DISTRIBUTED STORAGE NETWORK

摘要

A distributed storage network of computers is disclosed in which a determination as to whether to migrate a data item from a computer connected to said network to another computer is made in dependence on a policy document associated with that data item. Where the level of usage of the data item is less than an expected amount found in one or more fields of the policy document, the data item is migrated. This provides for system-managed storage which adapts to changes in the network.