We are currently running SL5 and need to upgrade this to SL7 (latest release). Apparently this requires a clean install. I have limited access to the actual rack. I will attempt to do this all remotely if at all possible. I've already backed up all the important data.
Here is the setup: 1 gateway node 9 worker nodes
My first goal is to upgrade one of the worker nodes only. What exact steps do I need to take to get the process started and do this as efficiently as possible?