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:
Apr. 20, 2021
Filed:
Apr. 29, 2019
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Rohit K. Chawla, Scotch Plains, NJ (US);
William C. Davenport, San Diego, CA (US);
Richard P. Ruef, Santa Cruz, CA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Techniques for handling pattern identifiers in a data storage system. By replacing a block pointer with a pattern identifier, the techniques can identify a data block (or an indirect data block) as a bad block, without resorting to the use of a separate flag or bad block (BB) bit in per-block metadata (e.g., a mapping pointer) of the data block. The techniques can also avoid waste of valuable metadata space by using pattern identifiers at various levels of a mapping tree, leveraging pointer granularity at lower levels, mid-levels, and progressively higher levels of the mapping tree.