I have recently inherited two ESXi 5.5 server, hosting 5 VMs on each server. We have a need to be able to migrate the VMs between servers, as well as backing up the VMs without having to take them offline which I am assuming means converting the ESXi servers into true ESX servers?
Is the servers that they are running on are 2 x six-core CPUs, is there a specific SKU that I would need to purchase in order to turn the servers into 'true' ESX servers with all the features that I would require for them to be truly 'enterprise' usable?