NFS mount behavior in HA cluster

Hello,
Can someone explain me how NFS will work with HA cluster. In failover scenario ? More specific :
I have mounted my resources like that:
mount -t nfs -o vers=3,proto=tcp,nolock $server:/ $mount_point where $server is my Active NameNode ip.
Everything works fine. but suddenly some kind of error happens and my StandBy NameNode become Active NameNode ,
and my mount won`t work , I’m right ?
If I’m wrong correct me with some doc`s
Best regards , Daniel