Thanks for your help,

  I am going to specify the NFS 4 domain  this weekend, but the question is:

 

after that, will i  still be able to mount an existing V3 export?, because i'm not going to translate my  V3
to V4 yet  and i dont want to impact my current NFS 3 environment

I'm going to use this command:

server_param server_2 -facility nfsv4 -modify domain -value nfs.gmodelo.com.mx

Best regards