A. If you're planning out a new AD implementation and need to estimate the size of the AD database for the purposes of sizing (particularly the amount of RAM required for domain controllers), Microsoft has the Active Directory Sizer utility. The utility lets you input information about the environment and gives an estimation of the AD database size, in addition to the number of domain controllers and global catalogs required.
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The utility is wizard-driven and asks numerous questions about the environment. It can also estimate number of logons expected and other factors. An example of the utility's output is shown here.
The tool can be downloaded from Microsoft's site.Related Reading:
- Q. Why are 64-bit domain controllers (DCs) better than 32-bit DCs?
- Q. Can I force my domain controller to cache my entire Active Directory (AD) database at boot-up?
- Q. How can I check how much of my Active Directory (AD) database is cached in memory?
- Q. How do you remove a read-only domain controller (RODC) from an environment that's been compromised?
Check out hundreds more useful Q&As like this in John Savill's FAQ for Windows. Also, watch instructional videos made by John at ITTV.net.