order to which I should promote with these 2 OSes

note: i'm new domains

i have 2 licenses: 2008 r2 , 2012 server.  we use custom piece of software in terminal services day in office.  it cannot run on 2012, have install on 2008 r2 file server.

i administrate domain using 2012 since seems easier use , software use run on 2012 anyway.

i'll have 2 boxes - 2008 r2 file server , 2012 box.

i want minimum of 2 dcs promote both boxes.  someone told me there no more primary , secondary domains (?) maybe doesn't matter...

should promote 2012 box (using 2008 r2 functional level) first , promote 2008 r2 file server box backup controller 2nd?  or, should promote 2008 r2 box , add 2012 dc 2nd?

there no primary , secondary dc since windows 2000. dcs rw except rodcs. however, dcs can holders of fsmo roles: http://www.windowsdevcenter.com/pub/a/windows/2004/06/15/fsmo.html

i recommend following order:

1. install first dc running windows server 2012 , make dns , gc server. dfl , ffl should windows server 2008 r2 or lower. windows server 2008 r2 recommended 1 in case allow enable ad reycle bin
2. install second dc running windows server 2008 r2 , make dns , gc server

i prefer order windows server 2012 dc holder of fsmo roles (which recommended) by default , there no schema extension if transparent windows server 2012.

you can promote first windows server 2008 r2 first later need transfer fsmo roles windows server 2012 server because recommended (extra work easy it). here, schema extension adds 2012 done in background when introduce new windows server 2012 server dc.

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