Active Directory Limits and Scalability


A few days ago I had to search about this subject while planing to Raise Domain Functional Level from 2000 to 2003, and is always good to know the limits.

  • Maximum Number of Objects
    • Each domain controller in an Active Directory forest can create a little bit less than 2.15 billion objects during its lifetime.
  • FQDN Length Limitations
    • Fully qualified domain names (FQDNs) in Active Directory cannot exceed 64 characters in total length,
  • Additional Name Length Limitations
    •     NetBIOS computer and domain names are limited to 15 characters.
    •     Domain Name System (DNS) host names are limited to 24 characters.
    •     OU names are limited to 64 characters.
  • Trust Limitations
    • There is a limit of 999 Group Policy objects (GPOs) that you can apply to a user account or computer account.
  • Recommended Maximum Number of Domains in a Forest
    •     For Windows 2000 Server, the recommended maximum number of domains in a forest is 800.
    •     For Windows Server 2003, the recommended maximum number of domains when the forest functional level is set to Windows Server 2003 is 1,200.

You can read all about this subject here http://technet.microsoft.com/en-us/library/active-directory-maximum-limits-scalability%28WS.10%29.aspx.

Hope that this information can be useful

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About rodvars
Been working in IT Services/Consulting for the past 15 years. My main areas of work are planning, development, managing and administration System infrastructures focusing on optimizing user processes, enforcing business security, performance enhancements, high availabilty and infrastucture scalability.

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