I am having 6 HP DL Servers. I have created 20 VMs on 3 of my servers. This VMs work as database servers, another 3 physical server work as an application server (Terminal Server) where all the user login and work remotely. Currently, I am using VMWare workstation for virtualizing.
Now I need DR and high availability features, hence I am looking forward to Vmware ESXi, but I am not able to decide which all VMware licenses should I have to fulfil my requirement.