Is there a best practice document for upgrading the OS/Rebuilding a primary server running on windows ? We currently have 4 primary servers on Windows 2008R2 and a SQL server also on 2008R2 running SQL 2008 and would like to upgrade the server os's to 2012 R2 or 2016 if possible, is it easier to just rebuild the server but call it the same name and reinstall zenworks ? What effect will that have on the zen db ? Has anyone done this ?

Thanks in advance