The next release of vSphere won’t include VMware ESX, so you may be unsure how to upgrade your ESX hosts to ESXi hosts. Unfortunately there is no magic bullet, and as with all upgrades, you should not rush into it without being prepared. In this article, I will provide a suggested methodology.
1. Understand the differences between ESX and ESXi
First, you need a good understanding of the differences between ESX and ESXi. The two hypervisors run the same VMkernel, but managing ESXi is different from management ESX. ( VMware provides a basic ESX vs. ESXi comparison on its website and a more detailed one in the ESX vs. ESXi 4.1 KnowledgeBase article.) ESX and ESXi used to differ considerably, but vSphere 4.1 addressed most of them and the two hypervisors are now on par with each other.
Read the full article at searchvmware.com…