公开(公告)号：US6061504A

公开(公告)日：2000-05-09

申请号：US661152

申请日：1996-06-10

申请人： Percy Tzelnic ,  Uresh K Vahalia ,  Dennis P. J. Ting ,  Lev Vaitzblit ,  Wayne W Duso ,  Kannan M Alagappan ,  John Forecast

发明人： Percy Tzelnic ,  Uresh K Vahalia ,  Dennis P. J. Ting ,  Lev Vaitzblit ,  Wayne W Duso ,  Kannan M Alagappan ,  John Forecast

IPC分类号： G06F11/14 ,  H04L29/06 ,  H04L29/08 ,  H04N7/173 ,  H04N21/218 ,  H04N21/231 ,  H04N21/239 ,  H04N21/472 ,  G06F15/16

CPC分类号： H04L67/1095 ,  G06F11/1461 ,  G06F11/1464 ,  H04L65/1063 ,  H04L65/4076 ,  H04L65/4084 ,  H04L65/602 ,  H04N21/2182 ,  H04N21/23106 ,  H04N21/2396 ,  H04N21/47202 ,  H04N7/17318 ,  H04N7/17336 ,  G06F11/1456 ,  G06F11/1458 ,  H04L29/06027

摘要： A video file server includes an integrated cached disk array storage subsystem and a plurality of stream server computers linking the cached disk storage system to the data network for the transfer of video data streams. The video file server further includes a controller server for applying an admission control policy to client requests and assigning stream servers to service the client requests. The stream servers include a real-time scheduler for scheduling isochronous tasks, and supports at least one industry standard network file access protocol and one file access protocol for continuous media file access. The cached disk storage subsystem is responsive to video prefetch commands, and the data specified for a prefetch command for a process are retained in an allocated portion of the cache memory from the time that the cached disk storage subsystem has responded to the prefetch command to the time that the cached disk storage subsystem responds to a fetch command specifying the data for the process. The time between prefetching and fetching is selected based on available disk and cache resources. The video file server provides video-on-demand service by maintaining and dynamically allocating sliding windows of video data in the random access memories of the stream server computers.

摘要翻译： 视频文件服务器包括集成缓存的磁盘阵列存储子系统和将高速缓存的磁盘存储系统链接到数据网络以便传输视频数据流的多个流服务器计算机。 该视频文件服务器还包括控制器服务器，用于向客户端请求应用准入控制策略，并分配流服务器来服务客户机请求。 流服务器包括用于调度等时任务的实时调度器，并且支持至少一个工业标准网络文件访问协议和用于连续媒体文件访问的一个文件访问协议。 缓存的磁盘存储子系统响应于视频预取命令，并且对于进程的预取命令指定的数据从缓存的磁盘存储子系统对预取命令作出响应的时间保留在高速缓冲存储器的分配部分中 缓存磁盘存储子系统响应指定进程数据的fetch命令的时间。 基于可用的磁盘和缓存资源选择预取和提取之间的时间。 视频文件服务器通过维护和动态地分配流服务器计算机的随机存取存储器中的视频数据的滑动窗口来提供视频点播服务。