ad replication status tool and dcdiag

Can anyone let me know what (in low tech management freindly termns) ad replication status tool and dcdiag are actually testing for? And the actual risks if they find what it is they are testing for? Please enlighten me. Are they easy to run? And how are the results presented?
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pma111Asked:
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Kash2nd Line EngineerCommented:
from MS website >> The Active Directory Replication Status Tool (ADREPLSTATUS) analyzes the replication status for domain controllers in an Active Directory domain or forest. ADREPLSTATUS displays data in a format that is similar to REPADMIN /SHOWREPL * /CSV imported into Excel but with significant enhancements.

Specific capabilities for this tool include:

    • Expose Active Directory replication errors occurring in a domain or forest

    • Prioritize errors that need to be resolved in order to avoid the creation of lingering objects in Active Directory forests

    • Help administrators and support professionals resolve replication errors by linking to Active Directory replication troubleshooting content on Microsoft TechNet

    • Allow replication data to be exported to source or destination domain administrators or support professionals for offline analysis


http://technet.microsoft.com/en-us/library/cc776854%28v=ws.10%29.aspx << DCDIAG
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pma111Author Commented:
Can you help put this into a risk context for a non AD admin. If there are replication issues, or issues flagged up by dcdiag... whats the risk to the network/company?
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Mike KlineCommented:
They main issue would be "availability" so if a DC is not replicating or down then it is not available.  If that DC is in a site with many DCs then probably not a huge deal to the end users.

If you have sites with one or two DCS only (very common for remote sites) then users in those sites will be affected as a DC would be down.

Also often times replication issues and other issues found might point you to find other issues such as networking/DNS issues.

Thanks

Mike
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SandeshdubeySenior Server EngineerCommented:
What does DCDIAG actually… do?
http://blogs.technet.com/b/askds/archive/2011/03/22/what-does-dcdiag-actually-do.aspx

Repadmin Overviewhttp://technet.microsoft.com/en-us/library/cc755360(v=ws.10).aspx
Repadmin Examples:http://technet.microsoft.com/en-us/library/cc773062(v=ws.10).aspx

If there is replication issue between Dcs.There could be multiple issue which you may experience like authentication issue,access to resources,etc.

If you FSMO role holder server is down for few minutes then there should be no impact.However if it down for many hour then you can have impact.
 
If the FSMO role holder cannot be bring back or taking long time you can seize the role on other DC.
 
There's some info on FSMOs and what would happen if any specific FSMO is down for any length of time, permanently or termporarily.
 
Active Directory FSMO Roles Explained and What Happens When They Fail and Why you may not be able to keep a DC up once roles were seized.
http://msmvps.com/blogs/acefekay/archive/2011/01/16/active-directory-fsmo-roles-explained.aspx
 
Hope this helps
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