WMI Performance Issues and hotfixes

Hi Gabriel,

Here is a good article from MS on WMI issues.

http://blogs.technet.com/b/kevinholman/archive/2009/06/29/getting-lots-of-script-failed-to-run-alerts-wmi-probe-failed-execution-backward-compatibility-script-error.aspx

Of particular interest are these three items:

1. Apply http://support.microsoft.com/kb/933061 This resolves a LOT of issues on the Windows 2003 OS with WMI. This should be one of your first steps. This applies to x86 or x64 Windows Server 2003 SP1 or SP2.

2. Registry modification for WMI buffer thresholds (see below)

“HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM\Low Threshold On Events (B)" to 35000000 (default is 10000000)
”HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WBEM\CIMOM\High Threshold On Events (B)" to 70000000 (default is 20000000)

The registry modification to WMI buffers increases the amount of objects that WMI can hold before injecting sleep delays to the WMI service.

3. Apply http://support.microsoft.com/kb/955360 This updates the Windows Scripting Host (cscript) to version 5.7. This resolves script timeouts, and scripts consuming a LOT of CPU during execution, and problems with multiple scripts running at the same time. This applies to x86 or x64 Windows Server 2003 SP1 or SP2. This is a very good hotfix for DNS servers, DHCP servers, and Domain Controllers. This has been seen to lessen the impact of VBscripts consuming a large amount of CPU during runtime.

I will do some testing and let you know if it helps at all.

Thanks.