I am an ESXi novice in charge of three Dell Poweredge servers with two to six VMs on each host. Each host has two datastores and boot from a USB memory stick using hard drive emulation.
I am updating them interactively using a DVD with the iso burned to it.
One of the choices given is to Install (default) or Upgrade.
My past experience in the PC world, when given that choice when installing a MS OS, I would opt for a clean install vs. an upgrade, mostly to keep any ghosts out and help me to isolate any issues that may arise.
What are the differences between the two and why should I choose one over the other?
If I install, will I loose access to the existing datastores and the VMs on them? What settings, if any, am I likely to need to reapply?
What are the cons of an upgrade?
Any, and all, advise is greatly appreciated.
Thank you.