I had a ESX host that would give me the following error when I ran my config mpath.
#config_mpath –primary –loadbalance –policy fixed
Your DNS is improperly configured.
The following storage system hostname(s) could not be resolved:
After the DNS issues are resolved, you must properly
configure the preferred paths for NetApp storage systems
by running the following command:
/opt/netapp/santools/config_mpath –primary –loadbalance –persistent