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...http://www.google.de/patents/US20050193245?utm_source=gb-gplus-sharePatent US20050193245 - Internet protocol based disaster recovery of a server
