Netapp, Inc.

Network Appliance, Inc.

Sreelatha Sunkara Reddy

John K Edwards

Stephen Wu

Andy Kahn

John F Gillono

Edward Ramon Zayas

Thomas Haynes

Susan M Coatney

Raymond C Chen

Harihara Kadayam

Hrishikesh Keremane

Vaiapuri Ramasubramaniam

Paul Christopher Eastham

Chaitanya V Patel

Laurent Nicolas Lambert

Muralidharan Rangachari

George Cabrera, Iii

Thomas B Bolt

Chaitanya Patel

Synchronous local and cross-site switchover and switchback operations of a node in a disaster recovery (DR) group are described. In one embodiment, during switchover, a takeover node receives a failover request and responsively identifies a first partner node in a first cluster and a second partner node in a second cluster. The first partner node and the takeover node form a first high-availability (HA) group and the second partner node and a third partner node in the second cluster form a second HA group. The first and second HA groups form the DR group and share a storage fabric. The takeover node synchronously restores client access requests associated with a failed partner node at the takeover node.

Synchronous local and cross-site failover in clustered storage systems

A system and method maintains mappings from data containers to their parent directories within a file system of a storage system. Each inode is modified to include a primary name data structure comprising a parent directory inode and a parent directory cookie value. The parent directory cookie value identifies a particular directory entry within a specified block of a directory identified by parent directory inode. An alternate name file is utilized to store alternate names, such as those associated with hard links.

System and method for maintaining mappings from data containers to their parent directories

Embodiments described herein adapt static-image and clone technology to provide a simulated dynamic image to an application requesting a dynamic image. A storage system is configured to backup its file system by taking a first static image of the file system at a point in time. A clone of the first image may then be produced, the clone containing any subsequent changes to the file system and a reference pointer to the first image. A second static image of the clone is then produced. An application may request, from the storage system, an image of the file system. In response, the second static image may be presented to the application as a simulated dynamic image.

Providing a simulated dynamic image of a file system

A method for handling a fault in a storage system comprises maintaining data in a mass storage subsystem and providing access to the data on behalf of a client. The method further comprises detecting a fault in a volume of data stored in the mass storage subsystem, determining a severity of the fault, and selecting a course of action in response to the fault, based on the severity of the fault.

Method and apparatus for handling data corruption or inconsistency in a storage system

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Sunnyvale, CA, United States of America

Sreelatha Sunkara Reddy