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. 29, 2020
Filed:
Oct. 31, 2018
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Dmitry Tylik, Westborough, MA (US);
Matthew H. Long, Uxbridge, MA (US);
Daniel E. Cummins, Hudson, NH (US);
Nagasimha Haravu, Apex, NC (US);
Kenneth Hu, Lexington, MA (US);
Matthew Eaton, Mansfield, MA (US);
Matthew Jean, Shirley, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
A primary copy and one or more shadow copies of a logical volume are created and discovered by a host rescan performed when the logical volume is initially created. Data storage resources are allocated to the primary copy, but not to the shadow copy. The initial path state of the logical volume describes the path to the primary copy as active, and the path to the shadow copy as unavailable for accessing the logical volume. Movement of the logical volume to the storage appliance providing the shadow copy can be performed without an additional host rescan, by making the shadow copy the new primary copy, making the primary copy a new shadow copy, and updating the path state of the logical volume to indicate i) that the path to the new primary copy is active, and ii) that the path to the new shadow copy is unavailable.