We have a VMWare 4.1 ESXi environment. It has two hosts and a dozen VM's. I purchased a two additional servers with more horsepower (16 cores, 160gb ram). I installed the 1st new server with VMWare 5.5 ESXi. When I tried to add the host, it complained about the VSphere VCenter server could not add the new host. I assume that is because it is a 5.5 host.
My next thought is that all I need to do is upgrade the vcenter server. Is this correct. Do I have to upgrade the server and the client? Is the client automatically upgraded when you install the new server or visa versa? Have myself confused now.
Does this upgrade affect the VM's. Does it have to be done with the VM's offline?
Will upgrading or installing the lastest vcenter server affect the running vm's?