Parallels Pro Control Panel creates a Virtual Private File System (VPFS) for each site created. When you create a site, the file system for that site is populated with a default set of service files from a template. When a service RPM is upgraded, the corresponding service files present in the sites' file systems become stale as they are not automatically updated. You must synchronize the files in the site file systems with the RPM updates either by scheduling a periodic update using the scheduleMaintenance
script or by forcing an update using the synchronizeFST
script as described in the following sections.