A data storage system adapted to maintain redundant data storage sets at a destination location(s) is disclosed. The data storage system establishes a copy set comprising a source volume and a destination volume. Data written to a source volume is automatically copied to the destination volume. The data...http://www.google.de/patents/US20030188233?utm_source=gb-gplus-sharePatent US20030188233 - System and method for automatic site failover in a storage area network
