Using standard Celerra Replicator tools, only an entire VDM can be failed over, all CIFS servers and filesystems inclusive of that VDM.  For temporary use, you could snapshot the target filesystem, create a new CIFS server and mount that but the CIFS server would have to be a different name, or in an isolated AD Domain if you need the same name and it would not be something you can keep running for production.  If you wanted to be able to individually fail over each CIFS server, they would need to be in separate VDMs with dedicated IP interfaces on both sides.
I've only done VDM failover where there was only a single CIFS server if we have a VDM with multiple servers, is it possible to failover an individual CIFS server?  thanks
failover single CIFS server on VDM