We are in the process of migrating our servers to 2008 and fixing up/optimizing the network topology. As we do this we are deciding on RODC vs full on DC/GC's at each site.
Generally we have just one server at a site. Some sites are small (less than 25 users for the most part). In one of these locations I put an RODC. I demoted an old 03 DC that was failing and had some trouble but it eventually went down gracefully.
In this site (SiteFarAway) I have the server as an RODC, the Site itself has Universal Group Membership Caching on. It is NOT a GC. Based on the physical topology I have one connection (RODC Connection (FRS) ) to a single DC at site MainSite. The KCC hasn't added any more connections. Should I establish another connection to the RODC in case the source DC goes down? When I go to manually make the connection it sets up 'regular connections' not the RODC Connection that was created when I did dcpromo on the RODC.
The 'from site' contains more than one DC. I imagine that after a period of time the RODC would switch it's connection from the one DC to another DC in the source site. Does that sound correct?
I have read several different views on this and I couldn't find a definitive answer. On the RODC I noticed that AD activities can be 'slower' - Sites and Services, etc - they are all pulling from the source. Users say logins are about the same and on-site file shares, printing etc are speedy.
Does this sound like a good setup?
Group Caching on
From DC is located in a site with multiple DC's for failover