Symantec Corporation

Veritas Technologies LLC

Asmita Jagtap

Prasanta Ranjan Dash

Chaitanya Yalamanchili

Amarinder Singh Randhawa

Madhav Buddhi

Niranjan Sanjiv Pendharkar

Shailesh Marathe

Harshad Toke

Sumit Sharma

Sudhakar Kasina

Prasanth Nalini Sasidharan

Mangesh Panche

Nitin Wankhede

Various systems and methods for managing node connectivity in distributed storage systems are disclosed. For example, one method involves detecting a communication fault between two nodes. A first node is configured to communicate input/output (I/O) requests to the second node as in-flight I/O requests. The second node is configured to communicate locally generated I/O requests and the received I/O requests to storage devices. Once the communication fault is detected, a fencing operation is performed. The fencing operation can include processing some of the received I/O requests by the second node, and rejecting any additional in-flight I/O requests received from the first node.

Performing fencing operations in multi-node distributed storage systems

Various systems and methods for performing Input/Output (I/O) quiesce and drain operations in multi-node distributed storage systems are disclosed. For example, one method involves receiving a message. The message indicates a request for a operation to be performed by a node, where the node can receive I/O requests from an application, as well as remote I/O requests from another node. The node can issue the I/O requests and the remote I/O requests to the one or more storage devices. In response to receipt of the message, the method performs a first portion of a operation on the node. The first portion of the operation includes the node not processing any additional locally generated I/O requests and processing additional remote I/O requests.

Performing I/O quiesce and drain operations in multi-node distributed systems

When a loss of connectivity between a first node in a cluster of nodes and a data store is detected, an input/output (I/O) request associated with an application that was executing on the first node is shipped to a second node in the cluster that is in communication with the data store. The application can be gracefully shut down on the first node, and the second node can execute the application and satisfy the I/O request.

Intelligent failover or shutdown of an application using input/output shipping in response to loss of connectivity to data storage in a cluster

A computer-implemented method for transferring input/output operations within computer clusters may include (1) identifying a computer cluster that includes (i) a plurality of nodes configured to facilitate access to a plurality of physical storage devices and (ii) at least one computing object that represents data stored on the physical storage devices, (2) detecting at least one failure that prevents at least one node within the computer cluster from performing at least one input/output operation on the computing object that represents the data stored on the physical storage devices, (3) identifying at least one other node within the computer cluster that is able to perform the input/output operation on the computing object, and then (4) directing the other node within the computer cluster to perform the input/output operation on the computing object. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for transferring input/output operations within computer clusters

A method and apparatus for monitoring a process to determine when an abnormal process exit occurs comprising monitoring events related to the process and detecting a communication connection closing without receiving a notification of an exit event for the process. On detection of an abnormal exit of a process associated with the communication connection, the method and apparatus provide special failover processing including, for example, a TCP connection failover process.

Method and apparatus for detecting process failure

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Pune, India

Asmita Jagtap