The following steps are useful to rename a netapp filer, in order to preserve name space when migrating from netapp to emc. Unfortunately DFS wansn't used before I started working here, so I had 4 netapp filer names hosting CIFS shares that I had to migrate to EMC Celerra. After using rainfinity to replicate the shares from netapp to EMC, I had to perform the following steps to steal the name for the netapp and reuse it on the Celerra.
Connect to the filer by \\filername\c$\etc and copy the existing rc & hosts files as rc.old & hosts.old.
Open up the original hosts file and search and replace for the filers name and replace with the new name
Open up the original rc file, update the following hostname
Update the NetBIOS name on the filer by typing "options cifs.netbios_aliases "
Run the following on the filer you are renaming "CF disable" to disable the cluster, "CIFS Terminate" to terminate the cifs service.
Remove the entry for the old filer name from Active Directory users and computers and from DNS
Run Cifs Setup to add the filer back into Active directory and DNS with the new name
Run "CF enable" to enable the cluster.
Connect to the node that you failed over to and type "CF takeover" this will cause a reboot of the filer that you renamed
Once the filer that you renamed is back & you will see a message saying giveback operation is now available