Hitachi Data Systems Engineering UK Limited

Timothy Warner

Zahra Tabaaloute

James Gibbs

Richard Powell

Daniel Picken

Ray Brown

Jon Smith

Chris Aston

Joseph Smith

Michael Benson

Mike Benson

The present invention relates to a method and an apparatus for data migration of a first file system in a data storage system comprising a plurality of client computers, a first file system managing unitfor managing the first file system and being connected to the plurality of client computers, and a second file system managing unitfor managing a second file system and being connected to the first file system managing unit, the second file system comprising a plurality of data files and the first file system comprising a plurality of external link objects, each external link object of the first file system being associated with a respective data file of the second file system for enabling client access to the respective data file of the second file system.

Method and apparatus for migration of a virtualized file system, data storage system for migration of a virtualized file system, and file server for use in a data storage system

The method performed by the apparatus includes interconnecting a first file system managing unitbetween the plurality of client computersand the second file system managing unit, creating a first directory /root in a first file system managed by the first file system managing unit, associating a first directory /root of the second file system with the first directory /root of the first file system, enabling on-demand virtualization of the second file system by the first file system managing unitbased on client requests received from the client computersat the first file system managing unitand based on the association between the first directory of the first file system and the first directory of the second file system, and enabling indirect client access to the second file system through the first file system.

Method and apparatus for virtualization of a file system, data storage system for virtualization of a file system, and file server for use in a data storage system

The method and an apparatus provides a virtualized file system enabling indirect access to a second file system in a data storage system comprising a plurality of client computersand a second file system managing unitfor managing the second file system and enabling client access to the second file system, the method comprising interconnecting a first file system managing unitbetween the plurality of client computersand the second file system managing unit, creating a directory /root in a first file system managed by the first file system managing unit, a directory /root of the second file system with the directory /root of the first file system, enabling on-demand virtualization of the second file system by the first file system managing unitbased on client requests received from the client computersat the first file system managing unit

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Farnborough, United Kingdom

Timothy Warner