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:
Mar. 23, 2021
Filed:
Jul. 21, 2017
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Xiangping Chen, Sherborn, MA (US);
Ying Hu, Northborough, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
A storage system is configured to comprise a processor in operable communication with a storage device and a metadata journal comprising metadata configured to store information associated with a change to be made to information stored on the storage device. While the storage system is booted up and responsive to I/O requests from a host, a scan is performed of a first portion of metadata that is loaded into storage system memory during the bootup, to check for existence of a metadata inconsistency condition comprising at least one of: (a) dirty tree (DT) entries in the metadata associated with an invalid logical unit (LU) index; (b) hash tree (HT) entries in the metadata which do not have corresponding DT bits; and (c) DT bits set without having a corresponding HT entry. Based on the results of the first scan, a determination is made about whether a first metadata inconsistency condition exists.