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:
Dec. 27, 2011
Filed:
Mar. 30, 2005
Suresh K. Jasrasaria, Boxborough, MA (US);
Suresh K. Jasrasaria, Boxborough, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
A storage system executes a delta set asynchronous remote replication protocol, wherein writes to a local copy are aggregated into delta sets during successive delta cycles. The delta sets are sent to a remote storage system to be written to a remote copy. Independent of the delta cycles, the local storage system receives a signal representing an external event. In response to receiving the signal, all writes just prior to and in accordance with the external event are posted to the local copy, the current delta set is ended, and a marker delta set is inserted in the delta set stream. The delta sets received at the remote storage system are monitored for the marker delta set. When the marker delta set is received, it is indicated that the remote copy is consistent with the local copy just prior to the external event at the local storage system.