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If DC goes down then how to take it up

I have DC and ADC in my domain. on DC all the gp and other things like shared my docs. DC is creating problems now a days, we are planning to format it. I have taken backup of system state and other data. If I am right system state also have backup of group policies. Please correct if I am wrong.
I know when DC will down, ADC will take over the necessary AD services. but when I create DC again. and will put in to production then how will I make it again DC. do I need to make some changes., I am not able to ask questions as not able to guess what are the things I need to take care of. I think you guys now have the idea what I want to know, please help me out. it will be good if you can provide kind of steps or instructions which I should take care.
3 Solutions
Mal OsborneAlpha GeekCommented:
Best bet here is to temporarily add another DC, make it a GC & promote it to hold all FSMO roles, then rebuild the original box and do the same.  Any only PC you have laying around should suffice.
Here is the general process you will have to do:

1. Transfer all FSMO roles to the additional DC
2. Make the extra DC a global catalog
3. Create a DFS share that spans both servers to host the share folders and files
4. demote the original DC
5. Temporarily power down the original DC to make sure you have all necessary resources off of it
6. If everything seems ok, take a full backup of the server just in case
7. Format the server and do as you wish.
System state takes backup of SYSVOL so your GPO's is included.

Just to add some to OriNetworks step-by-step:

Make sure your additional DC also serve DNS (AD integrated will make it easier for you).

Check that replication was succesfull before demoting -> Event log or "repadmin /showreps"

Run "netdom query fsmo" and "dsquery server -isgc" from cmd to be sure all FSMO and GC is transfered to your additional DC.

Shiv3Author Commented:
Thanks to all for all your valuable replies. I was not well so was not able to reply and check the things you guys suggested, I will try them and will let you know.

Thanka again.

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