A method for manufacturing a primary preform for an optical fiber wherein conditions are created in the reaction zone such that one or more glass layer packages made up of at least two separate glass layers are deposited on the interior of the substrate tube. More specifically, the invention relates to a high performance, composite, tubular structure that utilizes an integral pattern of ribs on the internal diameter or outer diameter surface of the tube. The operating system executes as a guest under control of a virtual machine monitor.