Beginning in ONTAP 9.2 and later, you should verify the status of your Domain Name Service (DNS) server before and after performing a nondisruptive upgrade.
About this task
The task does not apply if you are upgrading from ONTAP 9.1 or earlier.
Procedure
Check the status of your DNS servers: dns check -vserver vserver_name
An up status indicates the service is running. A down status indicates that the service is not running.
If the DNS server is down, modify it: dns modify -vserver vserver_name -domains domain_name -name-servers name_server_ipaddress