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:
Jun. 03, 2008
Filed:
Feb. 04, 2004
John M Hayden, Holliston, MA (US);
Hongmei Wang, Shrewsbury, MA (US);
Frederic Corniquet, Le Pecq, FR;
Philippe Armangau, Acton, MA (US);
Pascal Donette, Magny les Hameaux, FR;
Aju John, Northborough, MA (US);
John M Hayden, Holliston, MA (US);
Hongmei Wang, Shrewsbury, MA (US);
Frederic Corniquet, Le Pecq, FR;
Philippe Armangau, Acton, MA (US);
Pascal Donette, Magny les Hameaux, FR;
Aju John, Northborough, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
For disaster recovery of a file server at an active site, the files that define the user environment of the file server are replicated to a virtual server at a disaster recovery site. To switch over user access from the active site to the disaster recovery site, the disaster recovery system determines whether there are sufficient network interfaces and file system mounts at the disaster recovery site. If so, the required resources are reserved, and user access is switched over. If not, an operator is given a list of missing resources or discrepancies, and a choice of termination or forced failover. Interruptions during the failover can be avoided by maintaining a copy of user mappings and a copy of session information at the disaster recovery site, and keeping alive client-server connections and re-directing client requests from the active site to the disaster recovery site.