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Gad SAADIAFlag for France

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Windows 2012 2008 DNS

Hello

Here my configuration
3 DCs servers

Server1, Windows 2012 R2, DNS, DHCP, DC with 4 FSMO roles
Server2, Windows 2008 R2, DNS, DC
Server3, Windows 2008 R2, DNS, DC

IP config of the 3 servers is as follow :
Server1 : DNS1 = Server1, DNS2 = Server2
Server2 : DNS1 = Server2, DNS2 = Server3
Server3 : DNS1 = Server3, DNS2 = Server1

Sometimes it happens that for internal reasons we have to shut down all 3 servers for many hours.
My problem is that I do have problem for restarting DNS on servers when turning them on.

The DNS Service starts OK but DNS configuration is not retreaved and it asks me to to create a new DNS server of something like that

My questions :
Is my DNS IP configuration correct ?

When all 3 servers have been shut down, Is there « an order » to turn on servers, one after the other, or all 3 at the same time ?

Is there a way to retreive DNS config and not playing with IP DNS addressing  ?

Thank you
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If you are shutting down all three servers simultaneously, you will always have a delay bringing the first one back up. Not just because of DNS. It will try to contact other DCs to see if any changes have occurred and when none reply, it will not consider itself valid. Because it is not valid, no AD integrated DNS zones will be available either. It will wait until other DCs are up, and they compare replication states.
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a shutdown and a power on after 12 hours will not affect your dns.. I've had virtual machines powered down for days with no dns errors.
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thanks to all