Were both hosts installed from scratch, or did you clone the ESXi hosts?
André
Yes i cloned the first onebut i changed the IP address of the second host .
I assume that you are aware that cloning ESXi hosts is not supported. You may be able to workaround the current issue with resignaturing one of the datastores (not sure though). However, if this is a production environment I'd recommend you re-install the cloned host.
André
Sadiq - can you try this one?
http://www.virtuallyghetto.com/2013/12/how-to-properly-clone-nested-esxi-vm.html