The data storage system is connected to a local area network and includes a storage server that on a demand basis and/or on a periodically scheduled basis audits the activity on each volume of each data storage device that is connected to the network. Low priority data files are migrated via the network...http://www.google.com.hk/patents/US5537585?utm_source=gb-gplus-share專利 US5537585 - Data storage management for network interconnected processors
Data storage management for network interconnected processors