2nd DC gone down

jag b
jag b used Ask the Experts™
on
Hi Guys ,
My DC2 has gone done (hardware fault)  - details below:
DC1 - Roles:  AD / DNS / All FSMO roles - Global Catalog enabled
DC2 - Roles: AD / DNS (copy of DC1) / DHCP -  Global Catalog enabled

can i add the new role DHCP on my DC1 and just authorize it?  Then would i just take the DC2 off the network and clean up AD via Metadata?  or is it best to by another server hardware and bring the server back up via backup?
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EE Solution Guide - Technical Dept Head
Most Valuable Expert 2017
Commented:
Even if you restore from backup you will have few errors/warnings.
Instead install another ADC and cleanup the failed DC

https://www.petri.com/delete_failed_dcs_from_ad
https://technet.microsoft.com/en-us/library/cc816907(v=ws.10).aspx

Do you have backup of your DHCP? If not you have to configure DHCP from scratch and authorize.
If you have backup just install DHCP role and restore DHCP backup.
https://community.spiceworks.com/topic/342341-how-to-backup-dhcp-configuration-and-restore

Author

Commented:
Hi Mas,
I have full backups of all servers - what location would the DHCP files sit on the server?

i think ill go with cleaning up the failed DC and create a new ADC...
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017
Commented:
Please mention the version of server version were running
Please check this.
https://technet.microsoft.com/en-us/magazine/ff621490.aspx
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Author

Commented:
Hi mas - running Server 2012  -i think i found the DHCP folder on my backup - location %SystemRoot%\System32\DHCP
Thanks Mas - im just installing the DHCP role now on the DC1 - will keep you updated

Author

Commented:
Mas - dhcp all working now thanks.
Now cleaning up the old DC metadata - would you suggest clean the whole server with all reference and when creating new DC - rename with new IP & computer name - or keep the same IP & computer name?
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Commented:
If you assign the same name and IP it will not give you anything additional instead it may give you errors/warnings in future.

Author

Commented:
Mas - so best to start with with a new DC - new name & IP?
MASEE Solution Guide - Technical Dept Head
Most Valuable Expert 2017

Commented:
Yes please
If you are good in cleaning AD database you can else please don't think of keeping same name and IP.

Author

Commented:
excellent advice :)

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