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Similar to this question, Logging DNS requests on a windows DNS resolver, I am curious how much of a performance hit/impact enabling DNS Debug Logging will have on a server. Per the Microsoft links, http://technet.microsoft.com/en-us/library/cc776361%28v=ws.10%29.aspx, they all state that there will be an impact but not how much of an impact.

I realize that the amount of items that you turn on for logging and how busy your DNS server will be are important factors; however, I was curious what an average impact is that one can expect by turning on the logging.

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No noticeable impact for my network - Server 2003 R2 virtual machine with ~3000 clients hitting it logging both Send and Receive. It rolls over when it hits the specified size, I keep the files at 500 meg.

I measured query latency before and after and did not see any change. It does hit your disk a bit but it's sequential and easy to cache data.

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  • Do you forward those log onto a centralized logging server/appliance?
    – John
    Aug 27, 2013 at 19:41
  • No, I'm in the process of moving clients off the Windows boxes, 99% of our DNS traffic will be through a pair of Bind 9 servers with only DDNS registrations etc hitting the DCs. Eventually I'd like to but the format of those logs would take some serious sed skills to make easy to read. Aug 27, 2013 at 19:43

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