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:
Sep. 15, 2020
Filed:
Feb. 01, 2019
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
In one aspect, providing recovery during active/active replication includes: creating, at a first storage device, a local snapset; waiting for inflight (input/output) IO operations (IOs) from the first device to a second device at the time snapset creation to complete; creating a recovery snapset; and waiting for inflight IOs from the second device to the first device, at the time of snapset creation to complete. Upon determining a failure event, an aspect includes identifying a most recent local snapset (Sk) and a most recent recovery snapset (Sk') on the first and second devices, respectively, identifying predecessor snapsets (Sk−1) and (Sk−1′) on the first and second devices, respectively, creating a new recovery snapset (Sk′) using (Sk−1′), sending the delta of (Sk) and (Sk−1) from the first device to the second device; updating (Sk′) with the delta; and performing async-to-sync recovery to transfer a difference between the first and second devices.