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:
Sep. 19, 2017
Filed:
Jun. 30, 2008
Christopher J. Aston, Bucks, GB;
Simon L. Benham, Berkshire, GB;
Neil Berrington, San Jose, CA (US);
Christopher J. Aston, Bucks, GB;
Simon L. Benham, Berkshire, GB;
Neil Berrington, San Jose, CA (US);
HITACHI DATA SYSTEMS ENGINEERING UK LIMITED, Berkshire, GB;
Abstract
Embodiments of the present invention allow multiple checkpoints to be taken so that multiple versions of the filesystem, including a working version and at least two checkpoint versions, can be maintained over time. Specifically, at least three 'superblock' root structures are used to manage multiple instantiations of the filesystem. The superblocks are preferably stored in fixed locations within the storage system for easy access, although they may alternatively be stored in other ways. The number of superblocks may be fixed or variable.