Hi,
Got the request to upgrade SharePoint servers from window 2008 to window 2012 R2. We have 4 servers in farm .
1- 2 App servers - running with Central Admin, Service Applications, User Profile
2- 2 Web Front End Servers- running web application, search and workflow manager
3- database in Separate Server
4- SharePoint 2013 service pack SP1 already installed in current environment
What will be right approach to do OS upgrade in above scenario to minimize the impact of downtime.
Regards,
MS