We are having a disaster recovery exercise soon. Scenario as follows:
1 forest domain with 2 active sites and a DR site.
Currently Site A (2 DCs with one DC holding all 5 roles) is in active replication/sync with Site B (2 DC). However in a disaster recovery scenario of site B to be down, a disaster site named site C with 1 DC will be up with a backed up data of Site B.
The DC with the5 FSMO roles will then be shut down (to create a scenario of FSMO role holder crashed). DC in site C will seize all roles.
Question is, after DC in site C seize roles, will it still be able to recognise other the other DC in Site A which is still alive? Or a restore is also needed for the DC in Site A? Basically what I'm trying to find out is that, if a DC seized all the FSMO roles, will it still be able to recognise other DCs in other sites and what needs to be done if it can recognize and if it can't does it mean we have to restore all other DCs?
Thanks in advance