstract: During a storage redundancy giveback from a first node to a second node following a storage redundancy takeover from the second node by the first node, the second node is initialized in part by receiving a node identification indicator from the second node. The node identification indicator is included in a node advertisement message sent by the second node during a giveback wait phase of the storage redundancy giveback. The node identification indicator includes an intra-cluster node connectivity identifier that is used by the first node to determine whether the second node is an intra-cluster takeover partner. In response to determining that the second node is an intra-cluster takeover partner, the first node completes the giveback of storage resources to the second node.
    Type: Grant
    Filed: November 28, 2016
    Date of Patent: May 7, 2019
    Assignee: NetApp Inc.
    Inventors: Amit V. Panara, Chaitanya V. Patel, Hrishikesh Keremane, Pankti Vinay Majmudar, Santhosh Unnikrishnan, Sravan Kumar Elpula, Susan M. Coatney
  • Publication number: 20180267874
    Abstract: One or more techniques and/or computing devices are provided for communicating storage controller failures utilizing service processor traps. A first storage controller, of a first storage cluster, has a disaster recovery relationship with a second storage controller of a second storage cluster. The first storage controller comprise a first service processor configured to monitor health of the first storage controller. Responsive to identifying a failure of the first storage controller, the first service processor uses stored communication configuration of a second service processor of the second storage controller to send a service processor trap to the second service processor. In this way, the second service processor initiates a switchover operation by the second storage controller to provide clients with failover access to data previously available through the first storage controller before the failure.
    Type: Application
    Filed: May 24, 2018
    Publication date: September 20, 2018
    Inventors: Hrishikesh Keremane, Vijay Singh, David Andrew Allender
  • Patent number: 9996436
    Abstract: One or more techniques and/or computing devices are provided for communicating storage controller failures utilizing service processor traps. A first storage controller, of a first storage cluster, has a disaster recovery relationship with a second storage controller of a second storage cluster. The first storage controller comprise a first service processor configured to monitor health of the first storage controller. Responsive to identifying a failure of the first storage controller, the first service processor uses stored communication configuration of a second service processor of the second storage controller to send a service processor trap to the second service processor. In this way, the second service processor initiates a switchover operation by the second storage controller to provide clients with failover access to data previously available through the first storage controller before the failure.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: June 12, 2018
    Assignee: NetApp Inc.
    Inventors: Hrishikesh Keremane, Vijay Singh, David Andrew Allender
  • Patent number: 9990262
    Abstract: One or more techniques and/or systems are provided for dynamic mirroring. A first storage node and the second storage node within a first storage cluster may locally mirror data between one another based upon a local failover partnership. The first storage node and a third storage node within a second storage cluster may remotely mirror data between one another based upon a primary disaster recovery partnership. If the third storage node fails, then the first storage node may remotely mirror data to a fourth storage node within the second storage cluster based upon an auxiliary disaster recovery partnership. In this way, data loss protection for the first storage node may be improved, such that the fourth storage node provide clients with access to mirrored data from the first storage node in the event the second storage node and/or the third storage node are unavailable when the first storage node fails.
    Type: Grant
    Filed: September 1, 2017
    Date of Patent: June 5, 2018
    Assignee: NetApp Inc.
    Inventors: Hrishikesh Keremane, Iswarya Ayyappan, Allen Rintoul Keeranchira Joseph, Vaiapuri Ramasubramaniam, Jitendra Pratap Singh Chauhan
  • Patent number: 9952951
    Abstract: One or more techniques and/or computing devices are provided for preserving coredump data. A first storage controller, of a first storage cluster, may have a disaster recovery relationship with a second storage controller of a second storage cluster. When the first storage controller fails, the first storage controller performs a coredump process to dump memory contents of the first storage controller into a storage device. During implementation of the coredump process, the first storage controller stores a storage device identifier of the storage device into a disk mailbox. Upon detecting the failure, the second storage controller reads the storage device identifier from the disk mailbox. The second storage controller performs a switchover operation to change ownership of storage devices, but excluding the storage device used by the coredump process, from the first storage controller to the second storage controller for providing clients with failover access to the storage devices.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: April 24, 2018
    Assignee: NetApp Inc.
