Resolution
Does Directory and Resource Administrator have the capability to fail over to a different domain controller?
goal
How do I configure DRA to fail over to another domain controller if the preferred domain controller is unavailable?
goal
Can the domain controller setting on the DRA server be extended to two or more backup domain controllers?
goal
How do I set up multiple backup domain controllers for fail-over?
fact
Directory and Resource Administrator 7.x
fact
Directory and Resource Administrator 8.0
fix
Directory and Resource Administrator (DRA) does not currently have the capability to automatically fail over to a different domain controller (DC). DRA connects to one domain controller for all Active Directory changes. If this "preferred" domain controller is restarted or becomes unavailable, you must manually point DRA to a different DC, forcing an accounts cache refresh.
An Enhancement Request has been opened with Development to include this functionality in a future version of Directory and Resource Administrator.
note
Whenever you point DRA to a different DC, DRA must refresh the accounts cache. DRA cannot assume the current cache is valid for another DC in the same domain because there is no guarantee the domain controllers have the same information at any point in time.