Firstly: Please renumber the steps using a global to the document sequence number so anyone can refer to the steps in an email message; in my notes below I can't give you clean references because your document does not have them.
If I were to report to support "I'm having problems with step 4" would they be able to find the one paragraph in your document that is numbered '4'? or did I really mean Step4?
I think the whole section up to "Upgrade your servers product-by-product" is something that applies to either all upgrades or a re-clone upgrade? Either way I'd start by assuming whoever is doing an upgrade has a working FOE install and simply wants to upgrade one module. It simplifies the document, and all of the stuff in there about NIC ordering, anti-virus, etc. has never been an issue I've encountered in doing an upgrade.
I'd STRONGLY recommend anyone with a large install only upgrade one module at a time.
You've turned off the secondary server at a step 4 -- I think you have copied this from a different install document
Then, later the instructions tell me to make it active, will not work if you followed the previous instruction
The step to actually upgrade the primary server is missing from the document (somewhere in step 2 between 3 and 4-- I would like to be able to give you a clean reference, but I can't because of the lack of good numbering)
Sorry I'm not more positive about this.
Quite alright, Richard! FOE upgrades can be extremely complicated. We're working to get this documentation in an easier way. Feedback is greatly appreciated. I'm taking this to the doc, and working on updates. I'll post when the edits are done!
I've revised the content, working with SMEs for further reviews and usability. You may see additional changes throughout the day.