What is the best way to upgrade an HA pair from 12.x to 14.x in a production environment?
We have two BIG-IP virtual devices in an HA pair that were handed over to my department to manage after they were set up by our engineering department. They're currently on version 12.x and we'd like them to be up to version 14.x and deploy new devices later also on one of the latest versions to reduce any known vulnerabilities in older versions.
Since they are currently in production and processing a lot of traffic, we need to minimize downtime.
I've seen recommendations saying to do upgrades to major point releases and I've seen that it can go from 12.x to 14.x in the 14.x release notes.
While it would be best to have less downtime, I'm more concerned about doing things the right way, the downtime can be forgiven.
I'm learning all about this the best I can and have had a few days of training sponsored by F5 but I am still unsure about how to go about doing this.
Thank you in advance for any help and guidance.