SharePoint 2013 Server OS upgrade from Windows 2008 R2 to Windows 2012 R2

Is it possible to have SharePoint 2013 farm to have mixed version of OS (Windows 2008 R2 and Windows 2012 R2).
We have a request to upgrade our farm servers from WIN 2008 R2 to Win 2012 R2. We have 5 servers in farm -
2 App servers - running with Central Admin, Service Applications, User Profile
3 Web Front End Servers- running web application, search and workflow manager
the database layer is separate on sql 2012 R2
We want to upgrade OS from windows 2008 R2 to windows 2012 R2 and SQL to SQL 2014.
What will be right approach to do OS upgrade in above scenario to minimize the impact of downtime.
May be add windows 2012 based servers in farm one by one and replace the windows 2008 R2 based servers from server.
Regards,
Kunal Abrol

Its possible, but I wouldn't recommend it. The problem is that you can only install SharePoint 20103 on Windows Server 2012 r2 using the slipstreamed SP1 version. I assume that you used the regular version to install on you Server 2008 r2 versions.
Even if you upgrade those servers to SP1 there are some minor differences in the builds between slipstreamed SP1 and upgraded SP1. So although it will work it isn't recommended.
Also, you should be aware the upgrade of inplace SharePoint servers running Windows 2008 r2 to Windows 2012 r2 is not supported.
To upgrade to server 2012 you'll need to add 2012 servers to your environment using the slipstreamed version os SharePoint and then remove the old server 2008 r2 servers as soon as possible. For the period of the upgrade you should be able to get away
with running the farm in a mixed state.
Paul Stork SharePoint Server MVP
Principal Architect: Blue Chip Consulting Group
Blog: http://dontpapanic.com/blog
Twitter: Follow @pstork
Please remember to mark your question as "answered" if this solves your problem.

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