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. 28, 2023
Filed:
Mar. 31, 2021
Nutanix, Inc., San Jose, CA (US);
Alok Nemchand Kataria, Maharashtra, IN;
Niranjan Sanjiv Pendharkar, Maharashtra, IN;
Pete Wyckoff, Durham, NC (US);
Rishi Bhardwaj, San Francisco, CA (US);
Rohit Jain, Cupertino, CA (US);
Shubham Shukla, Bhopal, IN;
Tabrez Parvez Memon, Campbell, CA (US);
Nutanix, Inc., San Jose, CA (US);
Abstract
A technique replicates an index of an operations log (oplog) from a primary node to a secondary node of a cluster in the event of failure. The oplog functions as a staging area to coalesce random write operations directed to a virtual disk (vdisk) stored on a backend storage tier. The oplog temporarily caches write data as well as metadata describing the write data. The metadata includes descriptors to the write data corresponding to offset ranges of the vdisk and are used to identify ranges of write data for the vdisk that are cached in the oplog. To facilitate fast lookup operations of whether write data is cached in the oplog, an oplog index provides a state of the latest data for offset ranges of the vdisk that enables fast failover of metadata used to construct the oplog index in memory without downtime or significant metadata replay.