Hi I would suggest to start with the Unity replication technologies white paper - it should answer most of your questions.  yes config info is replicated as well since you replicate the NAS server details on what is and what can be overriden are in configuring replication PDF manual  after a failover clients will see the same cifs server name and shares
I would like to inquire about the design of a NAS DR solution. I currently have two Unity 400s and would like to implement a replicated CIFS service in the booth of the second CPD. The communications between both CPDs are made through an extended LAN with the same IP address. My design questions arise mainly during configuration;  I create the NAS service in the primary CPD, the replication interfaces with their corresponding IPs in each of the centers.  Do I have to register another NAS server in the secondary CPD?  Is information replicated from both files and NAS/CIFS service?  When a failover is executed. Will users access without making changes to the original file path, such as \\NAS\Share?  Best regards
Design NAS DR solution