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. 08, 2009
Filed:
Mar. 25, 2005
Joydeep Sarma, Sunnyvale, CA (US);
Michael Federwisch, San Jose, CA (US);
Steven Watanabe, San Jose, CA (US);
Alan Lawson Rowe, San Jose, CA (US);
Joydeep Sarma, Sunnyvale, CA (US);
Michael Federwisch, San Jose, CA (US);
Steven Watanabe, San Jose, CA (US);
Alan Lawson Rowe, San Jose, CA (US);
Netapp, Inc., Sunnyvale, CA (US);
Abstract
An embodiment of the invention provides an apparatus that includes a primary node, a secondary node, and an intermediate node. Data is synchronously copied from the primary node to the intermediate node, and data is asynchronously copied from the intermediate node to the secondary node. The data stored in the intermediate node is a subset of the data set that is stored in the primary node. Therefore, an embodiment of the invention advantageously provides a multiple hop data replication method that allows data recovery if disaster occurs at the location of the primary node. Additionally, an embodiment of the invention advantageously provides a tolerable latency value from the time that a client device sends a write request to the primary node to the time that an acknowledgement message is received by the client device.