I am working on a project to upgrade / migrate my 2008 R2 CA to 2012. I have a Enterprise Root CA and a Subordinate CA. I am following the standard migration plan of standing up 2 new servers and backing up the CA, removing the ADCS role, demote server, change server to workgroup, then on new server change host name to source CA, join domain, install ADCS, restore CA.
The question is which CA do I do first the Root CA or the Subordinate CA, or does it matter since they will have the same host names as before?