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Database server as secondary domain controller - acceptable?

We currently have an SBS 2003 box as our primary domain controller (also running Exchange and file shares).  We also have two Windows 2003 Standard R2 servers on the network:  one runs Oracle 10g and holds a database used by about 9 people; the other runs MS SQL 2005 and hosts our Microsoft Dynamics CRM database, accessed frequently by about 12 people and infrequently by another 15 or so..

I would really like to add a secondary domain controller to the network for fault tolerance reasons.  Would it be acceptable to make one of the database machines a secondary domain controller?  Would I expect to see much of a performance impact?  I am under the impression that, in an organization as small as ours (approx 55 users) that the DC-related activity on a server would be extremely small.

Can someone please tell me if I am correct in my thinking, and provide any recommendations?

Thanks in advance!
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Brian Pierce
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I was thinking the effect would be minimal as well because, as I mentioned, the database systems are only accessed by a handful of people regularly and the amount of data being updated is relatively small.