Hi,
Refer http://www.netapp.com/us/media/tr-3771.pdf
Dynamic DNS update may be useful. Refer page 22
Dynamic DNS Updates Using dynamic DNS updates can prevent errors and save time when sending new or changed DNS information to the primary master DNS server for your storage system's zone. Dynamic DNS allows your storage system to automatically send information to the DNS servers as soon as the information changes on the system. NetApp recommends enabling the dynamic DNS updates. Otherwise, you must manually add the DNS information (DNS name and IP addresses) to the DNS server when a new storage system is brought online or when existing DNS information changes. This process is slow and error-prone. In a disasterrecovery situation, manual configuration can result in long downtimes. Data ONTAP supports a maximum of 64 Dynamic Domain Name Server (DDNS) aliases.
