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Move FSMO Roles prior to DataCenter Maintenance

Posted on 2010-08-19
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Last Modified: 2012-05-10
Single forest with Single domain.

Current FSMO roles are on one dc in hq. Primary and secondary DNS servers are also on additional domain controllers in HQ. Each site nationally has 2 domain controllers configured as global catalog and DNS.

DataCenter Maintenance in HQ will require complete shutdown of all systems.  Systems with failover capability will failover to colocation facility which has 2 domain controllers.

Thoughts on moving fsmo roles out to colocation facility during Datacenter maintenance. Any additional gotchas I have not thought about woul be appreciated!
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Question by:ClubColby
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Andrew Hancock (VMware vExpert / EE MVE) earned 43 total points
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check your replication is working beforehand

repadmin /replsum
dcdiag /v
check evenlogs

if all is in the green you are ready to go, with greenlight.

I usually use ndsutil (command line) rather than gui, seems more responsive!
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by:Mike Kline
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Also make sure if you have firewall rules setup the same at the colo facility.

How long will your datacenter be offline?

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by:ClubColby
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Datacenter will be dark for at least 10-12 hours.

All return green.

So recommendation is I do not have to transfer roles or stop replication for DCs in HQ?
Once I bring the HQ DCs back online I''ll also need to run the dcdiag /e /v , etc to confirm HQ DCs are replicated and healthy. Anything else? I know I am going to get an alert storm from SCOM after the maintenance completion even with all the DCs in MM.

Should I be concerned about replication or should I say lack of replication causing database corruption?

thanks ahead!
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by:Darius Ghassem
Darius Ghassem earned 41 total points
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Move the fsmo roles over to the secondary site. Make sure you have other DCs that are GCs.

Replication will be fine it should come back online after you start the DCs back but you should check the replication once they are backup. I would even manually replicate the servers to make sure they get updated data quickly. You would get errors in dcdiag when you bring the servers up since dcdiag will see the replication errors when the system was down.

replmon /syncall
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by:Andrew Hancock (VMware vExpert / EE MVE)
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oh, one last thing, make sure you've got good AD backup (system state!), even if it's NT Backup! before you start, just in case!
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by:ClubColby
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What could happen if I don't transfer roles to secondary sites?

Backups yes!  
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by:Darius Ghassem
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You can have Domain downtime if the DCs can not contact the FSMO roles these are critical for AD to function properly.
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by:Mike Kline
Mike Kline earned 41 total points
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10-12 hours  is not that much time and you should be ok (I'm guessing the data center is going to be offline during the weekend or evening when users are not there)

....having said that it is painless safe to move them.
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by:ClubColby
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Correct.  Datacenter will be down. We have other DCs for the domain at our colo facility in same city.
Those domain controllers and other satellite office domain controllers will be online. These are all on the same domain.  Since this maintenance will take place saturday morning to saturday evening user load will be low. One thing to note is that we will fail over our exchange services to our colo facility so that email will continue to function while our datacenter at HQ is dark.
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by:Darius Ghassem
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You need to have the fsmo roles online with Exchange running and other services.
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by:Glen Knight
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This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.
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