http://blogs.technet.com/filecab/archive/2008/10/13/storage-tips-read-write-failures-even-with-dfs-failover.aspxIf you opened a file, and in the meanwhile the connection to the server was lost, and you don’t have CSC enabled, any further attempt to read/write will fail. DFS Failover is only performed when the client opens a file or folder. It does not applyen-USCommunityServer 2.1 SP1 (Build: 61025.2)