Hitachi Vantara Corporation

Hitachi, Ltd.

Hitachi Data Systems Engineering UK Limited

Daniel Picken

James Gibbs

Zahra Tabaaloute

Joseph Smith

Jon Smith

Chris Aston

Mitsuo Hayasaka

Yuko Matsui

Christopher J Aston

Richard Powell

Simon Crosland

Timothy Warner

Jonathan Smith

Ray Brown

Michael Benson

Namita Lal

Hoc Dinh Ngo

Hieu Hanh Le

Jonathan Teh

Zahra Badey

In a distributed storage of data objects in a cluster system, a data object is distributed across a group of node apparatuses in units of data blocks. For each child object, the metadata structure of the respective child object is stored to one of the node apparatuses of the group of node apparatuses for managing locations of data blocks of the data object and includes a root metadata node and one or more direct metadata nodes, optionally further including one or more indirect metadata nodes; and the metadata structure of the parent object is distributed across the plural node apparatuses of the group of node apparatuses for managing locations of child objects of the data object and includes, on each node apparatus of the group of node apparatuses, a root metadata node and one or more direct metadata nodes, optionally further including one or more indirect metadata nodes.

Data storage system and process for providing distributed storage in a scalable cluster system and computer program for such data storage system

A data de-duplication in a distributed storage of data objects in a cluster system, in which plural data objects are distributed across a group of node apparatuses and stored in units of data blocks. Each metadata structure including a root metadata node and one or more direct metadata nodes, and optionally including one or more indirect metadata nodes; and a metadata object is stored for managing de-duplicated data blocks based on a metadata structure of the metadata object wherein at least one direct metadata node of the metadata structure of the metadata object includes a block reference pointing to a de-duplicated data block being associated with two or more data objects. Preferably, each of the metadata structures of the two or more data objects being associated with the de-duplicated data block includes a respective direct metadata node including an object reference to the metadata structure of the metadata object.

Data storage system, process, and computer program for de-duplication of distributed data in a scalable cluster system

The present disclosure relates to management of cloned objects and corresponding snapshot objects in file systems by a file server. Aspects may relate to one or more processes for managing file system objects of a file system in a data storage system comprising a file system server, wherein the file system server comprises: a computer system including a processor configured to execute an operating system and further software components executed on the operating system, and a programmable logic device interfacing with the computer system and including a file system management unit configured to manage a file system.

Management of cloned objects in file systems

At the target side, a first instruction to replicate a first target snapshot-file of a target snapshot-file tree of the target file system is received, the first target snapshot-file of the target file system being associated with a first source snapshot-file of the source file system which has been modified in the source file system. One or more data blocks which are owned by a second target snapshot-file and which are shared between the first target snapshot-file and the second target snapshot-file are identified, the second target snapshot-file being an ancestor of the first target snapshot-file in the target snapshot-file tree. Then, at the target side, ownership of the one or more identified data blocks is transferred from the second target snapshot-file to the first target snapshot-file.

Method, system and computer program product for replicating file system objects from a source file system to a target file system and for de-cloning snapshot-files in a file system

Example implementations described herein include systems and methods for processing the deletion of a directory that can include one or more subdirectories. In a system including a server having a hardware-side and a software-side that manages one or more storage systems or storage devices, a client may request the deletion of a directory, whereupon the processing of the directory occurs in a work queue and subtree queue for processing subdirectories.

Fast and efficient multi-threaded algorithm for deleting an arbitrarily wide and deep directory tree using limited system resources

Object-level replication of cloned objects from a source file system to a target file system in a data storage system maintains relationships between related objects including shared data blocks so that storage requirements in the target file system match storage requirements of the source file system. Specialized processing may be used to scan an indirection object that refers to other file system objects such that objects requiring replication can be identified on an incremental basis based on checkpoint numbers. Checkpoints in the target file system are managed so that checkpoint number requirements for replicated clone objects are enforced in the target file system.

Object-level replication of cloned objects in a data storage system

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

Growing community of inventors

Sunnyvale, CA, United States of America

Daniel Picken