Nathan D Faber

US Patent:

20090198817, Aug 6, 2009

Filed:

Jul 28, 2008

Appl. No.:

12/180813

Inventors:

Ravi Sundaram - Cambridge MA, US
Nathan Faber - Allston MA, US

Assignee:

NORTHEASTERN UNIVERSITY - Boston MA

International Classification:

G06F 15/16

US Classification:

709227

Abstract:

A first virtual server is moved from a first network location to a second network location without interrupting service to users of the first virtual server. The state and data of the first virtual server are copied and transmitted to the second network location to create a copy of the first virtual server. The first virtual server copy is then updated to duplicate the first virtual server and all connections or packets directed to the first virtual server are intercepted and directed to the first virtual server copy at the second network location. A DNS entry for the symbolic name of the first virtual server is updated to reflect a shortened TTL value and then the address field of the DNS entry is set to the address of the first virtual server copy after the changeover and subsequent connections are directed to the first virtual server copy.