Our Qlik environment is currently on five Win 2012 servers. The organisation wants to upgrade all Win 2012 machines to Win 2019, but can't do them all at one time and so the five servers will need to be upgraded one at a time.
There can't be any downtime for the process so my question is: would there be any issues if different servers in the same Qliksense environment were on different OSs?
Would we need to turn off the Win2012 servers until all were upgrades to Win 2019?
Does the order of the server upgrades matter? So, would we need to upgrade the Central server first or should we eave it until last?
