Your CIFS server needs to talk to your DNS server to join AD.  You'll need a default or static route to allow the CIFS server to talk to AD.  Can you check your routing information?
My customer brought 2 vnx 5400 boxes.one for primary site and second DR site.now i installed this boxes and cabling completed.i did interface configuration. i need to configure cifs server(100TB) and Block storage for fc servers(60TB). i need to configure share folders for users.need to add domain and enable home folder. Please tel me how to configure this are.  eg-first configure pool-->create VDM-->create file system-->create cifs server-->create cifs share.  If u can give steps like this.
how to configure vnx 5400