I want to upgrade my esxi 4.1 to 5.1. Having not much experience with it I'm having problems to have VUM between my plugins listed. I have been downloading the iso image(5.1) but won't install,says that is a version issue problem, On the other side I can't download the iso for version 4.1. What for alternatives do I have to upgrade my esxi host? The machine needs to be upgraded remotely
4.1 can be upgraded to 5.1 under certain conditions. Was the 4.1 system originally built as 4.1, or was it upgraded from something like 3.5?
Your best approach is to boot the remote host with the 5.1 DVD (or .ISO).
Do you really need to upgrade to 5.1? If this is part of a cluster, just take it out of the cluster and do a fresh install.
If your VMs are stored on different storage (partition or SAN) then if you aren't worried about uptime, then you can just install 5.1 over the top of 4.1 and then configure the Host and add the VMs from the untouched storage.
If this is a standalone machine, do you need 5.1 at all - do you need any features or bug fixes?