I have Created a new domain useing a clean install of server 2008 and i install exchange and AD and DNS and my DNS memory usage in task manager is always over 300,000k this is really high compaired to server 2003 with the same zones. does anyone have any thoughts.

Hello,I am thinking this is because you have all this role plus exchange installed on a single machine. It is not recommended to install Exchange and AD in the same machine because of high memory usage etc.Isaac Oben MCITP:EA, MCSE

Hello Shawn, Thank you for posting here. Based on the experience, the high Memory usage for DNS that is over 300,000k is not normal. For the server memory performance issue, we need to analyze the performance log and Dump file if you want want to know the root cause of the issue. Since the forum is not the best channel to troubleshoot this issue, I would suggest that you contact Microsoft Customer Support service to troubleshoot this issue efficiently. They are the best resource for this kind of issues. You may obtain the phone numbers for specific technology request please take a look at the web site listed below: http://support.microsoft.com/default.aspx?scid=fh;EN-US;PHONENUMBERS Meanwhile, you can also use Reliability and Performance Monitor to monitor the issue. Windows Reliability and Performance Monitor http://technet.microsoft.com/en-us/library/cc755081(WS.10).aspx Windows Performance Monitor http://technet.microsoft.com/en-us/library/cc749249.aspx besides, What Isaac said is right. It is not recommended to install Exchange server on the domain controller. If possible, please separate the roles into different machines, and then check to see whether the DNS memory usage will be still high. Hope the issue will be resolved soon.This posting is provided "AS IS" with no warranties, and confers no rights.