Active directory-BDC

We have 2 domains I will call them here DC1 and DC2.
My AD is Windows 2012 infrastructure.
About 10 days ago DC2 started acting out kept freezing (Win 2012 R2). We did everything what was possible- rebooted the switches, server numerous times. I also removed antivirus software and then after a while server was OK for the next few hours and then was frozen again. I did reinstall the antivirus product which was always working properly .
Is there any command which is required to check if my environment my forest is ready for the newest version of AD (Win 2016)?
Should I bring to the environment a new win 2016 server DC3 first make sure everything is working OK replication, run health commands etc.
After few days should I demote DC2....if it allows me....???!
mirekgAsked:
Who is Participating?
 
Mai Ali (MVP)Connect With a Mentor Senior Infrastructure ConsultantCommented:
You can check the health of a Domain using DCDAIG , Netdaig , Netsh , Repadmin Tool.

 Using DCDAIG Tool, you can verify following AD Components are working fine or not.

    Checking FSMO roles on a Domain Controller
    Troubleshoot Active Directory replication errors
    Check DNS registration
    Examine Domain Controller and verify it is functioning correctly.
    Topology Integrity
    Inter site Health
    Trust Verification
    File Replication Service.

You can refer below link
https://blogs.technet.microsoft.com/askds/2011/03/22/what-does-dcdiag-actually-do/
https://gallery.technet.microsoft.com/scriptcenter/Active-Directory-Health-709336cd#content

You can add on your environment DC3 with Win. 2016 but you don't need to remove DC2. Try to get logs from DC2 to check why it's frozen every time. Also Try to remove antivirus and leave DC2 without Antivirus for 2 days and check if it will freeze or not. if not, try to verify that open firewall and do exception for DC folders on antivirus
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ChethanTechnical SpecialistCommented:
1) Check the Forest Functional Level & Domain Functional Level
2) Check repadmin command: repadmin /showrepl
3) Get the full health check report by executing the command: dcdiag /c /e /v >>c:\DCdiagreport.txt
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mirekgAuthor Commented:
The real reason for my DC was antivirus which out of blue started "acting".Either way I've removed it and then installed different software..
Thank you,
M
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mirekgAuthor Commented:
Thank you all.
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Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Mai Ali (MVP) (https:#a42415482)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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