Telecommunication industry believes that the video-on-demand market will expand heavily in the near future. The service providers are interested in the deployment of video-on-demand (VoD) systems with large numbers of videos. As the number of videos and customers increases at a VoD system, two problems are faced. The first problem is the manual video allocation of multiple copies of videos to the disks, called video placement. The second problem is where to forward a newly arrived request to play a video so that the dynamic loads amongst disks or arrays of disks of video servers are balanced. Video-on-demand (VoD) has become one of the essential parts in telecommunication industry and the most crucial service of the broadband network applications. An important issue in the design and operation of the VoD system is to distribute the movie traffic load evenly across the disks in the system. In this paper, we provide a survey on the existing Load Balancing architectures, their performance and identify their tradeoffs, based on the analysis of an existing deployment of a Video on demand service.