You can start or stop IBM HTTP Server using the WebSphere Application Server administrative console or using other methods depending on your platform.
You can configure your operating system to allow the log file for
the IBM HTTP Server plug-in to exceed the typical two gigabytes size
limit. To enable this functionality, add the USEPLUGINLARGEFILE environment
variable to your operating system configuration settings, and set
it to true, before you start the IBM HTTP Server. If you do not add
this environment variable to your operating system settings, or if
you set this environment variable to false, the log file is limited
to 2 gigabytes.