Parallels Virtualization and Automation Software

SYMPTOMS

I configured Performance options for my domain at Domains -> yourdomain.com -> Performance, however the connection speed is still high enough and number of simultaneous connections can be exceeded.

CAUSE

Apache module bw_module that is responsible for assigning a maximum (or fixed) bandwidth available to a vhost is missing.

RESOLUTION

Verify that package mod_bw is installed and the module is loaded in apache configuration file.

For Linux:

/etc/httpd/conf.d/bw.conf
..............
LoadModule bw_module /usr/lib/httpd/modules/mod_bw.so
..............

For FreeBSD:

/usr/local/etc/apache2/httpd.conf
..............
LoadModule bw_module          libexec/apache2/mod_bw.so
..............

Package mod_bw is included into Plesk dirtributive, it can be installed using Plesk Control Panel or command line Plesk Autoinstaller, the component is Bandwidth Limiter For Apache support (mod_bw).

Also it is located in directory /opt/bw/ of Plesk tarball that is  available at http://www.parallels.com/en/download/

If the package is installed but bandwidth limiter still does not function, verify that the module is enabled in apache.