Will making your exchange server a secondary DNS and Global Catalog server increase performance?

I'm busy doing some research on various ways to increase performance on exchange servers and I have a question. Will making your exchange server a global catalog and a secondary DNS server increase performance? My question is based on the fact that exchange authenticates the end user with AD first and then routes the message via DNS.

If you have any other information on ways that I can boost performance then please let me know!
technolutionsAsked:
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Chris DentPowerShell DeveloperCommented:

Hi,

Running the two roles (Exchange and DC) on the same machine is more likely to degrade performance that increase it. After all, both AD and Exchange are types of Databases. They rely on the same hardware subsystems to perform well.

But, if Exchange is already a Domain Controller then it should be made Global Catalog (if it isn't already).

If Exchange is not a Domain Controller at the moment then it should not be promoted. That change is not supported (by MS) and while it might work, if it doesn't you're not in a good place.

Conversely, and because it should be noted. If Exchange is a DC it should also not be demoted.

What kind of performance issues are you suffering from? The most common is disk-related, slow database access.

Chris
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technolutionsAuthor Commented:
Well, I'm not suffering for anything but thanks for asking. I'm writing my second Enterprise Messaging Admin exam and I'm doing alot of research at the moment. Which is why I am so interested in various ways to improve performance. Got any suggestions for me?
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