    Inventors: Hrishikesh Keremane, Sravana Kumar Elpula, Vijay Singh, Kalaivani Arumugham
  • Publication number: 20180095852
    Abstract: One or more techniques and/or computing devices are provided for automatic switchover implementation. For example, a first storage controller, of a first storage cluster, may have a disaster recovery relationship with a second storage controller of a second storage cluster. In the event the first storage controller fails, the second storage controller may automatically switchover operation from the first storage controller to the second storage controller for providing clients with failover access to data previously accessible to the clients through the first storage controller. The second storage controller may detect, cross-cluster, a failure of the first storage controller utilizing remote direct memory access (RDMA) read operations to access heartbeat information, heartbeat information stored within a disk mailbox, and/or service processor traps.
    Type: Application
    Filed: November 22, 2017
    Publication date: April 5, 2018
    Inventors: Hrishikesh Keremane, Vijay Singh
  • Patent number: 9928148
    Abstract: A technique efficiently configures a peered cluster storage environment. The configuration technique illustratively includes three phases: a discovery phase, a node setup phase and a cluster setup phase. The discovery phase may be employed to initiate discovery of nodes of a disaster recovery (DR) group through transmission of multicast advertisement packets by the nodes over interconnects, including a Fiber Channel (FC) fabric, to each other node of the group. In the node setup phase, each node of a cluster assigns its relationships to the nodes discovered and present in the FC fabric; illustratively, the assigned relationships include high availability (HA) partner, DR primary partner and DR auxiliary partner. In the cluster setup phase, the discovered nodes of the FC fabric are organized as the peered cluster storage environment (DR group) configured to service data in a highly reliable and available manner.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: March 27, 2018
    Assignee: NetApp, Inc.
    Inventors: Harihara Kadayam, Hrishikesh Keremane, Vaiapuri Ramasubramaniam, Rishabh Mittal, Chaitanya Patel, Santhosh Unnikrishnan, Sameer Deshpande
  • Publication number: 20180074925
    Abstract: Systems and methods which provide for managing multiple mirror resources in a storage distribution network are provided. In some embodiments, a system provides for both high availability and disaster recovery functionality at different mirroring locations. Other embodiments may provide for multiple high availability and/or multiple disaster recovery mirror resources. These mirror resources are operated in a heterogeneous manner in the sense that each have its own transport, protocol, and the like, but are configured function cooperatively or as a single mirror with respect to mirroring a primary node. Embodiments may provide for the mirroring and resynchronization of mirrored resources in the event of a communication loss with a particular resource without ceasing the mirroring operations to other resources.
    Type: Application
    Filed: November 6, 2017
    Publication date: March 15, 2018
    Inventors: Harihara Kadayam, Vaiapuri Ramasubramaniam, Rishabh Mittal, Hrishikesh Keremane
  • Publication number: 20180060198
    Abstract: A system and method for handling multi-node failures in a disaster recovery cluster is provided. In the event of an error condition, a switchover operation occurs from the failed nodes to one or more surviving nodes. Data stored in non-volatile random access memory is recovered by the surviving nodes to bring storage objects, e.g., disks, aggregates and/or volumes into a consistent state.
    Type: Application
    Filed: November 6, 2017
    Publication date: March 1, 2018
    Inventors: Vaiapuri Ramasubramaniam, Harihara Kadayam, Parag Sarfare, Yong Eun Cho, Chaitanya Patel, Hrishikesh Keremane, Prachi Deshmukh
  • Publication number: 20180011769
    Abstract: One or more techniques and/or systems are provided for dynamic mirroring. A first storage node and the second storage node within a first storage cluster may locally mirror data between one another based upon a local failover partnership. The first storage node and a third storage node within a second storage cluster may remotely mirror data between one another based upon a primary disaster recovery partnership. If the third storage node fails, then the first storage node may remotely mirror data to a fourth storage node within the second storage cluster based upon an auxiliary disaster recovery partnership. In this way, data loss protection for the first storage node may be improved, such that the fourth storage node provide clients with access to mirrored data from the first storage node in the event the second storage node and/or the third storage node are unavailable when the first storage node fails.
