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:
Nov. 02, 2021
Filed:
Jul. 31, 2017
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Joris J. M. Wils, Acton, MA (US);
Richard P. Ruef, Santa Cruz, CA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Techniques for amortizing metadata updates due to data delete operations in data storage systems that implement log structured storage of data from virtual volumes. The techniques employ a segment database (DB) and a deleted chunk DB. The segment DB is implemented as a key-value store. The deleted chunk DB is likewise implemented as a key-value store, but configured as a log structured merge (LSM) tree. By configuring the deleted chunk DB as an LSM-tree, more efficient use of memory and improved reduction of metadata updates can be achieved. Stored segments of log structured data can also be effectively 'cleaned' in a background process that involves ordered traversals of the segment DB and the deleted chunk DB, allowing for more efficient recovery of storage space consumed by the deleted data chunks.