Hi,
I inform you that I have a little problem on the controller installation NSX 6.2 on my vCenter 6.0 U2, when I would install controllers on the new platform, after the creation of controllers on ESXi, it gives me the following error "the deployment failed during pending preparation of the NSX controller controller-8 - Timeout waiting for controller is ready ", then it removes the NSX_Controller, and I ask you please for your help and assistance to resolve the situation, and I inform you that before you contact I checked NTP, DNS, Firewall on ESXi, all is good, and i cleared the ARP Cache from physical Switch, but always the same error.
You will find enclosed the NSX log file, if you want to take a look. And I am very happy and glad you contacted again, and I look forward to install and use the new VIO 2.5.
There can be some possibilities:
Sounds like network connectivity issues between the network on which the controller is being deployed and NSX Manager. Could also be NTP.
This article is pretty comprehensive as well:
Deploying NSX-V controller failed and disappear from vSphere client – VMware Professional Services