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. 07, 2020
Filed:
Dec. 31, 2018
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Michael Paul Wagner, Raleigh, NC (US);
Michael C. Brundage, Cary, NC (US);
Alan L. Taylor, Cary, NC (US);
Michael J. Noeth, Cary, NC (US);
Peter J. McCann, Mason, NH (US);
Steven A. Morley, Mendon, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Techniques are presented for implementing a scalable approach to keeping track of the metadata validity of persistently-stored metadata for storage objects. In contrast with prior approaches, improved techniques only store a list of the invalid (or quarantined) objects rather than all objects regardless of validity of their metadata. Under normal circumstances, only a small number of storage objects are invalid at any given time, as the system generally takes steps to repair the invalid objects in the normal course of operation. Thus, the number of invalid objects tends to be small, barring some catastrophic system failure. Only a small amount of expensive privileged persistent storage is therefore needed. A health level may also be used to indicate many failures, indicative of catastrophic system failure.