Veritas Technologies LLC

Kundan Kumar

Anindya Banerjee

Jitendra Patidar

Ranjit Noronha

Sneha Pawar

Bhushan Jagtap

Mark Hemment

Disclosed herein are methods, systems, and processes to provide coherency across disjoint caches in clustered environments. It is determined whether a data object is owned by an owner node, where the owner node is one of multiple nodes of a cluster. If the owner node for the data object is identified by the determining, a request is sent to the owner node for the data object. However, if the owner node for the data object is not identified by the determining, selects a node in the cluster is selected as the owner node, and the request for the data object is sent to the owner node.

Methods and systems for maintaining cache coherency between nodes in a clustered environment by performing a bitmap lookup in response to a read request from one of the nodes

The disclosed computer-implemented method for maintaining cache coherency may include (1) receiving an indication of a revocation of a grant to an owner node of a shared lock for a data object owned by the owner node, (2) invalidating, in response to the indication, a copy of the object in a local cache of the owner node, (3) releasing, in response to the indication, the grant of the shared lock, (4) receiving, after the releasing of the grant, a request from the requesting node to update the object in the cache, (5) transmitting, in response to the request to update the object, a request for a shared lock for the object, (6) receiving an indication of a grant of the shared lock, and (7) updating, in response to the grant of the shared lock, the object in the cache. Various other methods, systems, and computer-readable media are also disclosed.

Systems and methods for maintaining cache coherency

Methods and systems for maintaining cache coherency between caches of nodes in a clustered environment

The disclosed computer-implemented method for maintaining cache coherency may include (1) receiving an indication of a revocation of a grant to an owner node of a shared lock for a data object owned by the owner node; (2) invalidating, in response to the indication of the revocation, a copy of the object in a local cache of the owner node; (3) receiving, while the requesting node holds a grant of an exclusive lock, a request from the requesting node to update the object in the local cache; (4) transmitting, in response to the request to update the object, a request for a shared lock for the object; (5) receiving an indication of a grant of the shared lock; and (6) updating, in response to the grant of the shared lock, the object in the local cache. Various other methods, systems, and computer-readable media are also disclosed.

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Pune, India

Kundan Kumar