If you use VMware vCenter Foundation – this tip could be useful. VMware released an update to VMware vSphere 6.5 in July 2017. vSphere 6.5 Update 1 provided some general updates and enhancements, including all the security and bug fixes that were part of 6.0 U3; removing some of the concerns that customers had about upgrading. You can read more about the update here.
VMware also announced that the number of nodes that vCenter Foundation Edition can manage was increased from 3 to 4.
This is a minor improvement, but may be useful with smaller environments where an extra node could make a big difference.
However, please note that when adding on a further node, you may potentially have to purchase a new vSphere license and a Microsoft Windows Server Datacenter license.
Further information about this announcement from VMware can be found here.
Note : The Essentials Edition of vCenter is still limited to 3 nodes and ESX Essentials or Essentials Plus, can only be managed by vCenter Essentials due to technical limitations.