So, after finding out how bad it was at this new role when it came to updating their firmware and hosts, I've now got the pleasure of doing it. They have accepted that it's pretty bad but we're also running a version of 6.5 from November 2016........
So, my question is this, I need to know the best way to update these boxes, I'm doing the entire firmware stack for all the hardware and then grabbing the latest esx 6.5 version and then bashing through the entire cluster.
I'm thinking this
Drop the server into maintenance mode, actually, manually move off the VM's and then go to Maintenance mode. I put one in 3 days ago and it purple screened.
NExt up, update the hardware BIOS
Then update the OS
Bring it out of maintenance mode
Move the VM's back, move onto the next host. Rinse and Repeat.
Is this is the best way to do it or is there a better way?