Use the “iSNS Server Management” RBAC profile to obtain the authorizations needed for managing the iSNS service.
Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.
List the discovery domains to identify the one you want to remove.
#isnsadm list-dd -v
Remove the discovery domain from the discovery domain set.
#isnsadm remove-dd set_name domain_name