Decommissionig a Global Gatalog, Domain Controller properly

Greetings Experts,

I have a physical Domain Controller (DC) which is also a Global Catalog (GC) and DNS server  and I want to decommission and format him (currently Windows Server 2008 R2).

For that reason I created a Virtual DC ,GC and DNS Server and I transferred all roles and promote him as primary DC (Windows Server 2012 R2).

I was reading that is recommended ,before decommissioning a DC Server, to shut him down for a week or two, confirm that the new DC is working with no errors and following decommission the subject server.

Unfortunately I do not have this time for waiting since the server should be formatted and revert to production as soon as possible.
For that reason I have changed all the clients to point to the IP of the Virtual DNS in order to check how they operate and I also unchecked the physical Server from operating as GC.

Is there any other recommended method prior to decommission process in order to confirm that…..:
-       the physical DNS/DC is not being used anymore (does not have any records that could cause any errors once decommissioned)
-       The virtual DNS/DC/GC is working in his place
mamelasAsked:
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RantCanSr. Systems AdministratorCommented:
Set your DHCP lease time to a few hours, and ensure that the DHCP is handing out the new DNS. If you have transferred the FSMO roles to new DC, you can demote the old DC anytime.

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mamelasAuthor Commented:
Dear RantCan,

Thank you for your prompt reply.

The FSMO roles are already moved on the Virtual DC.
Will the replication between the Domain Controllers stop automatically after decommissioning the Physical Server?
Or should I stop it manually ?
RantCanSr. Systems AdministratorCommented:
DO NOT use manual intervention.

Use the DCPROMO command to demote the old DC; it will take itself out of commission. Here are some details.
https://technet.microsoft.com/en-us/library/Cc771844%28v=WS.10%29.aspx?f=255&MSPPError=-2147217396
mamelasAuthor Commented:
Thank you for your time!
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