The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 22, 2014
Filed:
Oct. 14, 2011
Francesco Lacapra, Sunnyvale, CA (US);
Fiorenzo Cattaneo, Snoqualmie, WA (US);
Simon L. Benham, Berkshire, GB;
Trevor E. Willis, Bucks, GB;
Christopher J. Aston, Bucks, GB;
Francesco Lacapra, Sunnyvale, CA (US);
Fiorenzo Cattaneo, Snoqualmie, WA (US);
Simon L. Benham, Berkshire, GB;
Trevor E. Willis, Bucks, GB;
Christopher J. Aston, Bucks, GB;
Hitachi Data Systems Engineering UK Limited, Bracknell, Berkshire, GB;
Abstract
A distributed file system and method distributes file system objects across multiple self-contained volumes, where each volume is owned by a unique file system node. Logical links are used to reference a file system object between volumes. Each file system node includes a relocation directory in which is maintained hard links to locally-stored file system objects that are referenced from another file system node using logical links. Various file system operations that involve multiple volumes are performed without having to place a write lock on more than one volume at a time. Various caching schemes allow the various file system nodes to cache file system object data and metadata.