asked on
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Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).
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The AD team has a good blog with examples http://blogs.technet.com/b/askds/archive/2009/07/01/getting-over-replmon.aspx
There is also a repadmin whitepaper you can find
repadmin /showrepl * to get you started
As far as performance
You can use collector sets, another good blog http://blogs.technet.com/b/askds/archive/2010/06/08/son-of-spa-ad-data-collector-sets-in-win2008-and-beyond.aspx
If you want to take it to another level you can collect your own logs. Now how do you analyze those logs if you don't do it every day.
There is the PAL tool written by a Microsoft PFE that can help http://pal.codeplex.com/ it can help you with thresholds. Take a look at the screenshot from my lab. Again you would need to provide the log file.
With three DCs you probably won't have a lot of perf issues on a smaller network. Make sure to have enough RAM to cache AD (ntds.dit)
Thanks
Mike