Information processing apparatus for performing file migration on-line between file servers

摘要

There is disclosed a file migration apparatus for migrating a file properly between file servers on-line by impersonating an owner of exclusive lock and generating a replication. A message forwarder relays forwarding of messages between clients and servers. An exclusive lock state information manager manages exclusive lock state information. In response to a request to generate a replication of a file, a file replicator asks the exclusive lock state information manager for the exclusive lock state information. If the file is in exclusive lock, the file replicator impersonates the owner of exclusive lock and generates a replication. The message forwarder blocks forwarding of messages while performing a process of maintaining consistency between the file and the replication. The file replicator checks if there is consistency between the file and the replication or not. If there is no consistency between the file and the replication, the file replicator generates a replication again. If there is consistency between the file and the replication, the file replicator switches access to the file to the replication.