I am in the process of upgrading from 5.0 to 5.5. The way I did this is I have a standalone vCenter VM. I cloned this (ran sysprep, etc) and then upgraded the clone so as not to touch anything we have in production.
When asked to upgrade the agents on the hosts, I chose that I will upgrade them manually at a later time.
So first question, are the agents backwards compatible with 5.0? Or once I upgrade them, will only vCenter 5.5 be able to connect?
What is the best way to rollback to the 5.0 agent if I encounter any issues after upgrading the agent to 5.5?
In my vCenter 5.5 web client, I was going to try to add the hosts anyway just to see if there was connectivity there (figuring an error message might tell me that much) but I don't see a way to manually add them. It appears when I select hosts, it starts scanning for them (and finds nothing which is what I'd expect).
I just want to make sure this appears to be behaving correctly given that there are no 5.5 host agents out there.
Thanks much for the help.