I have an environment with 4 clusters totaling around 50 hosts. There are 2 clusters with intel based processor hosts and 2 others with AMD based processors. All hosts are running VMware ESX 4.1. My question is, in the new cluster, should I keep the environment consistent and install ESX 4.1 as well? Or is it fine to install ESXi 5.5? I know I will have to upgrade vCenter if I installed 5.5 but should I also upgrade the current hosts to 5.5 or they will work fine with 4.1? How about datastore and block sizes, would that all stay the same? How about licenses.
Thanks!