The Study On Application Of Network Storage Technology In The Television Broadcasting System

Along with the television program transition from standard definition to high definition, a lot of bit-rate broadcast material and videos occupy the broadcast server valuable storage space. Therefore, how to establish a relatively low-cost secondary storage system which is easy to manage between the media information system and video server in the network television broadcasting system needs to be studied and solved.In the previous television broadcasting system, they used fiber-channel switches as the core to build a broadcast network. But there exists a problem of poor compatibility with Ethernet and other heterogeneous systems. It leads to the storage system can not be shared with other servers. And stored program material can not be utilized by other broadcasting system as well.The goal of this study is to design a network storage system which is able to overcome the above disadvantages and accord with high definition broadcasting system standard.In the overall design of the new broadcasting system, it uses Gigabit Ethernet and tiered storage. According to this system model, the paper estimates the secondary storage system disk capacity and network bandwidth requirements. Taking into account the broadcasting system will use all the hard disk, recording systems and automatic control network are canceled.Migration system in standard definition television broadcast system took on the task of storage system metadata and content collection. There also exists a problem of multi-task and business process unreasonable. New network television broadcasting system adds a migration policy server to replace recording system, which has unified management of metadata and program material. At the same time, the business processes of the migration system are re-designed. The program material can be moved back from secondary storage system. Editing playbill workflow and web serverworkflow will be optimized too.At the aspect of storage hardware, disk cabinet replaces the distributed storage servers. All disks which are configured with two storage controllers are set to two disk cabinets and each disk cabinet has a hot spare disk. It uses large-capacity fiber-channel disk to replace the original SCSI disk. After adding two file servers connecting with disk array, cluster file system is used to achieve system data sharing. When the fiber-channel switches are canceled,file servers and disk arrays connected directly to the memory controller. In this way, they can eliminate the delay caused by the bus or switch. Finally,file servers replace the metadata server and metadata share channel with program materials. The hardware structure becomes further streamlined.In the implementation of the new secondary storage system, this paper also designed two test programs which test the performance of the new secondary storage system in order to ensure that the new system meet the design requirements.In the end, we achieve a data sharing with secondary storage system and materials of media information system can be automatically migrated to secondary storage system. When the secondary storage system architecture is simplified, broadcasting system is becoming more and more openness and flexibility. The design of the network broadcasting system has been applied to the new high definition television system. It is stable when the system was putting into use since December 2012. And the broadcast quality has been recognized by the majority of the audience.