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:
Apr. 28, 2020
Filed:
Apr. 25, 2017
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Sandeep Chandrashekhara, Shrewsbury, MA (US);
Ning Wu, Northborough, MA (US);
Michael Ferrari, Shrewsbury, MA (US);
George Lettery, North Grafton, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
To allow prompt creation of a target-less snapshot of a target logical volume, after the target logical volume has been linked to a target-less snapshot to allow host access to the target-less snapshot, and prior to all the tracks of the target logical volume being defined with regard to data from the target-less snapshot, a target device sequence number is maintained for the target logical volume, and incremented each time a target-less snapshot is linked to the target logical volume. A target track sequence number is maintained for each track of the target logical volume, and updated each time target-less snapshot data is moved to the corresponding track. The target device sequence number and target track sequence numbers are compared prior to performing host I/O operations directed to the target logical volume to ensure data correctness on a track by track basis.