Hi guys
I had recently upgraded to vCenter Server 5.5 U2 and I would like to upgrade my remaining PROD cluster with ESXi 4.1.
What is the recommended approach in upgrading it to ESXi 5.5 with ZERO virtual machine downtime?
Virtual machines will be retained in this cluster.
All vswitch & datastore must remain unchange. I have also newly setup VUM on the environment that is not part of this old cluster.
Appreciate you feedback.