Upgrading 2003 R2 x64 server to 2008 R2 - clean install or Upgrade
Just want peoples views on this...
I have got 3x dc's left on 2003 R2 x64 at the mo and im unsure if i should do a clean install or upgrade. I know about decommissing them before doing the upgrade, moving the fsmos and i have already run adprep for domain, forest and gp levels and i have just made a 2008 r2 machine a temp DC just incase.
Now, 2 of the DCs in question are DNS's. Would an upgrade run smoothly or would i have to move the DNS's for a day while the upgrade takes place? 1 of them runs Backup exec 12 so that will have to be removed and new backup software will have to be considered (which i am open to all options) and also MLS eclipse (which again needs backing up before i do anything and will need SQL express 2008 installing in the end).
Can anyone offer any advice?