I have 4 DC's to upgrade.
DC1 - Server 2003 -- FSMO: Domain Naming Role -- DHCP & DNS Secondary
DC2 - Server 2008 R2 -- DHCP & Primary DNS
DC3 - Server 2003 -- FSMO: Schema master, PDC, Infrastructure, RID
DCX - Server 2008 R2
I would like to get all of the DC's up to Windows Server 2012. I know I have to get the Server 2003's up to 2008 R2 first as well.
My issue is I am unsure of how to do the upgrade and preserve the other roles on the servers. In-place upgrades are always an option, but seem to work sometimes and other times don't.
So would I need to pass off the DNS roles to other servers somehow along with the DHCP?
Everything is actively being used, so I'd like to find a plan with as little downtime as possible.
I'm open to any and all suggestions.
Thanks for any help!