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:
Jul. 26, 2016
Filed:
Mar. 13, 2013
Emc Corporation, Hopkinton, MA (US);
Helen S. Raizen, Jamaica Plain, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
Data is non-disruptively migrated from a source LUN to a target LUN in an active-active cluster with coordination of a host-based copy sweep with duplicating of ongoing writes of all hosts, using iteration and changed block tracking (CBT). During a first iteration, one host performs the copy sweep, and the locations of new application writes at other hosts are recorded in respective CBT records. In each subsequent iteration, the data blocks of the CBT-recorded writes are copied to the target LUN while the locations of new writes are recorded in new CBT records. A final iteration is done with I/O suspended to completely synchronize the target LUN with the source LUN, and the migration then proceeds to a committed state in which the target LUN is used in place of the source LUN. The one host may use write cloning or CBT recording like the other hosts.