Veritas Technologies LLC

Symantec Corporation

Udipta Das

Amol Shivram Katkar

Jai P Gahlot

Pranav Peshwe

Amit Haridas Rangari

Viraj Kamat

Praween Kumar

Various systems, methods, and processes to optimize partition arbitration are disclosed. In response to a cluster being partitioned into multiple network partitions, a determination is made, using a first node in a first network partition, whether the first node wins one or more coordination points. The determination of the first node is then transmitted to a second node in the first network partition. Further, another determination is made using the second node whether the second node wins one or more other coordination points other than the one or more coordination points won by the first node.

Partition arbitration optimization

Various systems, methods, and processes to optimize input/output (I/O) fencing operations in systems that implement coordination points are presented. A matrix is generated. The matrix includes information indicating the accessibility of one or more coordination points by a node. The method then transmits the matrix to one or more other nodes.

Input/output fencing optimization

Various methods, systems, and processes to prevent data corruption caused by a pre-existing split brain condition in a cluster are presented. In response to determining that a node is no longer part of a sub-cluster, another node in the sub-cluster is designated as a racer node. The racer node accesses a matrix, and the matrix includes information to determine whether a majority of coordination points in a cluster are accessible by nodes in the sub-cluster. Based on the accessing, a determination is made that the information indicates that the majority of coordination points are accessible by the nodes. The information is then broadcasted.

Preventing data corruption due to pre-existing split brain

Various systems and methods for detecting a site change. For example, one method involves detecting migration of a virtual machine. The method also involves determining whether the virtual machine moved from one site to another site during the migration. The method also involves updating location information, where the location information is updated in response to determining whether the virtual machine moved from one site to another.

Detecting site change for migrated virtual machines

A computer-implemented method for enabling migratory virtual machines to expedite access to resources may include (1) detecting a migration of a virtual machine from a physical computing system to a different physical computing system, (2) locating resource information within the virtual machine that identifies an access path to a resource of the physical computing system despite the migration of the virtual machine, (3) identifying a different access path to a corresponding resource of the different physical computing system, and then (4) modifying the resource information within the virtual machine to identify the different access path to the corresponding resource in order to expedite resource access by enabling the virtual machine to access the corresponding resource via the different access path instead of accessing the resource via the access path. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for enabling migratory virtual machines to expedite access to resources

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 performing first failure data captures may include 1) identifying a process that has failed within an old process context and is undergoing a first failure data capture within the old process context, 2) identifying at least one resource allocated within the old process context and required for restarting the process in a new process context, 3) freeing the resource from the old process context before terminating the process within the old process context, and 4) initiating the process in the new process context before the process within the old process context has terminated. Various other methods, systems, and computer-readable media are also disclosed.

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Maharashtra, India

Udipta Das