Before using vMotion, you must configure your hosts correctly.
Ensure that you have correctly configured your hosts.
Each host must be correctly licensed for vMotion.
Each host must meet shared storage requirements for vMotion.
Each host must meet the networking requirements for vMotion.Important:
The ESXi firewall in ESXi 5.5 and later does not allow per-network filtering of vMotion traffic. Therefore, you must apply rules on your external firewall to ensure that no incoming connections can be made to the vMotion socket on TCP port 8000.
vMotion Across Long Distances
You can perform reliable migrations between hosts and sites that are separated by high network round-trip latency times. vMotion across long distances is enabled when the appropriate license is installed. No user configuration is necessary.
For long-distance migration, verify the network latency between the hosts and your license.
The round-trip time between the hosts must be up to 150 milliseconds.
Your license must cover vMotion across long distances.
You must place the traffic related to transfer of virtual machine files to the destination host on the provisioning TCP/IP stack. See Place Traffic for Cold Migration, Cloning, and Snapshots on the Provisioning TCP/IP Stack.