To fully comprehend the process, two terms need to be understood.
failover - Selecting a server from a list of servers supporting a replicated file system. Normally, the next server in the sorted list is used, unless it fails to respond.
remap - Making use of a new server. Through normal use, the clients store the path name for each active file on the remote file system. During the remap, these path names are evaluated to locate the files on the new server.