Symantec Corporation

Symantec Operating Corporation

Viraj Kamat

Amol Shivram Katkar

Shailesh Marathe

Abhijit Toley

Grace Jing Chen

Udipta Das

Shardul Divatia

Praween Kumar

Venu Gopal Gadiraju

Information cluster systems and methods are presented. In one embodiment, a cluster method comprises: performing an engine process including issuing requests to bring a resource online, offline, and monitor the resources, wherein the engine process is performed by an engine; performing a resource interaction process including interacting with a resource and directing a resource to comply with the request from the engine process, wherein the resource interaction process is performed by a resource interaction agent; performing a predicate logic process including performing predicate logic operations to determine if a predicate logic condition associated with the resource is satisfied and forwarding an indication of the results of the predicate logic operations to the engine process, wherein the predicate logic process is performed by a predicate logic agent that is separate from the engine performing the engine process.

Cluster systems and methods

A computer-implemented method for changing fencing modes in clusters may include (1) identifying a cluster of nodes configured with a fencing mode for resolving split-brain scenarios within the cluster, (2) identifying a request to reconfigure the cluster of nodes with a new fencing mode, (3) transmitting the request to each node in the cluster of nodes, (4) in response to the request, for each node in the cluster of nodes, testing the operability of the new fencing mode from the node, (5) receiving a message from the node indicating the success of the test; and, after receiving the message indicating the success of the test from every node within the cluster of nodes, and (6) reconfiguring each node within the cluster of nodes to use the new fencing mode. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for changing fencing modes in clusters

Various embodiments of a system and method for handling network partitions in a cluster of nodes are disclosed. The system and method may use a set of arbitration servers that are ordered in a particular order. Client nodes in different partitions may send requests to the arbitration servers to attempt to win control of them. The client node that wins a majority of the arbitration servers may remain in the cluster, and the client nodes in the other partitions may exit the cluster. The first arbitration server may award control to whichever client node whose request for control is received first. The remaining arbitration servers may be configured to give preference to the winner of one or more of the previous arbitration servers to attempt to ensure that one of the client nodes wins a majority.

Intelligent arbitration servers for network partition arbitration

Embodiments of the present invention are directed to a method and system for draining or aborting IO requests of a failed system prior to restarting or recovering an application in virtual environments. The method includes detecting, within an electronic system, an application error condition of an application executing on a virtual machine and determining an application restart target. The method further includes sending an input/output (IO) request drain command to a virtual IO server operable to provide storage to the virtual machine and receiving a signal that the IO requests have been drained. The drain command is operable to drain IO requests issued from the application. The application can then be restarted or recovered.

Data corruption prevention during application restart and recovery

A computer-implemented method for managing sub-clusters within a multi-cluster computing system subsequent to a network-partition event may include: 1) identifying a plurality of computer clusters, 2) identifying a network-partition event that partitions each of the plurality of computer clusters into multiple sub-clusters, 3) identifying, within the multiple sub-clusters, a plurality of nodes that share a common attribute or property, and then 4) ensuring that only those nodes that share the common attribute survive subsequent to the network-partition event. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for managing sub-clusters within a multi-cluster computing system subsequent to a network-partition event

Various embodiments of methods and systems for dynamically switching to a new coordinator resource are disclosed. In one embodiment, a method involves receiving information identifying a new coordinator resource for use by a cluster; detecting whether each of the nodes within the cluster is committing to use the new coordinator resource; and switching from an existing coordinator resource to the new coordinator resource, in response to detecting that each of the nodes within the cluster is committing to use the new coordinator resource. This method can be performed concurrently with normal cluster operations, and thus the cluster need not be disabled to perform the switchover.

Growing community of inventors

Pune, India

Viraj Kamat