During pass year my secondary AD server running on windows 2003 server CPU spike to 100% 2 times once at Oct and another one is on Dec at same time 8.00AM. This AD server also is for authenticate wireless user. Once rebooted it's back to normal. My management request to invetigate the root cause. Perhaps you guys expert out there can advice me how to find the root cause.
What I've done is follow the advice from technet from Microsoft "Troubleshooting High CPU Usage on a Domain Controller" from this link http://technet.microsoft.com/en-us/library/bb727054.aspx
and I've checked the process and found svchost.exe PID984 is the one that make the CPU spike to 100%.