SPDiagnosticsServiceBase.Update method

Causes the SPDiagnosticsServiceBase object to save its state and propagate changes to all servers in the farm.

Namespace:  Microsoft.SharePoint.Administration
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)

public override void Update()

Call this method immediately after changing the configuration of the service or setting diagnostic levels for a logging category. The method persists changes on the local server and propagates changes to the other servers in the farm.