    Type: Application
    Filed: September 1, 2017
    Publication date: January 11, 2018
    Inventors: Hrishikesh Keremane, Iswarya Ayyappan, Allen Rintoul Keeranchira Joseph, Vaiapuri Ramasubramaniam, Jitendra Pratap Singh Chauhan
  • Patent number: 9836368
    Abstract: One or more techniques and/or computing devices are provided for automatic switchover implementation. For example, a first storage controller, of a first storage cluster, may have a disaster recovery relationship with a second storage controller of a second storage cluster. In the event the first storage controller fails, the second storage controller may automatically switchover operation from the first storage controller to the second storage controller for providing clients with failover access to data previously accessible to the clients through the first storage controller. The second storage controller may detect, cross-cluster, a failure of the first storage controller utilizing remote direct memory access (RDMA) read operations to access heartbeat information, heartbeat information stored within a disk mailbox, and/or service processor traps.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: December 5, 2017
    Assignee: NetApp, Inc.
    Inventors: Hrishikesh Keremane, Vijay Singh
  • Patent number: 9811432
    Abstract: Systems and methods which provide for managing multiple mirror resources in a storage distribution network are provided. In some embodiments, a system provides for both high availability and disaster recovery functionality at different mirroring locations. Other embodiments may provide for multiple high availability and/or multiple disaster recovery mirror resources. These mirror resources are operated in a heterogeneous manner in the sense that each have its own transport, protocol, and the like, but are configured function cooperatively or as a single mirror with respect to mirroring a primary node. Embodiments may provide for the mirroring and resynchronization of mirrored resources in the event of a communication loss with a particular resource without ceasing the mirroring operations to other resources.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: November 7, 2017
    Assignee: NetApp, Inc.
    Inventors: Harihara Kadayam, Vaiapuri Ramasubramaniam, Rishabh Mittal, Hrishikesh Keremane
  • Patent number: 9811428
    Abstract: A system and method for handling multi-node failures in a disaster recovery cluster is provided. In the event of an error condition, a switchover operation occurs from the failed nodes to one or more surviving nodes. Data stored in non-volatile random access memory is recovered by the surviving nodes to bring storage objects, e.g., disks, aggregates and/or volumes into a consistent state.
    Type: Grant
    Filed: December 3, 2014
    Date of Patent: November 7, 2017
    Assignee: NetApp Inc.
    Inventors: Vaiapuri Ramasubramaniam, Harihara Kadayam, Parag Sarfare, Yong Eun Cho, Chaitanya Patel, Hrishikesh Keremane, Prachi Deshmukh
  • Patent number: 9760458
    Abstract: One or more techniques and/or systems are provided for dynamic mirroring. A first storage node and the second storage node within a first storage cluster may locally mirror data between one another based upon a local failover partnership. The first storage node and a third storage node within a second storage cluster may remotely mirror data between one another based upon a primary disaster recovery partnership. If the third storage node fails, then the first storage node may remotely mirror data to a fourth storage node within the second storage cluster based upon an auxiliary disaster recovery partnership. In this way, data loss protection for the first storage node may be improved, such that the fourth storage node provide clients with access to mirrored data from the first storage node in the event the second storage node and/or the third storage node are unavailable when the first storage node fails.
    Type: Grant
    Filed: July 15, 2015
    Date of Patent: September 12, 2017
    Assignee: NetApp, Inc.
    Inventors: Hrishikesh Keremane, Iswarya Ayyappan, Allen Rintoul Keeranchira Joseph, Vaiapuri Ramasubramaniam, Jitendra Pratap Singh Chauhan
  • Patent number: 9715435
    Abstract: One or more techniques and/or systems are provided for interconnect failover between a primary storage controller and a secondary storage controller. The secondary storage controller may be configured as a backup or failover storage controller for the primary storage controller in the event the primary storage controller fails. Data and/or metadata describing the data (e.g., data and/or metadata stored within a write cache) may be mirrored from the primary storage controller to the secondary storage controller over one or more interconnect paths. Responsive to identifying a failover trigger for a failed interconnect path, the secondary storage controller is instructed to fence (e.g., block) I/O operations from the failed interconnect path. Streams of data and/or metadata that were affected by the failure may be instructed to transmit such data and/or metadata over one or more non-failed interconnect paths to the secondary storage controller during failover of the failed interconnect path.
    Type: Grant
    Filed: May 26, 2016
    Date of Patent: July 25, 2017
    Assignee: NetApp Inc.
    Inventors: Vaiapuri Ramasubramaniam, Rishabh Mittal, Amarnath Jolad, Hrishikesh Keremane, Harihara Kadayam