We have a virtual environment with Vmware Esxi 4.1 which we would like to upgrade to 5.5. In my location, there are 5 IBM x3650 M3 servers. One is a dedicated Vcentre server which I also need to upgrade. Then there are four servers part of a cluster.
And then there is just one on its own in a remote location that is on Esxi 4.1.
In terms of procedure and best practice, what's the best way to do this? Should I shut down all servers when doing this upgrade? Do we need to make any changes to the SAN datastores or is that something that is automatically picked up during the upgrade process?