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:
Oct. 26, 2021
Filed:
Mar. 16, 2020
Emc Ip Holding Company Llc, Hopkinton, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Techniques for providing hiccup-less failback and journal recovery. The techniques include determining a head position of a data log of a primary node and placing a marker at a corresponding position in a data log of a secondary node. In response to an IO request, the head of the primary log is moved to allocate space for writing a data entry, and the secondary node is directed to move a head of the secondary log to allocate space for writing the data entry. In response to a data entry being flushed from the primary node, a tail of the primary log is moved to reclaim allocated space for a previous data entry, and the secondary node is directed to move a tail of the secondary log to reclaim previously allocated space. In response to a tail of the secondary log coinciding with the marker position, content of the logs is synchronized.